Study on step accuracy measurement and dose deviation of 252 Cf neutron afterloading radiotherapy machine
10.3760/cma.j.issn.0254-5098.2017.08.014
- VernacularTitle:252Cf中子后装治疗机步进精度测量及其剂量偏差研究
- Author:
Mingsheng LI
;
Qinghuan JIANG
;
Ya LIU
;
Jinsheng CHENG
- Keywords:
EBT3 film;
Double ion chamber method;
252Cf neutron source
- From:
Chinese Journal of Radiological Medicine and Protection
2017;37(8):626-629
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the step aceuracy of 252Cf neutron afterloading radiotherapy machine and the dose deviation caused by step deviation.Methods EBT3 film was used to measure the steps of the 252Cf neutron source,and then the center of each 252Cf neutron source was identified by measuring the optical density value by using the ImageJ software.Double ion chambersmethod was used to measure the dose deviation dlue to the 252 Cf neutron source position shift.Results 252 Cf neutron source step accuracy may amount to 0.01 mm using EBT3 film measurement,when 252Cf neutron source position deviation is less than 3 mm,the dose deviation is less than 2.5％.Conclusions The study on the step accuracy and position deviation of the 252Cf neutron source can provide a reference for the quality control standard of the 252Cf neutron afterloading radiotherapy machine.
