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Human beings are exposed to two sources of radiation in the environment: natural and man-made. Natural sources include radioactive radon, radioisotopes with a long half-life, such as potassium in the body, cosmic rays (energetic γ-rays and particles from the sun and interstellar space), and some rocks. Various sources of artificial radiation include medical X-rays, nuclear medicine for cancer treatment,...
Tobacco was estimated to account over 4 million annual deaths in 1998 and deaths attributable to tobacco usage will rise to 8.4 million in 2020 (http://tobacco.who.int/en/advocacy/wntdzoola.html.) In Turkey, 74% of the males and 29% of the females are smoking, and each year, 150,000 deaths are associated with cigaret smoking. There are 4700 chemical compounds in cigaret smoke, including 43 carcinogens...
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