【摘要】 目的:使患者肿瘤获得均匀、准确的照射剂量,重要器官得到保护,正常组织尽可能少的受到照射。方法:①根据IAEA TRS277报告(97年版)《光子与电子束的吸收剂量测量》及国家计量检定规程JJG589-2001《外照射辐射治疗源》的有关内容,介绍对加速器、钴-60治疗机产生的医用高能电离辐射,在水模体中吸收剂量的测量和对加速器的剂量刻度。②通过医生确定的给予肿瘤照射的组织剂量,计算出在特定条件下,对应于加速器上的剂量仪应给出的处方剂量。③本文较为详细的介绍了剂量测算中有关治疗水平剂量计与安装在加速器机头里的监督剂量仪以及射野特性、射束质、输出剂量的质保措施。结果:对此,全文除文字上的论述外,在各有关章节上笔者都较为详实的列举了一些实例进行计算,给出了定量的结果。结论:严格、准确的吸收剂量测量(包括加速器的剂量刻度)和处方剂量的计算以及加对速器的质量控制与保证是治愈肿瘤的最基本的保证。更多还原

【Abstract】 Purpose:getting the symmetrical and precise exposure dose to protect concernful organ and to reduce the exposure dose of healthy organ.Method:①This paper introduces the measure of absorbed dosage produced by the medical ionizing radiation of high-energy emanated from Cobalt-60 therapy machine(a kind of medical accelerator) operated in water mould,as well as the dose calibration of medical accelerator.This is based on IAEA TRS277 Report Photon and Electron Beam Absorbed Dose Measurement and JJG589-2001 V.R.of Radiation Source Used in the External Beam Radiotherapy.②Calculating the dose prescription corresponding with the meter of medical accelerator satisfied with the given conditions based on the tissue does used on tumor irradiation determined by doctor.③Thi paper presents the cure level dosimeter related with dose calculations,dose monitor fixed in the head of medical accelerator,as well as the characteristic of radiation field,quality of beam and quality maintenance of output dose.Results:Except the text discourse,there are also some examples of calculation to support the conclusion.Conclusion:The basic guarantee of curing tumour is including the strict and accurate measurement of absorbed dose(including dose calibration of medical accelerator),calculation of prescription dose along with the control and guarantee with the medical accelerator.更多还原