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Neutrons

Neutrons have no charge and are constituents of the atomic nucleus. They are very penetrating and can only be stopped by hydrogen-rich materials, such as water or paraffin. Fast-moving neutrons are produced by fission reaction in a nuclear reactor. Water is commonly used to moderate and control the speed of neutrons.

 

Paraffin can stop neutrons

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Last revision date: <19 Dec 2012>