Abstract
Abstract Electron Monte Carlo calculations using CYLTRAN and a new PHSECE (photon produced secondary electrons) technique were carried out to estimate electron fluences and energy deposition profiles near LiF/Al and LiF/Pb material interfaces undergoing 60Co irradiation. Several interesting and new features emerge: (i) Although the build-up of the secondary electron fluences at the interfaces of the irradiated media is approximately exponential, the value of the electron mass fluence build-up coefficient, ?, is not equal to the electron mass fluence attenuation coefficient, ß. (ii) The ß value of the attenuation of the gamma generated electron fluences at the cavity-medium interfaces is strongly dependent on the Z of the adjacent material. (iii) For LiF/Pb there is a significant 'intrusion' energy deposition mode arising from 'side-scattering' in the wall (Pb) material. These new features of interface dosimetry (at least (i) and (ii)) are incorporated into photon general cavity theory and compared with experimental data.
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