Abstract
An expression relating the constant A to the characteristics of an ionisation chamber is developed. This constant, used to obtain the mass ionisation from the instrument reading, appears in expressions for CE and Clambda , and is a function of the chamber wall material. Measurements with a Baldwin-Farmer chamber are described, and indicate that the effective wall material is more nearly equivalent to Lucite than to air in 60Co gamma radiation. The resulting value of A is nearly 1.5% lower than the figure commonly used.
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