A) cobalt-60
B) cesium-137
C) strontium-90
D) none of these.
Correct Answer: C
Solution :
: The radioactive dust that falls to the earth after atomic explosion is called radioactive fallout. All nuclear explosions release 5% radioactive strontium-90 which causes pollution of air, water and soil. It replaces calcium in plants and animals. Sr-90, like iodine-131 can also enter the food chain and gets concentrated in human beings or animals where it replaces calcium from bones and causes bone cancer and tissue degeneration in most animals and man.
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