质子治疗期间产生的次级中子的测量。

MEASUREMENT OF SECONDARY NEUTRONS GENERATED DURING PROTON THERAPY.

作者信息

Vykydal Z, Andrlík M, Bártová H, Králík M, Šolc J, Vondráček V

机构信息

Czech Metrology Institute, Radiová 1a, Praha 10 102 00, Czech Republic

Proton Therapy Center Praha, Budínova 1a, Praha 8 180 00, Czech Republic.

出版信息

Radiat Prot Dosimetry. 2016 Dec;172(4):341-345. doi: 10.1093/rpd/ncv504. Epub 2015 Dec 8.

DOI:10.1093/rpd/ncv504

PMID:26656077

Abstract

Measurements described in this article were carried out with the aim of evaluating risks of the patient exposure to secondary neutrons during treatment at the Proton Therapy Centre Prague. The neutron spectral fluence was measured by means of the extended Bonner sphere spectrometer (EBS). The article presents secondary neutron spectral fluences obtained by the EBS with passive thermoluminescent detectors, i.e. pairs of LiF and LiF chips. Measurements were performed in two positions: the first one behind the Nylon 6 phantom, and the second one close to the range shifter to evaluate their contribution to the generation of neutrons. Both the Nylon 6 phantom and the range shifter were irradiated with a pencil beam of protons 4 mm in diameter and the energy of 200 MeV. The results are supplemented with the values of effective dose derived from neutron spectral fluences.

摘要

本文所述测量旨在评估布拉格质子治疗中心患者在治疗期间受到次级中子照射的风险。中子能谱注量通过扩展邦纳球谱仪（EBS）进行测量。本文介绍了利用带有被动热释光探测器（即LiF芯片对）的EBS获得的次级中子能谱注量。测量在两个位置进行：第一个位置在尼龙6模体后方，第二个位置靠近射程移位器，以评估它们对中子产生的贡献。尼龙6模体和射程移位器均用直径4毫米、能量200兆电子伏的质子笔形束进行照射。结果还补充了从中子能谱注量得出的有效剂量值。