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Unformatted text preview: NE524 Interaction of radiation with Matter Problem Set #4 (Complete by 11/6/2005)
1) Give 1 gram of At218 (T1/2 = 1.5 seconds), and assuming that all the alphas (E=6.694 MeV) interact with an Aluminum absorber in 0.1 seconds, how much energy is deposited per cm thickness of Al? What is the average range of At218 alphas in Al? What is the velocity of the At218 alphas? Using the Bethe formula, calculate the stopping power of 12 MeV He3 ions in lead (Ipb = 788 eV). 2) Find the range in air, water, and aluminum for 3 MeV deuterons?
3) 4) What is the range of a 9 MeV proton after passing through a 0.025inch thick piece of graphite?
5) How much energy does an alpha particle need to penetrate the protective epidermal layer of the skin (thickness ~ 7 mg/cm2)? Answers: 1) 7.832E20 MeV, 3.5E3 cm, 1.8E7 m/s 2) Air, Water, Al: 9.64, 1.31E2, 6.16E4 cm 3) 1551 MeV/cm 4) Does not make it through. 5) 8 MeV ...
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This note was uploaded on 04/11/2008 for the course CHNE 524 taught by Professor Mohagheghi during the Fall '08 term at New Mexico.
 Fall '08
 Mohagheghi

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