All types of radioactive decay can be detected ... beta radiation is stopped by several metres of air or a thin sheet of aluminium; beta decay:\(_{X}^{A}\textrm{X}\rightarrow_{Z+1}^{ ...

JON CHASE:'The decay of these unstable elements is known as ionising radiation. 'There are three main types - alpha, beta or gamma. JON CHASE:'Gamma radiation is pure energy, 'but alpha and beta ...