两种自制铅笔型电离室的实验室间比较

Maysa Costa Castro, N. F. Silva, Linda Viola Ehlin Caldas
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引用次数: 0

摘要

计算机断层扫描(CT)是一种诊断检查,病人在检查过程中接受的剂量值最高。多年来,这种设备一直在不断改进,以确保病人不会接受不必要的剂量。因此,对 CT 设备进行质量控制非常重要。在 CT 光束中进行剂量测定时,使用的仪器通常是敏感体积长度为 10 厘米的铅笔型电离室。不过,这种探测器有不同的灵敏体积长度。本研究的目的是比较巴西核能研究所(IPEN)和英国国家物理实验室(NPL)实验室中灵敏体积长度分别为 10 厘米和 30 厘米的两种自制铅笔型电离室的响应。所进行的特性测试结果符合国际建议的限度。在两个实验室中观察到的两个腔室反应的唯一区别是,由于光束特性的原因,在 IPEN 进行的所有测试中获得的电离电流都高于在 NPL 进行的测试。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interlaboratory comparison of two homemade pencil type ionization chambers
Computed tomography (CT) is a diagnostic exam responsible for the highest dose values received by the patients during the procedure. Over the years, this kind of equipment has been improved to ensure that the patients do not receive unnecessary doses. For this reason it is important to keep a quality control program for the CT equipment. To perform the dosimetry in CT beams, the instrument used is usually a pencil type ionization chamber with a sensitive volume length of 10 cm. However, this kind of detector is available with different sensitive volume lengths. The aim of this study was to compare the response of two homemade pencil type ionization chambers with sensitive volume lengths of 10 cm and 30 cm in the laboratories of Instituto de Pesquisas Energéticas e Nucleares (IPEN, Brazil) and National Physical Laboratory (NPL, UK). The characterization tests were performed, and the results obtained are within the international recommended limits. The only difference observed in the response of the two chambers in both laboratories is the fact that the ionization current obtained in all the tests at the IPEN is higher than at the NPL, because of the beam characteristics.
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