Which of the following is a naturally occuring radioactive substance in the body in small quantities?
Correct Answer: Potassium 40
Description: Sources of radiation exposure are: Natural sources and Manmade sources. The natural sources include cosmic rays, environmental (terrestrial and atmospheric) radiation, internal radiation (Potassium - 40 & Carbon -14) Man-made Radiation: Medical and dental: X rays, radioisotopes Occupational exposure Nuclear Misc: TV, Radio-active dial watches, Luminous markers Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 803
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Social & Preventive Medicine
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