Nuclear and Radiation Metrology Section, Regulatory Support Division, Office of Atoms for Peace, 16 Vibravadi-Rungsit Rd., Chatuchak, Bangkok, Thailand; Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut's University of Technology North Bangkok, Bangkok, Thailand.
Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, King Mongkut's University of Technology North Bangkok, Bangkok, Thailand.
Appl Radiat Isot. 2021 Apr;170:109586. doi: 10.1016/j.apradiso.2021.109586. Epub 2021 Jan 14.
Graphite wall cavity chambers are the most common detector for precise gamma-ray measurement and are accepted as primary standards for radiation protection and radiotherapy level beams. This paper describes the physical constants and the evaluation of the correction factors that are necessary for the graphite cavity chamber to be established as a primary standard of the Office of Atoms for Peace (OAP). The correction factors to be applied to the primary standards were determined by experimental and Monte Carlo methods. The evaluation of the standard according to the recommendations of ICRU 37 and ICRU 90 report for graphite cavity chamber is presented including the uncertainty budget. Finally, the comparison results using ICRU 37 and ICRU 90 data are presented in this paper to give confidence in the establishment of this primary standard.
石墨壁空腔室是精确伽马射线测量最常用的探测器，被公认为辐射防护和放射治疗水平束的主要标准。本文介绍了建立石墨空腔室为和平原子机构（OAP）的主要标准所必需的物理常数和修正因子的评估。要应用于主要标准的修正因子是通过实验和蒙特卡罗方法确定的。根据 ICRU 37 和 ICRU 90 报告中对石墨空腔室的建议，对标准进行了评估，包括不确定度预算。最后，本文给出了使用 ICRU 37 和 ICRU 90 数据的比较结果，为建立这一主要标准提供了信心。
