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Radon From Granite Causes Cancer
The seemingly contrived analogy that natural stone installed in your home is dangerous to your health has been brought up several times on the web and on a local Houston television news program recently.
It is interesting to note that the two main contributors to this non-profit organization are stone manufacturers. One of the participating manufacturers has a business executive on the board of directors of this particular organization.
On the surface it may be another “green progressive” advertising campaign, but it appears to be another slant on the ongoing battle of natural stone manufacturers against natural stone.
Keep in mind that granite, like most natural materials found in building materials, allows vapors to pass through them that may contain radon. Very small amounts of uranium are found in trace minerals such as biotite in some natural rocks. After all, if a large group of biotite is exposed, the first result is a radon reading. However, once the source is removed from the source of the granite or other natural rock containing the uranium-rich minerals in the soil, the transmission of radon vapors will be greatly reduced and subsequently reduced. Simply put, think of natural stone as a very dense sponge that allows water, air and even radon to pass through the stone. Once the stone is removed from the source of radon (soil), the filter stone is free of radon.
We support Radon testing but to say that natural stone is the main contributor seems ridiculous.
Here are some facts about Radon:
WHERE DO RADONS COME FROM?
“Radon comes from the natural radioactive decay of radium and uranium found in the soil beneath buildings. The amount of radon in the soil depends on the complex soil chemistry, which varies from one house to the next. Hundreds to thousands of pCi/L. The amount of radon from the ground that enters the house depends on the climate. days, soil porosity, soil moisture, and indoor smoke.”
HOW DO RADONS GET INTO THE HOME?
“The house acts like a big chimney. When the air in the house is warm, it rises to go out the upper floor windows and around the upper floor windows. This creates a small infiltration at the lowest level of the the house, it pulls the radon out of the ground and into the house. one inch above the floor. If you open a basement window one inch, you can feel the cold air from outside coming in. Radon does not enter the house. However, according to scientific studies it shows but only unsealed cracks or pin holes in the caulking need to be the same size as a 1/2” diameter hole to admit all the radon. and the joints will permanently seal the door that radon needs to enter the house. Radon levels may remain unchanged.
Fortunately, there are other very effective ways to keep radon in your home. Across the country, millions of people have been tested for radon. Some homes tested as high as 2,000-3,000 pCi/L; However, there has never been a house that could not lower the acceptable level. The difference between natural stone indexing is that the stone slabs are removed from a source and exposed to the atmosphere, radon is released in the same way as air conditioning in a ventilated house. the release of radon in the soil.
The level of radiation from granite products, which can be technically measured, is a small value of the threshold set for environmental protection. The truth of the matter is that granite is a safe product. It has been used for thousands of years and the relationship between granite and radon has been studied for many years. How to protect granite? A mathematical model has been developed that shows that a person can live in a house or building made entirely of granite, including sleeping on granite, for an entire year and still be within acceptable levels. guarantee.
Calculations show that, if the average countertop contains an average of 4 ppm uranium (parts per million), the concentration of radon that the countertop provides in the air at home will be 270,000 times higher. due to high levels of radon in the atmosphere. outside air. The maximum level of contact you will receive in a year if you sit on a counter top is about a quarter of the annual radiation from all sources. If you are only a few inches away from the granite (like when doing the dishes), the amount will be too low to measure.
Donald Langmuir, PhD, Professor Emeritus of Geochemistry, Colorado School of Mines, & President, Hydrochem Systems Corp.
“To show how ridiculous the concern of radon coming from natural stone, a typical granite countertop in our example will emit 7.4 x 10 -7 pCi / L. This corresponds to 2.7 / and ) x 10-8 radon radon in 0.85 x 10 -8 decays per second (dps) per year. In other words, the countertop produces less than one atom of radon in a year. it is exciting. I suggest that it is a good way to reduce our exposure to radon. In the outside air is to build an airtight house from the top of the granite! There are some characteristics of the stone that can increase radon emission efficiency, or in other words increases the radon emission from a stone’s weight. Properties that increase the internal or external diffusion of the rock with water or air, allowing the radon gas to avoid. The author of ‘Granite and Radon’ says that the heat or so, which includes rock porosity, fissuring and mylonitization, will increase radon emissions. This may be true, however, granite with such properties is too brittle to be used as a counter top, and too open to take polish, and therefore cannot be sold as a countertop – unless it is chemically impregnated. the rock pores. sealing. Such sealing will also eliminate any potential radon emission problems. “
In a recent study led by LL Chyi, Ph.D. and Professor of Geochemistry and Environmental Geology at The University of Akron, Akron, Ohio. Dr. Chyi reviewed 13 of the most popular granites used throughout the United States as determined by an industry-wide survey. Because of their popularity, these 13 granites are believed to represent up to 85% of the granite countertop market in recent years. The types of granite are as follows:
1. New Venetian Gold, Brazil; medium gneiss, beige-beige with dark red garnets
2. Uba Tuba, Brazil; Olive green, medium to dark gray granite
3. Santa Cecilia, Brazil; Pale yellow gray gneiss with pie-sized red garnets
4. Tropic Brown, Saudi Arabia; medium granite, brown
5. Absolute Black, India; black basalt
6. Tan Brown, India; Black-brown rock with large, amorphous, red-brown feldspar crystals
7. Giallo Ornamental, Brazil; Yellowish brown granite with reddish garnets
8. Crema Bordeaux, Brazil; Juparana Crema Bordeaux (Brunello). Pinkish to red granite with areas of quartz, alkali feldspar and abundant minerals.
9. Baltic Brown, Finland; brownish-black granite
10. Giallo Veneziano, Brazil; medium to dark, ochre-yellow to golden-brown, also pinkish, gneiss
11. Dakota Mahogany, USA; Medium to dark brown, red-brown granite
12. China Black, China, fine grained plutonic rock
13. Yellow Star, China, medium pink granite
The test method is designed to measure the amount of radon that each type of granite adds to a 2,000-square-foot, typically air-conditioned house with 8-foot ceilings. The results show that Crema Bordeaux (which is the most active in terms of radon emission) will bring a concentration of less than 0.28 pCi/L, or less than 7% of the level of 4.0 pCi/L recommended by EPA. This concentration of radon is much lower than that which can cause health problems. Tropic Brown and Baltic Brown, second and third in radon emissions based on tests by Dr. Chyi, was only 1% of this level. Other granites tested added unmeasurable radon to the home. Radon atoms in pore spaces and fractures are less of a concern in the case of granite countertops.
The test results of Dr. Chyi shows that the granite that is currently available in the US market is not very sensitive to the level of radon in the home. “Based on the test results and EPA standards, we can conclude that the most popular granite used for countertops is not dangerous for the home owner. reduce more” .
Daniel J. Steck, Ph.D. He also tested for radon and indoor granite, and that’s what he said.
“The average radionuclide sample of your construction sample is the same as other average samples of granite and other earth-derived building materials such as brick and soil. same;
There is no sample-to-sample variation in the concentrations of radon family radionuclides; The radon flux is slightly greater for the square versus the smaller sample. This indicates that the effective diffusion length is on the order of the opposite sample thickness, i.e. several centimeters. Therefore, material thicker than 5 cm (2″) is unlikely to yield more than the opposite sample.
Although we feel that health protection is the most important problem in our home, for an industry that tries to get money with “scary tactics” or under the auspices of “Eco friendly”. We urge customers not to be fooled by these scams.
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