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Physics – Radioactivity – Absorption

Physics – Radioactivity – Absorption

Physics – Radioactivity – Absorption
A physics revision video all about absorption of radiation emitted by radioactive nuclei

Absorption of radiation

Alpha radiation is cannot penetrate a hand. Beta radiation can penetrate a hand but cannot penetrate aluminium. Gamma radiation can penetrate both a band and aluminium but cannot penetrate lead.

The energy of the three radiations is absorbed by the material through which the radiation passes. The amount of energy which is absorbed depends on the type of radiation and the type of the absorbing material.

  • The range of the alpha radiation in an absorbing material is less than that of beta or gamma. The alpha radiation transfers more energy to an absorber than beta or gamma radiation. Alpha radiation is absorbed by the thickness of the skin or by a few centimetres of air.
  • Beta radiation is more penetrating than alpha radiation. It can pass through the skin, but it is absorbed by a few centimetres of body tissue or a few millimetres of aluminium.
  • Gamma radiation is the most penetrating of the three radiations. It can easily penetrate body tissue. It requires a few centimetres of lead or about 1 metre of concrete to absorb it.

 

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