参与IAEA/WHO医用加速器剂量输出比对的结果及分析

目的 通过参加国际原子能机构（IAEA）和世界卫生组织（WHO）组织的邮寄热释光剂量计（TLD）国际比对，检查医院加速器剂量输出的准确性。方法 申请IAEA/WHO邮寄TLD剂量核查，获得参与比对资格。每个能量照射两个TLD样品，照射剂量为2 Gy，并填写数据表格。将TLD及数据表邮寄回IAEA实验室。IAEA测量后给出比对结果。结果 6 MV光子束的两个TLD剂量均值为2.00 Gy，平均偏差为0.0%，10 MV光子束的两个TLD剂量均为2.02 Gy，平均偏差为-0.8%。结论 按照IAEA标准的允许偏差±5%考虑，本次比对结果符合比对要求。

Results and analysis of participation in the medical accelerator dose output comparison organized by IAEA/WHO

Objective To check the accuracy of medical accelerator dose by participating in international comparisons by postal TLD organized by the IAEA/WHO. Methods Apply for the IAEA/WHO postal TLD dose audit to obtain the participation qualification. For each energy condition, irradiate the 2 TLD samples at an irradiation dose of 2 Gy and fill out the data sheet. Mail the TLDs and data sheet back to the IAEA lab, and the results were given after the IAEA measurements. Results The mean measured dose of the 6 MV photon beam was 2.00 Gy with an average deviation of 0.0%, and the doses for 2 TLDs irradiated at 10 MV photon beam were both 2.02 Gy with an average deviation of -0.8%. Conclusion The comparison results met the requirement within allowable deviation of ±5% set by IAEA.