Soft radiation
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Soft radiation is a term used to describe high-energy electromagnetic radiation, typically high energy X-rays or gamma rays. The term refers to the ability of the rays to penetrate a given thickness of material, typically a lead shield.
Soft radiation is able to cross 5 g/cm-2 of brass but not 167 g/cm-2 of lead (composed by p with energy greater than 0.4 MeV, μ with E>80 MeV and e and γ with E>10 MeV) [1]
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