Abstract

A simple Monte Carlo model is used to calculate the response of a NaI(Tl) Compton suppression shield of an asymmetric design. The results are compared with source measurements. The predicted response at low energies is only obtained when coincidence techniques are used to remove incident γ-rays which have energies below that of a nominally mono-energetic source. The Monte Carlo model is then applied to a BGO shield to predict its response as a function of size and other parameters.

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