The application of cavity theory to the dosimetry of electron fields

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Abstract
The literature indicates differences in the energy response of LiF dosemeters to high energy electrons. Attempts have been made in the past to explain these divergent findings in terms of cavity theory. Burlin, Snelling and Owen (1969) and Almond and McCray (1970) both derived expressions for electron beams from the general cavity theory of ionization for photons (Burlin 1966). Paliwal and Almond (1975) obtained experimental results which, according to them, proved the validity of Almond and McCray''s (1970) electron beam cavity theory. This note questions the conclusions reached by Paliwal and Almond. A number of inadequacies in the theoretical derivation of Almond and McCray''s expression for the cavity correction factor f for electron beams were pointed out. The experimental results of Paliwal and Almond, which at first seemed to verify Almond and McCray''s theory, are in disagreement with the present author''s calculations. Almond and McCray''s attempt to explain the energy response of LiF dosemeters to high energy electrons is inconclusive.

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