The thicker the substance, the more the radiation is absorbed. Alpha, beta and gamma radiations penetrate materials in different ways. Alpha radiation is the least penetrating. It can be stopped ...

It does this by emitting a high energy electromagnetic wave called a gamma ray. Gamma radiation does not consist of particles but as short wavelength, high energy electromagnetic radiation emitted ...

Radiation treatments may offer a means of reducing this problem of penetration, especially in large built-in timbers, such as oak infested by the death-watch beetle, but before their possible ...