Abstract
Application of photon general cavity theory requires knowledge of the electron mass attenuation coefficient, ß. One approach has been to adopt values of ß derived from the attenuation of beta ray spectra, which are based on a one-to-one correspondence between ß and the maximum energy of the beta ray spectrum. Other approaches are also available, so that, for 60Co generated electrons, for example, six different empirical expressions yield values of ß for LiF from a minimum value of 5.16 cm2.g-1 to a maximum value of 14.26 cm2.g-1. The results are reported of coupled photoelectron Monte Carlo calculations over a wide range of photon energies, 0.1 MeV < E < 1.4 MeV, and wall materials; Al, Cu, Cd and Pb. For the relatively low Z materials and over the energy range 0.3 MeV to 1.4 MeV, ß in LiF is given to within an accuracy of ±10% by the relation ß = 10.5 E-1.82 where E is expressed in MeV. ß is strongly dependent on Z so that for the high Z materials a simple power law relationship does not exist for any extended range of gamma ray energies.
Published Version
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