The Stopping-power Correction for Graphite Cavity-chambers used with 2 mV X-rays

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Abstract
A precise comparison has been made of the relative behaviour of a typical graphite cavity ionization chamber and an identical chamber made from an alloy of lithium and magnesium (average number of electrons per atom, 8.244). An examination has been made of the difficulties involved in determining precisely a stopping-power correction for the NPL graphite cavity ionization chambers in view of the existing uncertainties in the present state of knowledge. It is concluded that the present arbitrary total correction of −or+3% applied to the readings of the graphite chambers for wall absorption, lack of electronic equilibrium and stopping power cannot be seriously in error.
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