Beta particle

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Alfa beta gamma radiation

A diagram showing the three types of radiation.

A beta particle is a form of radiation given off by radioactive sources. It is a high speed electron emitted from a nucleus. In this form of radioactive decay a neutron changes into a proton and an electron; this electron is the beta particle.


Beta particles are stopped by a few millimetres of aluminium but can travel further than alpha particles and are therefore have a less strong ionising effect. This means they knock electrons out of air molecules forming positively charged air molecules.

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