Hashim S, Musa Y, Ghoshal S K, Ahmad N E, Hashim I H, Yusop M, Bradley D A, Kadir A B A
Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia; Centre for Sustainable Nanomaterials (CSNano), Ibnu Sina Institute for Scientific and Industrial Research (ISI-SIR), Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia.
Department of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia; Centre for Energy Research and Training, Ahmadu Bello University, Zaria. P.M.B, 1014 Samaru, Nigeria.
Appl Radiat Isot. 2018 May;135:7-11. doi: 10.1016/j.apradiso.2018.01.010. Epub 2018 Jan 11.
The performance of optically stimulated luminescence dosimeters (OSLDs, AlO:C) was evaluated in terms of the operational quantity of H(10) in Co-60 external beam teletherapy unit. The reproducibility, signal depletion, and dose linearity of each dosimeter was investigated. For ten repeated readouts, each dosimeter exposed to 50mSv was found to be reproducible below 1.9 ± 3% from the mean value, indicating good reader stability. Meanwhile, an average signal reduction of 0.5% per readout was found. The dose response revealed a good linearity within the dose range of 5-50mSv having nearly perfect regression line with R equals 0.9992. The accuracy of the measured doses were evaluated in terms of operational quantity H(10), wherein the trumpet curve method was used respecting the 1990 International Commission on Radiological Protection (ICRP) standard. The accuracy of the overall measurements from all dosimeters was discerned to be within the trumpet curve and devoid of outlier. It is established that the achieved OSL AlO:C dosimeters are greatly reliable for equivalent dose assessment.
在钴 - 60 外照射远距离治疗装置中，根据 H(10) 的操作量对光激励发光剂量计（OSLDs，AlO:C）的性能进行了评估。研究了每个剂量计的可重复性、信号损耗和剂量线性。对于十次重复读数，发现每个接受 50mSv 照射的剂量计与平均值相比，其可重复性在 1.9 ± 3% 以内，表明读数器稳定性良好。同时，发现每次读数的平均信号降低 0.5%。剂量响应在 5 - 50mSv 的剂量范围内显示出良好的线性，回归直线接近完美，相关系数 R 等于 0.9992。根据操作量 H(10) 评估了测量剂量的准确性，其中按照 1990 年国际放射防护委员会（ICRP）标准采用了喇叭曲线法。所有剂量计的总体测量准确性被判定在喇叭曲线范围内且无异常值。已确定所获得的 OSL AlO:C 剂量计在等效剂量评估方面非常可靠。
