Introduction To Health Physics
Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 5, Problem 5.30P
To determine

The number of neutrons/s from 9Be(ϒ, n )8Be reaction.

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An aluminum foil of thickness 0.30 mm is bombarded by energetic neutrons. The aluminum nuclei undergo neutron capture according to the process 2Al(n,y)28 Al, with a measured capture cross section of 2.0×1031 m². Assuming the flux of incident neutrons to be 5.0×10¹2 neutrons/ cm²-s, calculate the number of neutrons captured per second by 1.0 cm² of the foil. The density of aluminum is 2.7 g/cm³.
A beam of α particles falls on 9Be nuclei. A resonance it is observed for an incidence energy of 1.732 MeV. a) Calculate the excitation energy ∆E of the corresponding state of the composite nucleus. b) The same state of resonance occurs in the collision of neutrons with 12C nuclei, Calculate the energy of the neutron beam in this resonance condition. Answers: a) 11.85 MeV, b) 7.48 MeV.
Consider aCI nucleus to be a sphere with the seventeen protons uniformly distributed throughout. (a) Determine the radius of this sphere (in m). 3k Q? (b) If the energy needed to assemble a uniformly charged sphere of charge Q and radius R from separate charges is U = "e, determine the energy (in MeV) needed to assemble 5R a uniformly charged sphere consisting of seventeen protons and with the radius determined in part (a). |Mev (c) Determine the binding energy (in MeV) for the nucleus CI. (Let the mass of a proton be 1.0078 u, the mass of a neutron be 1.0087 u, and the mass of CI be 34.9689 u.) MeV
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