Which of the following isotopes is most dangerous to Homo sapiens?
A
Phosphorus-32
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B
Strontium-90
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C
Caesium-137
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D
Iodine-131
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Solution
The correct option is A Phosphorus-32 The radioactive strontium – 90 is most dangerous because it gets fixed in bones and remains in bones leading to bone cancer. It emits high energy beta radiations. Phosphorus – 32 also emit high energy beta radiations but they cannot penetrate human skin. Cesium – 137 (a beta emitter) and iodine – 131 also pose danger to human health but not more than strontium 90.