Explanation:

Strontium-90 is close to calcium and when it enters our body it gets fixed with bone mass. It emits only beta rays with a short range, which makes it harmful. It is often found in seafood that has shell bodies. Iodine 131 if swallowed is absorbed into the bloodstream in the gastrointestinal tract. It is concentrated from the blood by the thyroid gland, where it begins destroying the gland’s cells. Cesium-137 when inhaled allows the radioactive material to disturb the soft tissue. Exposure of these tissues to beta particles and gamma radiations increases the risk of cancer.