The decrease in sensitivity of 'LiF to high energy electrons and x-rays when compared with ?LiF exposed t o 6oCo y-rays, first reported in 1966, was further investigated and the energy dependence measurements were also done for CaF, and LiBB,07. Measurements were made a t electron energies of 6 to 18 MeV, x-ray energies of 18.5 and 22 "I, and for y-rays from lS7Cs and 6oCo. The 610% decrease in response for LiF was confirmed, and a 3% decrease was found for both CaF, and Li,B,O,. The difference in response between ?LiF and the other phosphors can be considered as real, since the exposures at each energy were made using the same calibrations. To explain the results, the general cavity theory derived by Burlin has been used; good agreement with the experimental data is obtained over the entire range investigated.

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