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Gamma rays are highly energetic waves and are poor at ionising other atoms or molecules. It cannot be said that a particular thickness of a material can absorb all gamma radiation. Many centimetres of lead or many meters of concrete are required to absorb high levels of gamma rays.

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Consequently, the penetration depth of alpha particles is very small compared to the other radiations. For low density materials, the range 2 of MeV alphas (from Am) is between - 5 mg/cm 2 ; higher density materials give a range between 5 and 12 mg/cm 2.

Gamma rays: high penetration capability and relatively low dose rate The energy-rich beta or gamma rays destroy the DNA of the microorganisms, thus inactivating them. Radiation sterilization is thus the only process that enables products, including their packaging, to be sterilized without any appreciable increase in temperature - and without the use of chemicals, which always involves the problem of residues.

Views: 8506 Date: 03.08.2019 Favorited:81
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