Abstract
A method of evaluating the effective energy of photon radiation by means of thermoluminescence dosimeters has been studied, that is based on the property of thermoluminescence phosphors to change their ratio of responses between measurements made behind two different filters according to the effective energy of radiation. With this "pair filter" method, the effective energy can be evaluated in a wide range of energies by changing the combination of materials and thicknesses of the filter pair. Compared with the phosphor method, the pair filter method will appreciably reduce the coefficient of variation representing the degree of scattering shown by the evaluated effective energy of photon radiation. It is considered that the pair filter TLD method should serve practically in evaluating the effective energy of radiation and the resulting exposure.
