Abstract
In order to carry out a comparative study of the general cavity theory of Burlin (1970) and its modified version by Almond (1970) for electrons, large 7Li enriched lithium fluoride crystals were used as solid Bragg-Gray cavities. The crystals were embedded in a polystyrene phantom at 1.5 cm depth. Thermoluminescent response for 60Co, 7, 9, 11, 15, 18 and 28 MeV electrons was measured on an EG & G universal TLD reader. The response per rad in polystyrene was measured to be 9-11.2% lower for electrons compared to the response per rad in polystyrene for 60Co. Theoretical calculations were also carried out using Burlin's theory for electrons and the Almond theory. Almond's formulation predicts the relative decrease in response of LiF within experimental error, Burlin's theory on the other hand predicts a rather large decrease of 83 to 34% for the range of energies 7-28 MeV.
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