Abstract
Scalar flux spectra through graphite and aluminium from a 6.13 MeV photon isotropic uniform disc source have been obtained both by refined experimentation and Monte-Carlo calculations. Penetrations of up to 3 mean free paths in graphite and over 4 mean free paths in aluminium are presented. The emerging spectra show domination by Compton interactions. A technique is described for measuring scalar flux spectra using an unshielded NaI(Tl) spectrometer coupled to the unfolding code GAMAK plus a mathematically derived detector cross section.
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