针对高能光子束，比较NCS报告-2与国际原子能机构（IAEA）TRS-398报告的剂量学研究。

Dosimetry study comparing NCS report-2 versus IAEA report TRS-398 for high energy photon beams.

作者信息

Attalla E M, Khaled N E, Abou-Elenein H S, Elsayed A A

机构信息

Radiotherapy & Nuclear Medicine Department, National Cancer Institute, Cairo University, Mobile.

出版信息

Gulf J Oncolog. 2008 Jan(3):25-31.

PMID:20084794

Abstract

In this work a dosimetry study is presented in which the results of absorbed dose data determined under reference condition according to the IAEA TRS-398 protocol and the NCS report-2 are compared. The IAEA TRS-398 protocol for absorbed dose calibration is based on ionization chamber having an absorbed dose to water calibration factor N(D,W), while the NCS-2 report for absorbed dose calibration is based on an ionization chamber having an air- kerma calibration factor N(K). This study shows that the absorbed dose calculated with the IAEA TRS-398 formalisms is higher than that calculated with the NCS Report-2 formalism within a range of 0.4 to 0.9% in a cobalt-60 beam, and from 0.2 to 1.1% for photon beams of 6, 8 and 18 MV. The chambers used are PTW 30001, 30004, and NE-2571, which have calibration factors N(K) and N(D,W) traceable to the BIPM (Bureau International des Poids et Mesures).

摘要

本研究给出了一项剂量学研究，其中比较了根据国际原子能机构（IAEA）TRS - 398协议和国家计量标准（NCS）报告 - 2在参考条件下测定的吸收剂量数据结果。IAEA TRS - 398吸收剂量校准协议基于具有水吸收剂量校准因子N(D,W)的电离室，而NCS - 2吸收剂量校准报告基于具有空气比释动能校准因子N(K)的电离室。该研究表明，在钴 - 60射束中，用IAEA TRS - 398公式计算的吸收剂量比用NCS报告 - 2公式计算的吸收剂量高0.4%至0.9%，对于6、8和18 MV的光子束，该差值为0.2%至1.1%。所使用的电离室为PTW 30001、30004和NE - 2571，其校准因子N(K)和N(D,W)可溯源至国际计量局（BIPM）。