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Problem ?: Rocems A) What is the range in em. of a 7 MeV Heuterium ($1/) it bones Phone = 1.9 9/cm By How much energy does an alpha particle need to penetrate the minimal protective epidermal layer of skin (thickness -7 my/ cm )? P = Ta Range for Protons in Water Encray (MeV) Re (elem') 0.002 0.007 I P = 2 0.023 0.047 0.079