A graphite cavity chamber for absolute exposure measurements of 60 Co gamma rays is presented. The chamber is designed to allow the determination of the exposure to rely as far as possible on a theoretical analysis previously given by Allisy. As an extension of this analysis, the problem of the influence of the cavity thickness is treated. The values to be used for the physical constants involved and the correction factors are discussed as well as the related uncertainties.
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Boutillon et al. (1973) studied this question.
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