Measurement of effective energy on diagnostic X-rays using a thermoluminescence dosimeter (TLD)

X-rays were irradiated to a rod-type glass-sealed element of a thermoluminescence dosimeter (TLD), then the thermoluminescent value was measured on both sides of the X-ray incident and passage surfaces of the element. In view of the observed decrease in the value by 2∼15% on the side of the latter surface compared with the former, it is important for measurement of values having a small coefficient in the variation on diagnostic X-rays to make on a basis of the unification of photometric surfaces. The rate of the above decrease depends on the X-ray tube voltage and energy sensitivity correction filter attached to the element. Next, X-rays were irradiated to a TLD element using two kinds of filters (C and F type), then the relationship between the sensitivity ratio of these filters and the X-ray tube voltage were examined. As a result, we confirmed that a simple measurement of the effective energy for the diagnostic X-rays related to the sensitivity ratio and the incident energy curve with a combination of C and F filter types. (author)