Any and every exposure to radiation carries some risk. Radiation can damage DNA and other molecules. Radiation is a known mutagen (causes DNA damage which may or may not lead to cancer) and a known carcinogen (causes DNA damage and enough associated steps to lead to cancer).However, before people fret too much about the risks of radiation, they should consider the concerns of Dr. Bruce Ames from U.C. Berkeley. Dr. Ames is the inventor of the Ames's Test - a famous test in science that is used to test chemicals for carcinogenicity (ability to cause cancer).Dr. Ames has published numerous research papers in many leading medical journals pointing out that (his words) "many common vitamin and mineral deficiencies cause the same kinds of damage to DNA that radiation does, but are of several orders of magnitude more important." Note: several orders of magnitude means thousands of times more important!!!!Most people live on processed junk food. Consequently they have low intakes of vitamin B12, Folic acid and vitamin B6; as well as low intakes of iron, zinc and selenium (minerals). These low intakes are common and cause the same kinds of DNA damage as radiation! This is one reason why in June of 2002 the Journal of the American Medical Association recommended regular vitamin supplementation for most Americans.Best wishes!