Dosimetric properties of radiophotoluminescent glass detector in low-energy photon beams
Schematic diagram of a portion of the RGD readout system.
Photographs of the model GD-301 RGD and plastic holder. The size of GD-301 is 1.5 mm in diameter and 8.5 mm in length.
Block diagram of the readout system (Fig. 2 of Ref. 6). The RGD is excited by a pulsed ultraviolet laser, and photoluminescence light is measured by the system. The readout is then corrected with reference glass calibrated in terms of the absorbed dose with 137Cs gamma-ray source.
Schematic diagram of readout magazine. (See Ref. 10.) The readout magazine has a gap of 1.6–1.7 mm against the 1.5 mm diameter of the RGD.
Experimental configuration at PF in KEK.
Measurement setup for dose response of RGDs. Five RGDs were horizontally set to slits of styrofoam at intervals of 2.5 cm and were scanned across the slits to uniformly irradiate the RGDs.
Schematic diagram of the single field irradiation and bilateral irradiation methods.
Measurement setup for angle dependence of RGDs. The RGD angular dependence was measured at 0° (head-on with the tip of the RGD), 22.5°, 45°, 67.5°, and 90°.
Geometry used to calculate the dose for photon beams.
Geometry for simulation of dose profile curves within the RGD.
Energy dependence of the dose response of RGD measured in PF. The RGD was irradiated with a photon beam in the energy ranges of 8–60 keV for single field irradiation and 8–80 keV for bilateral irradiation. Each point represents the average value of five irradiated RGDs.
Reproducibility of the RGD. Each point represents the mean CV of five irradiated RGDs. The CV was the standard deviation divided by the mean readings for four readout values.
Variation in data obtained by the RGDs. We evaluated the CV calculated by the mean readings and standard deviation of five RGD irradiated with each energy level.
Angular dependence results of the RGD measured in 13, 17, 40, and 80 keV photon beams normalized to the response at 0°.
Energy dependence of the dose response of RGD calculated by EGS4.
Dose profile curves within the RGD using single field irradiation calculated by EGS4. The colored area represents the readout area (1 mm in diameter).
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