摘要
本工作介绍了墨西哥国家核研究所二级标准剂量测定实验室（SSDL-ININ）与试点实验室古巴放射保护与健康中心（SSDL-CPHR）之间的双边比较结果，以实现空气开尔玛（${\boldsymbol{K}}_{\boldsymbol{a}}$）量：(i) 诊断 X 射线 (DXR) IEC 61267:2005 光束质量：(ii) 辐射防护 (RP) ISO 4037:2019 X 射线束质量：N60、N100 和 W60，以及伽马辐射的 S-Cs。在 SSDL-ININ 使用东芝 E7252FX X 射线管实现了匹配和特征参考场。在所有情况下，${бoldsymbol{K}}_{\бoldsymbol{a}}$ 的测量都可追溯到 PTB，但 S-Cs 除外，可追溯到 ININ。SSDL-CPHR 还通过 Pantak HF160C X 射线管实现了匹配参考场的参考辐射光束质量。在 S-Cs 光束质量方面，CPHR 使用布赫勒 OB6 辐照器；ININ 使用西门子 Cesagammatron。校准 RQR 和 RQT 质量的转移电离室是 Exradin A650/DO70312；校准 CT 的 RQT 质量的是 PTW 30009/0655 和 RC3CT/9217；校准 RP X 射线质量的是 Exradin A650/DO70312 和 PTW 32002/073。RQR 质量的每个 SSDL 的校准系数${\boldsymbol{N}}_{\{boldsymbol{K}}_{boldsymbol{a}}$ 的比值在$\boldsymbol{U}}\left(\boldsymbol{k}=\mathbf{2}\right)\$ ≤ 2.3%；对于 RQT 质量，差异小于 $\boldsymbol{U}left(\boldsymbol{k}=\mathbf{2}\right)\%$ ≤ 3.6%；对于 RP X 射线质量，差异在 $\boldsymbol{U}left(\boldsymbol{k}=\mathbf{2}\right)\%$ ≤ 3.5% 的范围内。就 S-Cs 质量而言，${\boldsymbol{R}}_{\boldsymbol{k}}$ 在$\boldsymbol{U}left(\boldsymbol{k}=\mathbf{2}\right)$ ≤ 3.0% 的范围内。需要注意的是，由于 ${\boldsymbol{k}}_{\boldsymbol{TP}}$ 修正系数的失效，ININ U 的值通常较大，在此进行简要讨论。ISO 17043 中的 ${boldsymbol{E}}_{\boldsymbol{n}}$ 分数为这种比较提供了统计支持。The present work describes the results for the bilateral comparison between the Secondary Standards Dosimetry Laboratories of the Instituto Nacional de Investigaciones Nucleares (SSDL-ININ), Mexico, and the pilot laboratory, the Centro de Protección e Higiene de las Radiaciones (SSDL-CPHR), Cuba, for the realization of the air kerma (${\boldsymbol{K}}_{\boldsymbol{a}}$) quantity to: (i) diagnostic X-ray (DXR) IEC 61267:2005 beam qualities: RQR 5 RQR 9, RQT 8, and RQT 9 and (ii) radiation protection (RP) ISO 4037:2019 X-ray beam qualities: N60, N100, and W60, as well S-Cs for gamma radiation. The matched and characterized reference fields are realized at SSDL-ININ with a Toshiba E7252FX X-ray tube. In all cases, the ${\boldsymbol{K}}_{\boldsymbol{a}}$ measurements are traceable to PTB, except for S-Cs, traceable to ININ. The SSDL-CPHR realizes its reference radiation beam qualities also as matched reference fields with a Pantak HF160C X-ray tube. For the S-Cs beam quality, the CPHR uses a Buchler OB6 irradiator; the ININ, a Siemens Cesagammatron. The transfer ionization chambers calibrated in the RQR and RQT qualities are an Exradin A650/DO70312; for the RQT qualities for CT, a PTW 30009/0655 and RC3CT/9217 were calibrated; and for the RP X-ray qualities, the Exradin A650/DO70312 and a PTW 32002/073 were calibrated. The ratio ${\boldsymbol{R}}_{\boldsymbol{k}}$ of the resulting calibration coefficients ${\boldsymbol{N}}_{{\boldsymbol{K}}_{\boldsymbol{a}}}$ of each SSDL of the RQR qualities are consistent within the $\boldsymbol{U}\left(\boldsymbol{k}=\mathbf{2}\right)\%$ ≤ 2.3%; for the RQT qualities, the differences are less than the $\boldsymbol{U}\left(\boldsymbol{k}=\mathbf{2}\right)\%$ ≤ 3.6%; and for the RP X-ray qualities, within the order of $\boldsymbol{U}\left(\boldsymbol{k}=\mathbf{2}\right)\%$ ≤ 3.5%. For the S-Cs quality, the ${\boldsymbol{R}}_{\boldsymbol{k}}$ is in the order of $\boldsymbol{U}\left(\boldsymbol{k}=\mathbf{2}\right)$ ≤ 3.0%. It should be noted that the ININ U's are generally larger due to the failure of the ${\boldsymbol{k}}_{\boldsymbol{TP}}$ correction factor, a brief discussion is given here. The ${\boldsymbol{E}}_{\boldsymbol{n}}$ score from ISO 17043 provides statistical support to this comparison.
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