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Nuclear Radiation [[image:nhh.jpg align="right"]]
When nuclear radiation passes through materials it ionises them. This means that radiation that (fast moving particles that carry a lot energy) knocks eletrons out of particles as it passes through a material and causes other particles to gain eletrons. This produces charged particles. The **ionisation** of particles can result in chemical changes which are bad for living cells.
 * What is it ?**

Types of nuclear radiation

 * **Alpha** particles, which can be stopped by a sheet of paper.
 * **Beta** particles, which need a few millimetres of metel tobe stopped
 * **Gamma** rays, which are parially absorbed by a few centimetres of metal

ionisation- removal from or addition of electrons to a particle
alpha - particle emitted by decay of something radioactive materials beta - particle emitted by decay of somthing radioactive materials gamma - particle emitted by decay of somthing radioactive materials