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===Precautions===
: [[Alpha Particle|Alpha radiation]] is the most [[Ionising Radiation|ionising]] but the least [[Penetration Depth|penetrating]].
: [[Alpha Particle|Alpha]] sources are kept inside a block of [[lead]] with a hole that only allows the [[Alpha Particle|alpha particles]] out in one direction]].
: Outside the body an [[organism]] can be protected from [[Alpha Particle|alpha radiation]] by keeping a distance greater than 5cm or by covering any bare skin.
: When handling a source of [[Alpha Particle|alpha radiation]] the precautions which should be taken are: