Home Safety Tests
To Consider
Mold & Mildew
Water Pollution
Air Pollution
Air Duct Cleaning
Asbestos Hazards
Carbon Monoxide
Radon Gas
Lead Poisoning
About Us
Contact Us
Home Page

Is A Home Radon Free?

Airborne radon and its decay products is known to cause lung cancer in humans. Exposure to radon in drinking water has been accused of increasing the incidence of gastrointestinal diseases, including stomach and other cancers. Radon gas has been found in varying amounts in every state in the USA, killing up to 30,000 people each year from lung cancer.

Information about Radon:

What Is Radon?
A Short History of Radon
What Does Radon Look Like And Where Is It Found?
The Radioactive Series and Different Types of Radiation
How Does Radon Enter A Building?
How Does Radon Enter the Body?
Why Is Radon Dangerous?
Do Legal Limits Exist?
Who Is Most At Risk?
When Should I Be Most Concerned About Radon?
What Factors Can Affect Test Results?
A Brief Explanation of the Units of Measurement
What Should I Do If Radon Is In My Home?
What Can I Do Myself?
Some Facts About the Radon Abatement Industry
Recent Controversies About Radon
Types of Radiation
Is Gamma Radiation Dangerous?
What Should I Do If There Are Radionuclides Which Emit Gamma Radiation In My Home?


Test screening performed by Home Safety Inspections will help you determine whether the air in your home contains radon, a radioactive gas normally produced in nature. Since radon is an EPA listed “Group A” carcinogen, proven to cause cancer in humans, and believed to be the second-leading cause of lung cancer in America today, it is important for you to understand the substance you are dealing with: how it can enter your home, how it can be measured, what levels are considered unhealthy, and who is most at risk from exposure. This guide also discusses other subjects which may be of interest, such as various methods used to abate and mitigate (eliminate or reduce) radon levels in schools and homes, and how to find organizations to which you might want to turn if you have additional questions or concerns.

What Is Radon?
Radon is a radioactive gas. It is invisible, tasteless, odorless and chemically inert. Radon is produced during the breakdown (radioactive decay) of radium, which can be found in some soils, rocks and bedrocks. The breakdown of radium, and subsequent release of radon and radon decay products such as bismuth, polonium and lead, is an example of “natural” radioactivity. (Artificial radioactivity occurs when products are released and elements changed into other elements because they are being bombarded with electrons, protons, or neutrons.) Radon gas may be found in indoor or outdoor air, and in drinking water or other water. According to the EPA, radon may be in as many as one in five American homes, Since the biological effects caused by radon can be the same as the biological effects caused by other forms of radiation, such as the radiation from nuclear power plants, it is important to understand and limit your exposure. However, since radon gas is so prevalent in certain areas, limiting ones exposure can be difficult. According to “The Harvard Health Letter” of January 1991, as much as 55% of the total human exposure of ionizing radiation may come from radon. Exposure to airborne radon and its decay products is known to cause lung cancer in humans. Exposure to radon in drinking water has been accused of increasing the incidence of gastrointestinal diseases, including stomach and other cancers. Radon may enter a home's air supply from the ground below, or may enter a home's air supply from the home's water. According to radon scientists such as W.A. Mills, up to 5,000 deaths a year can be attributed to radon in drinking water from private wells. And, according to a report presented at the EPA international radon symposium held in Atlanta, Georgia in February 1990, (Schmidt A, et al "EPA's approach to assessment of radon risk” ), there are between 21,000 and 40,000 deaths a year that can be attributed to radon. The Federal Register (Volume 56 No.138; July 18,1991) indicates that radon in homes account for (as many as) 40,000 lung cancer deaths annually. That's almost one person every 20 minutes. Based on these figures: · Radon kills more Americans each year than handguns (handgun deaths = 17,000 according to Porter Consultants, Inc., of Ardmor, Pa.) · Radon kills more Americans each year than drunk driving (drunk driving related deaths = 25,000 in 1989 according to the Mothers Against Drunk Driving). · Radon killed more Americans than AIDS. (Aids related deaths in 1989 = 19,161 according to the Center of Disease Control (CDC), Atlanta, Ga.)

What can Radon do to you?

Radon gas contains radioactive particles which get trapped in your lungs every time you take a breath. As these particles break down, they release bursts of radiation that damage or destroy lung tissue and cause lung cancer, and long-term exposure may even cause death.

Do you have any of the following in your home?

  • Cinder-block, brick or rock wall
  • Exposed soil in the basement or foundation
  • Cracks in the basement wall or foundation
  • An open sump pump hole or floor drain
  • Spaces between walls and floors
  • Exposed pipes or loose pipe fittings
If you answered YES to any of the above questions, then you could be breathing in this deadly radioactive gas.

What Are The Risks?

It is estimated that radon kills between 5,000 and 30,000 people each year. Nearly 1 in 15 homes are estimated to have elevated levels of radon. Radon gas is the #1 cause of lung cancer in non-smokers. Radon can show up in any home or office. You may have radon in your home or office even if your neighbor does not. The risk of developing lung cancer from Radon exposure can increase depending on:
1.       the level of radon in your home or office;
the amount of time you have spent exposed to radon;

whether you are a smoker or have ever been exposed to tobacco smoke.
Smokers Beware!

Cigarette smokers who have radon concentrations of 10pCi/L or higher increase their chance of developing lung cancer by as much as 18 times or 1800%.

How Does Radon Get Into A Home Or Office?

The greatest concentration of radon is usually found in the lowest level of homes or offices. This is because radon is found in the soil and rocks beneath the foundation. If you have dirt floors in the basement, cracks in the foundation, or openings from a sump pump hole or drain, radon is likely to build up quicker and in higher concentrations. Radon can also enter your home or office through your water supply (i.e. shower, dishwasher, washing machine, etc.). If your home or office uses well water, we suggest testing.

Protection...Testing Is The First Line Of Defense!

To find out if radon gas is a problem in a home or office, a radon test conducted!  Our Radon Gas Testing is accurate and reliable for checking the level of radon gas in a home or office. Our test employs side-by-side testing in order to get the most accurate and reliable results.

Radon Is Measured In Picocuries Per Liter (pCi/L)
An acceptable level of radon is 4(pCi/L) or less. If the average of your last test results were higher than 4(pCi/L) it would be recommended that you take some action to reduce the radon level in your home or office.

We recommend that you conduct a radon test every year. Annual testing is the best way to determine whether or not your home or office has the potential for a radon problem.

If Test Results Are High?
Unfortunately, if the initial test results are very high, costs to control your Radon probel could run between $500-$2,500 depending on the seriousness of your problem. We recommend that you start by doing the following:
  • Seal or caulk areas of entry such as cracks, holes and openings;
  • Keep vents to crawl spaces open;
  • Minimize time spent in low areas such as your basement;
  • Increase the circulation of outside air into your home or office;
  • Discourage cigarette smoking in your home or office.

Radon Level

Smokers likely to get lung cancer out of 1,000 exposed to radon over a lifetime

Non-smokers likely to get lung cancer out of 1,000 exposed to radon over a lifetime

20 pCl/L



10 pCl/L



8 pCl/L



4 pCl/L



2 pCl/L



1.3 pCl/L


less than 1

0.4 pCl/L


less than 1


In the News
The U.S. Surgeon General, Richard Carmona, Issues New National Health Advisory on Radon On January 13, 2005 the Surgeon General of the United States issued a Health Advisory warning Americans about the health risk from exposure to radon in indoor air.

The Nation’s Chief Physician urged Americans to test their homes to find out how much radon they might be breathing. Dr. Carmona also stressed the need to remedy the problem as soon as possible when the radon level is 4 pCi/L or more. Dr. Carmona noted that more than 20,000 Americans die of radon-related lung cancer each year. You can view the EPA news release and the Surgeon General's press release here.

What the Consumer Federation
Of America says about Radon

A Short History Of Radon
Radon has been present in the earth's crust for billions of years. It is produced by the natural disintegration of radium, which is a lustrous, white radioactive element produced by the decay of uranium, and sometimes found in rock or bedrock. Before radon was discovered to be hazardous to human health, homes in the American West were sometimes built with materials contaminated by the radium from uranium mines. In some rare cases, homes elsewhere were also built from radioactive materials. For example, some homes built in the 1920s in Pennsylvania were found to contain radon-contaminated sand in their plaster, stucco and concrete, The contaminated sand had been furnished free to contractors by a factory which extracted radium 226 from ore in order to treat cancer patients. Clock faces have also sometimes been painted with radium so that people could see the numbers glow in the dark. Radium is still sometimes used to treat cancer, and it is also still occasionally used in luminous paints and varnishes. Radon gas was discovered to be a product of radium in 1902. Marie Curie won the Nobel Prize in 1911 for her research isolating metallic radium. According to Parade Magazine, November 4, 1990, a famous story about radon concerns a house in Boyertown. PA lived in, in 1984, by the Stanley Watras family. At that time, Mr. Watras was working as a construction engineer at the Limerick Nuclear Power Generating Station in Pottstown, Pa. One day he visited the plant's radiation-detection section, and when he stepped into it, his radiation levels were so high he blew out the monitor. A survey showed that every part of his body was contaminated by radiation. This was shocking, especially as he didn't work directly with radiation. He began to wonder whether he'd been exposed to radiation at home. When it became clear that his home was, in fact, contaminated by radon gas, the family moved to a motel, and then rented another house for almost a year. Meanwhile, the Watras house was found to have 4,400 picocuries of radon per liter (pCi/L) of air in the cellar, 3,200 pCi/L in the living room, and about 1,800 pCi/L in each bedroom. (To put these numbers into context, having 4 picocuries of radon per liter of your indoor air is roughly equivalent to receiving 200 chest x-rays per year.) According to Parade Magazine, November 4, 1990, the Philadelphia Electric Co. took on the house as an experiment. Contractors sealed and caulked cracks in the basement, and laid air pipes under the concrete foundation of the house, and on top of the soil, to draw radon off. Then they used fans to further reduce levels of radon gas. These measures reduced the average radon level in the house to 4 picocuries. Stanley Watras began working in the radon mitigation field, and he and his family returned to their original home.

What Does Radon Look Like And Where Is It Found?
You can't see, smell or taste radon, whether in water or air. In outdoor air, radon is generally diluted until it is not much of a threat. Inside, radon can accumulate to unhealthy levels. The amount of radon that accumulates depends on the amount of radon being released by materials below the building, the kind of construction materials and ventilation systems used in the building, as well as the temperature: a heated building in a cold climate may draw in more radon than a building in a warm climate. Since most radon enters the air from soil or rock, the lower rooms in a building are usually at more risk than the rooms higher up. It is also possible for one home to be exposed to high levels of radon while the home directly next door is not. Radon in Water: Some of the first research to measure radon in water was conducted by the Cambridge University water system in 1902. Today, research continues with groundwater in the U.S. In the granite and pegmatite (a type of rock) areas of Maine and New Hampshire, as much as 1,300,000 picocuries per liter of water has been measured, according to studies published in 1976 in the "Proceedings of the Health Physics Society". Usually, however, water contains less radon than this. Generally speaking, certain geographic regions contain higher levels of radon than others. Based upon EPA research (National Inorganics and Radionuclides Survey), there is a correlation between radon concentrations in drinking water (above 1,000 pCi/L) and the following geologic formations: New England mountain ranges, the Adirondack mountains, the Appalachians, the Ozark Plateau, the Black Hills, the Wasatch mountains, Edwards Plateau, the Sierra Nevada mountain range, the Salmon River mountains and Blue mountains.

Geographically, the following areas are considered to be at risk (radon concentrations in drinking water above 500 pCi/L):
  • all New England states
  • Alabama (Northern, Alabama)
  • Arizona (Southern Arizona)
  • California
  • Colorado (Central Colorado)
  • Florida (Tampa area)
  • Georgia (Northern Georgia)
  • Iowa
  • Idaho
  • Maryland
  • Minnesota
  • Missouri (Southern Missouri)
  • North Carolina
  • North Dakota
  • New Jersey (Northern New Jersey)
  • New Mexico
  • Nevada
  • New York (except New York City and Long Island)
  • Oregon (Portland & Salem areas)
  • Pennsylvania (Eastern Pennsylvania)
  • South Carolina
  • South Dakota
  • Tennessee
  • Texas (Austin & Amarillo areas)
  • Utah
  • Virginia
  • Washington (Northeast Washington)
  • Wisconsin
  • West Virginia (Eastern West Virginia)
  • Wyoming (Eastern Wyoming)
Radon can be released from radon-contaminated water during showers, or during the operation of a dishwasher or washing machine. More radon can be released as the temperature increases, and the surface area of the water exposed to air increases. Water must contain a high level of radon, however, to increase the overall level of indoor airborne radon gas. Generally, 10,000 picocuries per liter of radon in incoming household water is considered to be equivalent to 1 picocurie per liter of radon in air. Radon in Air: It was once thought that the only people exposed to high levels of radon were those who lived in homes over the Reading Prong (the geological formation containing high levels of uranium under Northern NJ, South Eastern NY. and Eastern Pa.). It is now known that substantial levels may be found in homes elsewhere.

The Radioactive Series and Different Types Of Radiation
Radon can be found in the periodic table as radon(222), a gas which is a naturally occurring radioactive product in the uranium(238) decay series (the numbers in parentheses refer to the atomic weight of the element). Atoms of radioactive elements are not stable, and they disintegrate, or decay, at a specific and constant rate that cannot be changed by any known means. In the process of this disintegration, elements of “high” atomic weights eventually turn into elements of “lower” atomic weights. The result of this disintegration process is a non-radioactive element. Radon maybe found emanating from industrial wastes containing radium such as the by-products of uranium or phosphate mining. Uranium is a natural element and may be found in soil, rock or bedrock containing granite, carnotite, shales, phosphate and pitchblende. Radon decay products release further radiation. These decays products are known as radon daughters or radon progeny. Radioactive polonium(218), lead(214), bismuth(214), and polonium(214), lead(210), bismuth(210), and polonium(210) are produced when radon(222) decays. Radon(222) finally becomes stable when it reaches lead(206).

How Does Radon Enter A Building?
Most airborne radon is released into building from the soil or rock beneath. Radon from soil or rock enters the building through cracks and holes in a building's foundation, then can move freely through open areas. Most radon in water can be released into buildings from contaminated groundwater (such as from a private well) used in showers, dishwashers, clothes washers, and other types of appliances. Generally, the amount of radon released from water depends on how much radon was initially in the water, the temperature of the water (higher temperatures release more), and the amount of water surface exposed to air (the more surface exposed, the more radon is released.) Although the alpha particles in radon can he stopped by a wall, a few sheets of paper or a person's skin, building basements or foundations are often not a completely effective barrier since they often contain cracks or holes. Pressure differentials between a building interior and exterior can also draw in radon gas.

How Does Radon Enter The Body?
It is generally believed that skin acts as a barrier to radon, so, the only way that radon can enter into a person's body is if it is inhaled (breathed in) or ingested (when water is consumed). A person's lungs are particularly vulnerable to the effects of radon. If ingested, radon goes to the gastrointestinal (GI) tract first, then to the liver and parts of the circulatory (blood) system. From the circulatory system radon enters the lungs and body tissues.

Why Is Radon Dangerous?
The known health hazard associated with exposure to radon is an increased risk of lung cancer. Exposure to radon and its decay products is the second-leading cause of lung cancer in America after cigarette smoking. According to Dr. L. Grodzins of the Massachusetts Institute of Technology, in a document published in 1987 for Beckman Instruments, Inc., the decay of radon gives off more radiation than the amount an average nuclear power plant employee is exposed to. Early risk assessments have been more concerned about the radon in air than the radon in water. In fact, the only danger from radon in drinking water was thought to be that this radon could and did evaporate into the air. Today, more is known about the effects of radon ingested in drinking water. According to studies performed at Massachusetts General Hospital as part of the EPA's effort to regulate radon, it is now known that ingested (radon in drinking water) is first present for a significant length of time in the stomach, and then moves, in smaller quantities, to the small intestine, upper large intestine, lower large intestine, and from there to the portal blood, where it is rapidly carried to the liver, and to airspaces in the lung tissue. Radon may also reach general body tissue, where it is distributed uniformly. Although the lung tissue generally receives less of a dosage from ingested radon than it does from inhaled radon, we already know that lung cancer is a proven effect of radon exposure, so it is possible that radon in water contributes to lung cancer rates as well. Studies indicate that the stomach receives the greatest dose of radiation from ingested radon. The relationship between radon exposure and stomach and intestinal cancer is highly uncertain, and a better understanding of the actual risk factors involved awaits further epidemiological studies. It has been suggested that the alpha particles released by the nucleus of radon atoms and radon progeny as they decay, are responsible for most of the bodily damage caused by radon. When alpha particles are inhaled they may attach to lung tissue. Alpha particles can enter the lungs freely in the form of radon gas, or as a radon decay product attached to dust, smoke, lint or biological aerosols. While in the lung tissue, the energy emitted by the alpha particles has the potential to damage DNA molecules. The damaged DNA molecules may repair themselves, may die, or may replicate more damaged DNA molecules. If damaged cells are replicated, the danger of lung cancer arises. Exposure to radon does not always cause lung cancer, but it does increase a person's risk. Research has shown that lung cancer rates among miners of uranium, iron, and other hard rock minerals, who have worked within comparatively high quantities of radon, are higher than the lung cancer rates of underground miners of coal and gold, who have worked with comparatively low quantities of radon. This research also shows that the higher the radon concentrations were, and the longer the exposure, the more serious the risk of lung cancer grew. The lung cancers usually appeared at least 5 to 10 years after exposure. Studies of animals have shown that dogs, mice and rats, whose lungs are similar to humans, are also at increased risk of contracting lung cancer from exposure to radon and radon decay products.

Do Legal Limits Exist?
Radon in Water: As of the time of this writing there is no official U.S. limit on radon in water. By the authority granted to the EPA under the Safe Drinking Water Act (SDWA), the EPA has proposed a Maximum Containment Level (MCL) of 300 picocuries of radon per liter of water. Under the SDWA, each state would be required to monitor and enforce this regulation among public water supplies in their state. The SDWA does not require compliance among private wells or community water supplies (those serving less than 25 households annually). This proposed MCL has been promulgated and published in the Federal Register (July 1991) to become effective in April 1993. That limit may not, however, become effective, as proposed limits are subject to debate and legislative processes. Radon in Air: There is no federal limit on the amount of indoor airborne radon, as the EPA does not have the authority to regulate indoor residential air. The EPA has however established advisories and recommended action levels. Please refer to the section in this guide titled: "When Should I be Most Concerned About Radon".

Who Is At Most Risk?
Radon can cause lung cancer in any person, but it is believed that the risks increase if a person is exposed to radon for a longer period of time, and/or if they are exposed to greater concentrations. It is also believed that the combination of cigarette smoking and exposure to radon results in a synergistic (significantly greater because of the combination) risk than would result from either factor alone. Most of the individuals who get lung cancers attributable to radon have been smokers. According to a study conducted by the EPA, a non-smoking person exposed to between 10 and 20 picocuries of radon has a risk of lung cancer comparable to someone who smokes a pack of cigarettes a day. Despite the fact that a home may feel safe, it is possible for radon concentrations in that home to exceed the concentrations in an underground mine. Some American homes have radon levels so high that the people in the homes receive as large a dose of radiation as did the people living in the vicinity of the Chernobyl Nuclear Power plant in 1986, the year of the disaster (Kerr, R.A. Indoor radon: the deadliest pollutant. Science 240:606-608,1989). Radon will not irritate your eyes, nose or skin, nor does it have any immediate effect on your breathing. Symptoms usually appear five to twenty years after initial exposure. These symptoms can include coughing up blood, shortness of breath, or unexplained weight loss. See your physician if you develop any of these symptoms.

When Should I Be Most Concerned About Radon?
You should always he concerned about the risk of radon gas in your home, or in schools or other places; but you should be especially concerned if: You live in one of the following states: Colorado; Connecticut; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Maine; Maryland; Massachusetts; Minnesota; Missouri; Montana; Nebraska; New Hampshire; New jersey; New Mexico; New York; North Dakota; Ohio; Pennsylvania; Rhode Island; South Dakota; Tennessee; Utah; Vermont; Virginia; West Virginia; Wisconsin; or, Wyoming.

What Factors Can Affect Test Results?
Many factors can affect radon measurement, including a building's ventilation, how often its windows are open, how and where the radon is entering the building, and the temperature and humidity. Because of these factors, it is possible for the same home to have different radon levels at different times. It is important when conducting any radon test that you carefully follow instructions enclosed with the test.

A Brief Explanation of the Units Of Measurement
Radon is measured in picocuries per liter and written as (pCi/L). One picocurie is one-trillionth of 37 billion disintegrations per second. One curie, named for Marie Curie, the discoverer of metallic radium, is the amount of radiation given off by one gram of radium. Radon decay products (RDPs) such as polonium(218), lead(214), bismuth(214), and polonium(214), lead(210), bismuth(210), polonium(210) are measured in working levels (WL). A working level is the amount of RDP which normally results when the decay products are in equilibrium (maximum concentration) with 100 picocuries of radon in the air. RDPs are difficult to measure in a house though, because among other problems, RDPs have a static charge and tend to plate out (stick) to walls, furniture, clothing, dust, smoke, and other objects and substances. One of the problems with understanding the amount of risk due to a specific radon level measurement is that the risk statistics are based on an average lifetime (70 years) spent in an exposed area, even though the average American moves every 7 years, and is thus exposed to many different radon levels.

What Should I Do if I Find Radon In My Home?
The first thing you should do is determine whether the level of radon in your home is acceptable to you. Radiation always presents an element of health risk, but higher levels are, of course, more dangerous than lower ones. You can compare the reported level against the guidelines that have been set by the EPA. Various groups have also independently established levels that differ from the EPA. The American Society of Heating, Refrigeration, and Air Conditioning Engineers has set the lowest level, which suggests a radon action level of 2 picocuries per liter or less for commercial buildings and residences. The EPA has adopted a 4 picocuries per liter of air action level. The U.S. Mine Safety and Health Administration, on the other hand, suggests an action level of 16 picocuries per liter (while miners are in underground mines). If you feel you have high levels of radon in your home, we recommend you increase the ventilation, limit the time anyone spends in the areas with highest concentrations, and consider other abatement mitigation methods. You should also consider contacting your State's radiation control program, regional EPA office, or other qualified professionals to determine what action might be taken to reduce your exposure.

What Can I Do Myself?
Some relatively easy and minor mitigation techniques that can be done by a non-professional are: · Increase the ventilation in your home (open windows and doors whenever possible.) · Limit the amount of time anyone spends in the areas of your home which have the greatest radon concentration (for example, the basement.) · If your home has a crawl space, keep the crawl space vents on all sides of the house fully open all year. · Stop smoking and discourage smoking in your home.

Some Facts About The Radon Abatement Industry
Radon abatement services exist in both the public and private sectors, nationwide. Many organizations and firms are capable of providing radon measurement, or mitigation and abatement services for existing structures, or preventative services for newly-constructed structures. The EPA has worked with builders, building inspectors, federal, state, and local code authorities, as well as with school officials, to develop these services further. The field of radon abatement is still relatively new and not all abatement contractors have equivalent skills. It is important to carefully evaluate the skills and competence of the individuals you select. Before hiring an abatement or mitigation firm. · Evaluate them properly, check with other homeowners in your area who have hired them, call your local Better Business Bureau or Chamber of Commerce. · Make sure the contractor has a permanent business location and a good reputation in the community. · Be cautious of high pressure tactics, also be cautious of any contractors who require a large down payment in cash. · Check that the contractor has the proper insurance and liability to protect you in case of an accident. · Ask for documentation as to the contractor's training and certification. · If at all possible, obtain more than one estimate. Estimates are usually free of charge. Be sure each estimate (and the subsequent contract) describes all the work to be done in detail, including quantity, quality, types, brands, and models of materials and products. Be sure the written version of the contract includes any oral promises that have been made to you. The contract should include the contractors’ warranty. Be sure the contract also specifies who will be responsible for acquiring and paying for building code permits and licenses. It is also a good idea to include a provision for testing for radon levels before and after the project. just to confirm that the desired amount of mitigation has taken place. · After having work performed, get post-mitigation testing. Radon levels should he significantly decreased. It is best if these measurements test the radon gas concentration in picocuries per liter of air.

Recent Controversies About Radon The EPA, The U.S. Surgeon General, NIOSH, The American Lung Association, The American Cancer Society, The World Health Organization, The Consumers Union, The National Research Council's Committee on the Biological Effects of Ionizing Radiation and The American Medical Association all agree that radon in home and work places is dangerous. The Health Physics Society, however, claim that radon is not a significant health risk when compared directly to smoking. Further controversy exists on the exact numbers with which to measure risk. For example, using the same studies, the National Council of Radiation Protection (NCRP) estimated that about 7 out of every 1,000 people would die from lung cancer attributable to radon and RDP exposure (over a 70 year period) at a level of .02 WL (4 pCi/L); while the EPA estimates that between 13 to 50 people out of 1,000 people would die at that level. Controversy even exists on what constitutes safe levels of exposure to radon. Different groups have made different value judgments as to what levels of risk are acceptable. Research on the health hazards of radon continue. Some scientists say that external exposure to radon and the possibility of swallowing radon presents no danger because alpha particles have little penetrating power and may be easily stopped by a barrier as thin as skin, or by the liquids in the gastrointestinal tract. Others are privately skeptical. The only thing that has been absolutely proven is that radon is a “Group A” carcinogen, which means that there are human data proving it causes lung cancer in people. Still, less dangerous carcinogens are prohibited and strictly controlled, while radon, which is ubiquitous (very common) to some areas, is hardly regulated. The dangers of radon exposure are greater, statistically, than the dangers of typical exposures to asbestos, pesticides such as ethylene dibromide, and air pollutants such as benzene.

Types Of Radiation Uranium and radium emit radiation in the form of alpha, beta and gamma rays, as do the following other radioactive elements: actinium, polonium, plutonium and thorium, power plain. Alpha Radiation: is considered the most dangerous product associated with radon gas. As the atom decays, its nucleus releases alpha particles which have a positive charge, are somewhat affected by magnetic fields, and have very little penetrating power. Because of this lack of penetrating power, an inch of air, or a few sheets of paper, or a person’s skin may stop alpha particles. Alpha particles, which are the mass of two protons and two neutrons, disperse their energy quickly, and can damage molecules as they pass through them. A hazard exists if a person breathes in these particles, or somehow swallows them, such as in drinking water. Alpha radiation can also he found in nuclear power plants. Beta Radiation: Beta particles, which are also released from the nucleus of a radioactive atom, have a negative charge, and a mass equal to that of an electron. Beta radiation is faster than alpha radiation, and can be drastically affected by the presence of a magnetic field. Beta particles also have more penetrating power than alpha particles, and can penetrate about .5 centimeters into a person’s body. Gamma Radiation: Gamma rays have no mass, no charge, and a penetrating power weaker than that of either alpha or beta radiation. Gamma rays are not affected by magnetic fields, and can pass right though a human body. They are emitted as photons, can travel at about the speed of light, and behave very much like x-rays. Gamma radiation can also be found in nuclear power plants. Gamma rays are spontaneously, but not always, emitted from decaying atoms.

Is Gamma Radiation Dangerous?
The National Council of Radiation Protection (NCRP) has set federal guidelines for residential exposure to radiation. This limit is 0.058 mR/hr, which can also be expressed as 0.000058 R/hr. This guideline covers any type of radiation, man-made or natural. It has not been clearly established that exposures above this level lead to increased mortality (death rates), but many medical professionals believe that any exposure to radiation leads to an increased incidence (chance) of cancer.

What Should I Do If There Are Radionuclides Which Emit Gamma Radiation In My Home?
Since gamma radiation is associated with radioactive elements such as uranium, radium and radon, reducing the level of radon in your home might also reduce the level of gamma radiation. Gamma radiation is emitted from a wide spectrum of radioisotopes, and a reduction in the level of one may reduce your overall gamma radiation exposure to a more acceptable level.


The Professional Radon Gas Test Products we use utilize the most advanced liquid scintillation, short–term detectors, which contain silica gel desiccants (patented) necessary to remove all moisture in order to make your test results accurate and reliable. Testing involves us placing radon detectors in the lowest level of your home or office for a period of 96 hours to allow time for the detectors to absorb enough radon to be analyzed according to EPA standards.   We then Seal the detectors and send them to a Laboratory for analysis.

Professional laboratory test results are mailed to the company/individual requestiung the test, indicating the exact radon level in the tested area. For real estate transactions, an express service is also available.

Once we have tested your home or office, you can then make any changes necessary to protect you and your family from further exposure to radon.


Radon gas has been found in varying amounts in every state in the U.S. killing up to 30,000 people each year from lung cancer.

Our Professional Radon Gas Test
offers you a professional radon analysis of your home or office. If you ever conducted a radon test and your results were above 4 pci/L, we strongly recommend that you immediately do a repeat test for result confirmation before you take any further action. Also, if your home or office uses well water, this could be the source of your radon problem. We suggest testing your well water.

You will receive your results within one week from the date we remove your detectors.

Over 17,000 homeowners with well water are affected by water-borne radon according to the U.S. EPA. Radon is the 2nd leading cause of lung cancer and is emitted in homes from well water during showering, cleaning, brushing your teeth, and doing laundry.

Our Professional Radon Gas Test
utilizes patented liquid scintillation technology that offers EPA proficiency results, within 2 weeks. Lab fees are included in our pricing.

Over 17,000 Homeowners are affected by water borne radon according to the U.S. EPA.

Our Radon Test for well water

  • is low cost and effective
  • utilizes patented liquid scintillation technology
  • offers EPA proficiency results

Express service for real estate transactions is available.

Info about our lab reports.

Certified Mold Inspectors
Alamo, CA (925) 946-2500
License # 020952

Copyright © 2004-2005
Home Safety Inspections
All Rights Reserved.

Any written materials contained on this site which bear the name(s)
of any other organizationare the exclusive property of that organization(s).