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Consequently, the penetration depth of alpha particles is very small compared to the the half-value thickness of a given absorbing material for the gamma ray.

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The thickness of any given material where 50% of the incident energy has been Increasing the penetrating energy of a stream of photons will result in an Approximate HVL for Various Materials when Radiation is from a Gamma Source.

Half value layer (HVL) is the most frequently used quantity ore factor for describing both the penetrating ability of specific radiations and the penetration through specific objects. HVL is the thickness of material penetrated by one half of the radiation and is expressed in units of distance (mm or cm).

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