Response of a Radiophotoluminescence Glass Dosimeter to Low Energy X-rays Necessary for Mammography

抄録

  New-type radiophotoluminescence (RPL) glass dosimeters, which had thin sensitive layers near their surface, were made for the examination of their response to low energy (15-25 keV) X-rays necessary for mammography. We constructed a laser scanning microscope system for the effective measurement of RPL photons from an X-ray irradiated glass dosimeter. The X-ray sensitive region of the new-type glass dosimeter was near its surface, and moreover a thin X-ray absorption glass filter, whose photon attenuation coefficient was almost the same as the glass dosimeter, was put on the new-type glass dosimeter. These new-type glass dosimeters were irradiated with low energy X-rays and measured results of absorbed dose around their surface layers agreed on the whole with results from photon transport calculations. It was confirmed that RPL glass dosimeters could make a reliable service to the low energy X-ray dosimetry for mammography.