If by mistake some radioactive substance get into human body, than from the point of view radiation damage, the most harmful will be one that emits -

Options

A. `gamma`-rays
B. Neutrons
C. `beta`-rays
D. `alpha`-rays

Answer

A

Explanation

`gamma`- rays has highest frequency range and hence highest penetrating power. These are able to travel many feet in air and many inches in human tissue. These readily penetrate most materials and are sometimes called "penetrating" radiation.