Nuclear Engineering Graduate Program, Federal University of Rio de Janeiro (COPPE/UFRJ), Rio de Janeiro, Brazil.
Nuclear Engineering Graduate Program, Military Institute of Engineering (IME), Rio de Janeiro, Brazil.
Biomed Phys Eng Express. 2020 Sep 30;6(6). doi: 10.1088/2057-1976/abbabe.
The National Council on Radiation Protection and Measurements (NCRP) Report No. 151 is an essential document for bunker design commonly applied for radiotherapy treatment rooms. This document is used as a reference by several countries, including Brazil. The objective of this study is to evaluate the shielding dimensioning methodology recommended by NCRP 151, and compare it with the one adopted by the Brazilian regulatory authority. Radiotherapy rooms and respective doors were designed to use linear accelerators operating at 6, 10, 15, and 18 MeV under two different ways: (a) applying exclusively the methodology recommended by the NCRP 151, and (b) taking into consideration the complementary recommendations from the Brazilian authorities. The results suggest that designers in Brazil can count on at least 4 and 11% safety margin for dimensioning primary barriers in controlled and free areas respectively. Also 8% for secondary barriers in controlled areas, 9.7% for secondary barriers adjacent to the primary belt of free areas, and 6.6% for the lead of the doors.
《美国国家辐射防护和测量委员会报告 No.151》是用于放射治疗室的掩体设计的重要文件，被包括巴西在内的多个国家作为参考。本研究旨在评估 NCRP 151 推荐的屏蔽尺寸设计方法，并将其与巴西监管机构采用的方法进行比较。根据两种不同方式，使用工作在 6、10、15 和 18 MeV 的线性加速器来设计放射治疗室及其相应的门：(a)仅应用 NCRP 151 推荐的方法；(b)同时考虑巴西当局的补充建议。结果表明，巴西的设计者在对控制区和自由区的主屏蔽进行尺寸设计时，分别至少有 4%和 11%的安全裕度。在控制区的次屏蔽、紧邻自由区主屏蔽带的次屏蔽、以及门的铅衬里，也分别有 8%、9.7%和 6.6%的安全裕度。
