The Fricke ferrous sulphate dosemeter has been calibrated against a plane-parallel extrapolation chamber for 60 kvp x-rays, HVL 0.20 mm Al, apparent quantum energy 12 kev. The energy absorbed in the Fricke dosemeter was assessed by the `relative effective density' method of Loevinger and Yaniv. A tabulation of errors, systematic and random, inherent in these measurements, has been made, end their effects evaluated. A value of G Fe+++ = 14.63 ± 0.26 was obtained.
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Geisselsoder et al. (1969) studied this question.
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