Which Granite Emits The Most Radon

Some granite countertops have been found to give off trace amounts of radon and reporters cited a few kitchens with radon levels as high as 25 times the epa s safety limit of 4 picocuries per liter of.

Which granite emits the most radon.

The reports were about granite countertops that contain radium which can emit radon a radioactive gas that can cause lung cancer. All types of granite contain various amounts of uranium an element that produces radon gas. Moreover kitchens bathrooms. While natural rocks such as granite may emit radiation and radon gas the levels attributable to such sources are not typically high.

To reduce the radon risk you should first test the air in your home to determine the radon level. Because granite isn t very porous and large quantities of it aren t typically used in most single family homes the radon isn t likely to escape in a significant enough quantity to potentially cause problems says brian hanson a specialist with the national radon program services at kansas state university. However any radiation present would decrease quickly with increasing distance. In fact in a recent study by consumer reports none of the granite samples tested were found to emit any radon at all.

Radon released from granite building materials can be released over the lifetime of use but typically will be diluted by ventilation. It isn t a surprise that granite emits radiation. Granites that emit the most radon are the ones that contain the most uranium. There are many do it yourself radon test kits available through retail outlets and on line starting at about 25.

If your stone surface emits a small amount of radon as happens in most cases it will generally be insignificant when diluted with the quantity of air in your entire home. Other building materials may emit radon such as soapstone brick or concrete but as with granite these materials are unlikely to increase radon levels in the home to levels above those already present in nature. The amount of radon in the air is measured in picocuries per liter of air. The popularity and demand for granite countertops has grown in the last decade as have the types of granite available.

The question is whether they do so at levels that can impact cancer risk. So do other items in our households. One eighth the average radon gas concentration in u s. Experts agree that most granite countertops emit some radon and even other types of radiation.

The amount of radiation emitted from granite can vary. Radon can be a carcinogen and is therefore a health concern especially in poorly ventilated indoor spaces.