Measurement uncertainty analysis of radiophotoluminescent glass dosimeter reader system based on GD-352M for estimation of protection quantity
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초록
At the Korea Institute of Radiological and Medical Sciences, physical human phantoms were developed toevaluate various radiation protection quantities, based on the mesh-type reference computationalphantoms of the International Commission on Radiological Protection. The physical human phantomswere fabricated such that a radiophotoluminescent glass dosimeter (RPLGD) with a Tin filter, namely GD352M, could be inserted into them. A Tin filter is used to eliminate the overestimated signals in lowenergy photons below 100 keV. The measurement uncertainty of the RPLGD reader system based onGD-352M should be analyzed for obtaining reliable protection quantities before using it for practicalapplications. Generally, the measurement uncertainty of RPLGD systems without Tin filters is analyzedfor quality assurance of radiotherapy units using a high-energy photon beam. However, in this study, themeasurement uncertainty of GD-352M was analyzed for evaluating the protection quantities. Themeasurement uncertainty factors in the RPLGD include the reference irradiation, regression curve,reproducibility, uniformity, energy dependence, and angular dependence, as described by the International Organization for Standardization (ISO). These factors were calculated using the Guide to theExpression of Uncertainty in Measurement method, applying ISO/ASTM standards 51261(2013),51707(2015), and SS-ISO 22127(2019). The measurement uncertainties of the RPLGD reader system witha coverage factor of k ¼ 2 were calculated to be 9.26% from 0.005 to 1 Gy and 8.16% from 1 to 10 Gy. Ablind test was conducted to validate the RPLGD reader system, which demonstrated that the readoutdoses included blind doses of 0.1, 1, 2, and 5 Gy. Overall, the En values were considered satisfactory
Abstract
At the Korea Institute of Radiological and Medical Sciences, physical human phantoms were developed toevaluate various radiation protection quantities, based on the mesh-type reference computationalphantoms of the International Commission on Radiological Protection. The physical human phantomswere fabricated such that a radiophotoluminescent glass dosimeter (RPLGD) with a Tin filter, namely GD352M, could be inserted into them. A Tin filter is used to eliminate the overestimated signals in lowenergy photons below 100 keV. The measurement uncertainty of the RPLGD reader system based onGD-352M should be analyzed for obtaining reliable protection quantities before using it for practicalapplications. Generally, the measurement uncertainty of RPLGD systems without Tin filters is analyzedfor quality assurance of radiotherapy units using a high-energy photon beam. However, in this study, themeasurement uncertainty of GD-352M was analyzed for evaluating the protection quantities. Themeasurement uncertainty factors in the RPLGD include the reference irradiation, regression curve,reproducibility, uniformity, energy dependence, and angular dependence, as described by the International Organization for Standardization (ISO). These factors were calculated using the Guide to theExpression of Uncertainty in Measurement method, applying ISO/ASTM standards 51261(2013),51707(2015), and SS-ISO 22127(2019). The measurement uncertainties of the RPLGD reader system witha coverage factor of k ¼ 2 were calculated to be 9.26% from 0.005 to 1 Gy and 8.16% from 1 to 10 Gy. Ablind test was conducted to validate the RPLGD reader system, which demonstrated that the readoutdoses included blind doses of 0.1, 1, 2, and 5 Gy. Overall, the En values were considered satisfactory
참고문헌 (28)
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