1271_Physics ProblemsTechnical Physics

1271_Physics ProblemsTechnical Physics - 612 Applications...

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612 Applications of Nuclear Physics (d) The decay rate for all steps in the radioactive series in steady state is set by the parent uranium: N = × F H G I K J ×= × 700 10 238 6 02 10 1 77 10 4 23 26 . .. g gmo l nuclei mol nuclei ej λ == × ln ln . . 22 447 10 155 10 12 9 10 T yr 1 yr RN × F H G I K J × 1 55 10 1 77 10 2 75 10 10 26 16 . 1 yr nuclei decays yr , so P × F H G I K J × QR 51 7 2 75 10 1 60 10 2 27 10 16 13 5 . . MeV 1 yr JMeV Jy r a f . (e) dose in rem = dose in rad × RBE 500 110 rem yr dose in rad yr = bg , giving dose in rad yr rad yr = 455 . The allowed whole-body dose is then 70 0 4 55 10 1 318 2 . kg rad yr Jkg rad r b g F H G I K J = . P45.52 EE k T TB ≡= = thermal eV af 3 2 0039 . T n = F H G I K J 1 2 where n number of collisions, and 1 2 20 10 6 = F H G I K J × n . Therefore, n 25 6 26 . collisions . P45.53 Conservation of linear momentum and energy can be applied to find the kinetic energy of the neutron. We first suppose the particles are moving nonrelativistically. The momentum of the alpha particle and that of the neutron must add to zero, so their velocities must be in opposite directions with magnitudes related by
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This note was uploaded on 12/15/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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