Preliminary research on dosimetry methods of 252Cf neutron after-loading radiotherapy machine
10.3969/J.ISSN.1672-8270.2014.01.004
- VernacularTitle:252Cf中子后装治疗机剂量测量方法初步研究
- Author:
Mingsheng LI
;
Jinsheng CHENG
- Publication Type:Journal Article
- Keywords:
252Cf neutron after-loading radiotherapy machine;
Neutron-γ-ray mixed field;
Twine ion chambers method;
Dose
- From:
China Medical Equipment
2014;(1):11-13,14
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To study the dose measurements methods of neutron andγ-ray for 252Cf neutron after-load radiotherapy machine. Methods:To measure the neutron-γmixed field with one ion chamber that have the similar sensitivities of neutron andγ-ray, another ion chamber that only have sensitivities for γ-ray, little sensitivity for neutron. Verification measurement results with calculated values. Results:Calculate key parameters, measure neutron andγ-ray dose rate at the position of 2.5cm, 5cm, 7.5cm and 10cm from the 252Cf, the Maximum deviation is-5.22%compared with calculated values. Conclusion:The method of twin ion chamber can measure the neutron andγ-ray mixed field dose.
