Question

$\gamma$-rays are harmful radiations emitted by natural radioactive substances.
(a) Which are other radiations emitted from such substances.
(b) What is the unit of nuclear radiation?

Answer 1

(a) Other radiations emitted are: $\alpha$-rays and $\beta$-particles. X-ray is a form of electromagnetic radiation. Most X-rays have a wavelength ranging from $0.01$ to $10$ nanometers and energies in the range $100eV$ to $100keV$. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays.
(b) The unit of nuclear radiation is 'Roentgen'(R). Its quantity of radiation which produces is $1.6\times {10}^{12}$ pairs of ion in $1g$ of air. Nuclear radiation is defined as the energy particles or rays that are given off from a radioactive element, such as uranium, as it decays.