Background: This study investigated the effect of accumulated doses on radio-photoluminescence glass dosimeters (RPLGDs) from measurements involving mega-voltage photons. Methods: Forty-five commercially available RPLGDs were irradiated to estimate their dose responses. Photon beams of 6, 10, and 15 MV were irradiated onto the RPLGDs inside a phantom, which were divided into five groups with different doses and energies. Groups 1 and 2 were irradiated at 1, 5, 10, 50, and 100 Gy in a sequential manner; Group 3 was irradiated 10 times with a dose of 10 Gy; and Groups 4 and 5 followed the same method as that of Group 3, but with doses of 50 Gy and 100 Gy, respectively. Results: For the annealed Group 1, RPLGD exhibited a linearity response with variance within 5%. For the non-annealed Group 2, readings demonstrated hyperlinearity at 6 MV and 10 MV, and linearity at 15 MV. Following the 100 Gy irradiation, the readings for Group 2 were 118.7 ± 1.9%, 112.2 ± 2.7%, and 101.5 ± 2.3% at 6, 10, and 15 MV, respectively. For Groups 3, 4, and 5, the responsiveness of the RPLGDs gradually decreased as the number of repeated irradiations increased. The percentage readings for the 10th beam irradiation with respect to the readings for the primary beam irradiation were 84.6 ± 1.9%, 87.5 ± 2.4%, and 93.0 ± 3.0% at 6 MV, 10 MV, and 15 MV, respectively. Conclusions: The non-annealed RPLGD response to dose was hyperlinear for the 6 MV and 10 MV photon beams but not for the 15 MV photon beam. Additionally, the annealed RPLGD exhibited a fading phenomenon when the measurement was repeated several times and demonstrated a relatively large fading effect at low energies than at high energies.

中文翻译：

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放射光致发光玻璃剂量计对累积剂量的敏感性

背景：本研究通过涉及兆伏光子的测量研究了累积剂量对放射光致发光玻璃剂量计（RPLGD）的影响。方法：辐照四十五个市售的RPLGD，以估计其剂量反应。将6、10和15 MV的光子束照射到体模内的RPLGD上，将其分为五组，每组具有不同的剂量和能量。第1、2组分别以1、5、10、50和100 Gy的顺序照射；第3组以10 Gy的剂量照射10次；和第4组和第5组遵循与第3组相同的方法，但剂量分别为50 Gy和100 Gy。结果：对于退火的第1组，RPLGD表现出线性响应，方差在5％之内。对于未退火的第2组，读数显示了在6 MV和10 MV时的超线性，和15 MV时的线性。在100 Gy辐照后，第2组的读数在6、10和15 MV下分别为118.7±1.9％，112.2±2.7％和101.5±2.3％。对于第3组，第4组和第5组，RPLGD的响应度随着重复照射次数的增加而逐渐降低。在6 MV，10 MV和15 MV时，第10束辐照相对于一次束辐照的读数百分比分别为84.6±1.9％，87.5±2.4％和93.0±3.0％。结论：对于6 MV和10 MV光子束，非退火RPLGD对剂量的响应是超线性的，而对于15 MV光子束则不是。另外，退火的RPLGD在多次重复测量时表现出褪色现象，并且在低能量下显示出比高能量下更大的褪色效果。