Which of the following isotopes is most dangerous to human beings?
Phosphorus-32
Strontium-90
Caesium-137
Iodine-131
As we have already discussed in Radioactive waste -
Certain elements continuously disintegrate by emitting ionizing radiations.
- wherein
These elements are called radioactive isotopes. Ecologically important radioactive elements are Strontium-90, Argon-41, Iodin-131, Cobalt-60, Cesium – 137, Plutonium – 238, etc. Among these Sr-90' is the most dangerous radioactive pollutant because it is produced by nuclear fission.
Hence, the correct optin is (b).