||Radioactivity in Common Products
Around the House
Many household products contain a small amount of radioactivity. Examples include gas lantern mantles, smoke detectors, dentures, camera lenses, and anti-static brushes. The radioactivity is added to
the products either specifically to make them work, or as a result of using compounds of elements like thorium and uranium in producing them. The amount of radiation the products gives off is not considered significant. But with today’s sensitive equipment, it can be detected.
Lanterns: In a New Light
About 20 million gas lantern mantles are used by campers each year in the United States. Under today’s standards, the amount of natural radioactivity found in a lantern mantle would require precautions in handling it at many Government or industry sites. The radioactivity present would contaminate 15 pounds of dirt to above allowable levels. This is because the average mantle contains l/3 of a gram of thorium oxide, which has a specific activity (a measure of radioactivity)
of approximately 100,000 picocuries per gram. The approximately 35,000
picocuries of radioactivity in the mantle would, if thrown onto the ground, be considered low-level radioactive contamination.
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