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Estimation of effective dose using two ICRP criteria, applied to radiation protection of personnel in an unshielded PET cyclotron facility
Radiation Physics and Chemistry ( IF 2.8 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.radphyschem.2020.108688
Teresa Jakubowska , Magdalena Długosz-Lisiecka

Abstract Neutrons have no charge, but ionize indirectly through secondary particles.Neutron radiation is a source of exposure to ionizing radiation for personnel working withcyclotronsthat produce isotopes forpositron emission tomography (PET) radiopharmaceuticals.During production of isotopes in cyclotron in nuclear reactions beside gamma radiation are created also neutrons. The new recommendations of the International Radiological Protection Commission (ICRP) −103 have changed the method of calculating the neutron radiation weighting factor and the tissue weighting factor value that were defined in earlier ICRP recommendations (ICRP, 2007; ICRP, 1991; ICRP, 1996). The aim of this work is to estimate how this change influencesthe calculation of an effective dose in neutron radiation with a complex energy spectrum. This spectrum consists of three regions: a plateau area for thermal neutrons, a peak in the area of fast neutrons with a sharp edge from the high-energy side, and a mild field of decline for intermediate and epithermal neutrons. The application of new recommendations reduces the calculated effective dose by more than 10 mSv. The effect of increasing the effective dose for the maximum fluence area, i.e. energy near 1 MeV,by using a higher value of wR is negligible. The study finds that the new recommendations are less restrictive, and this is of great practical importance becauseno modification to the used shields is required.

中文翻译:

使用两个 ICRP 标准估算有效剂量,适用于无屏蔽 PET 回旋加速器设施中的人员辐射防护

摘要 中子不带电,但通过次级粒子间接电离。中子辐射是工作人员接触电离辐射的来源,回旋加速器为正电子发射断层扫描 (PET) 放射性药物产生同位素。还创造了中子。国际放射防护委员会 (ICRP) -103 的新建议改变了在早期 ICRP 建议中定义的中子辐射加权因子和组织加权因子值的计算方法(ICRP,2007;ICRP,1991;ICRP,1996 )。这项工作的目的是估计这种变化如何影响具有复杂能谱的中子辐射有效剂量的计算。该光谱由三个区域组成:热中子的高原区域、快中子区域的峰值与高能侧的尖锐边缘,以及中等和超热中子的温和下降场。新建议的应用将计算出的有效剂量降低了 10 毫希以上。通过使用更高的 wR 值来增加最大注量区域的有效剂量,即接近 1 MeV 的能量的影响可以忽略不计。研究发现,新建议的限制性较小,这具有重要的实际意义,因为不需要对使用过的防护罩进行修改。新建议的应用将计算出的有效剂量降低了 10 毫希以上。通过使用更高的 wR 值来增加最大注量区域的有效剂量,即接近 1 MeV 的能量的影响可以忽略不计。研究发现,新建议的限制性较小,这具有重要的实际意义,因为不需要对使用过的防护罩进行修改。新建议的应用将计算出的有效剂量降低了 10 毫希以上。通过使用更高的 wR 值来增加最大注量区域的有效剂量,即接近 1 MeV 的能量的影响可以忽略不计。研究发现,新建议的限制性较小,这具有重要的实际意义,因为不需要对使用过的防护罩进行修改。
更新日期:2020-06-01
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