Question

External exposure to which of the following radiations will be least harmful?

• A. Alpha
• B. Beta
• C. Gamma
• D. All

Answer 1

The correct option is A

Alpha

The explanation for the correct option

a) Alpha particles cannot penetrate into the skin as they have the least penetration power.

The explanation for the incorrect option

b) Beta rays are a more penetrating power than alpha and can damage our cells.

c) gamma rays are a more penetrating power than alpha and can damage our cells.

d) as options b and c are incorrect this option cannot be correct.

Hence the correct option is (a); alpha rays are the least harmful.