Assessment of the Characteristics and the Uncertainty of Radiophotoluminescence Glass Dosimeter for Low Energy Photon
DOI:
https://doi.org/10.33165/rmj.2024.47.3.268527Keywords:
Radiophotoluminescence glass dosimeter, Dosimetric characteristics, Low energy photon beamsAbstract
Background: Medical dosimetry has become critical. Recognizing the efficiency of glass dosimeters, which exhibit good reproducibility, small fading effect, and linearity over a wide range, it has brought to this study that aims to assess the characteristics and the uncertainty of radiophotoluminescence glass dosimeter (RPLGD) for low energy photon in diagnostic radiology.
Objective: To assess the characteristics and estimate the uncertainty of RPLGD for low energy photon.
Methods: Following IAEA Technical Reports Series No. 457, the determination of the half-value layer of Varian Acuity simulator was followed by the calibration of a model GD-352M RPLGD. The dosimetric characteristics (uniformity, dose linearity, accuracy, energy response, reproducibility, reader reproducibility, and magazine positioning reproducibility) were determined. The minimum detectable dose and the uncertainty were then estimated.
Results: This study showed good uniformity within 0.09%, dose linearity with R2 = 1 around 0 - 10 mGy, the accuracy of measurement was 0.21% around 0.5 - 10 mGy, low energy response (70 - 120 kVp) within 0.05%, good reproducibility within 0.04%, magazine positioning reproducibility within 0.01%. The minimum detectable dose for a model GD-352M RPLGD was 0.01 mGy. The measurement of uncertainty was 3.83%.
Conclusions: RPLGD was accurate to measure low energy photon beams. Moreover, the understanding of characteristics of RPLGD helps measuring radiation dose appropriately according to the situation.
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