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

Abstract

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.

New Radiophotoluminescence Glass Dosimeter with Specialized Radiation-Sensitive Surface Layer

“…Moreover, after the irradiated glass samples were annealed at 400 C for 1 h, the orange light disappeared from them. These results were similar to those shown in previous reports 12,13) on glass dosimeters. It was confirmed that good RPL glass dosimeters could be fabricated without any problem even in the case of silver doping after the synthesis of phosphate glass.…”

Energy dependence and angular dependence of an optically stimulated luminescence dosimeter in the mammography energy range

“…The OSL dosimeter system included InLight nanoDot OSL dosimeters (Landauer Inc., Glenwood, IL, USA) and the microStar reader (Landauer Inc.). The nanoDot consists of a 0.2-mm-thick aluminum oxide-based (i.e., Al 2 O 3 :C) disk-shaped detector with a diameter of approximately 5 mm encased in a light-tight 10 9 10 9 2 mm 3 plastic case that had a mass density of 1.03 g/cm 3 . Standard nanoDots were used in this study (AE 10% variation in the labeled accuracy values provided by Landauer Inc.).…”

“…Some point‐based dosimeters such as thermoluminescent dosimeters and radio photoluminescent glass dosimeters have been used to directly measure dosage in patient dose management. The energy range in mammography is very low, compared to that used in general radiography and computed tomography (CT).…”

“…1 A prerequisite in patient dose management is that the benefits of screening should be considerably greater than the risks induced by the use of radiation. Some point-based dosimeters such as thermoluminescent dosimeters 2 and radio photoluminescent glass dosimeters 3 have been used to directly measure dosage in patient dose management.…”