The dose rate response characterization of four kinds of dosimeters for linear accelerator

VernacularTitle:四种剂量探测器对放疗加速器常用剂量率的响应特性分析
Author: Jun HAN ; Qin LI ; Ting CAO ; Zhiwen LIANG ; Mi CHEN
Publication Type:Journal Article
Keywords: Dose rate; Dose verification; Dosimeter; Response characterization
From: Chinese Journal of Radiological Medicine and Protection 2012;32(5):527-529
CountryChina
Language:Chinese
Abstract: Objective To explore the dose rate response characterization of four kinds of dosimeters for clinical application.Methods Within the range of 100-600 cGy/min,the dose rate responses of the PTW 0.6 cm3 ion chamber,0.015 cm3 ion chamber,Matrixx Evolution 2D diode array and MapCHECK 2D diode array under the same measuring conditions were measured.The dose rate response of the PTW 0.6 cm3 ion chamber under different energy and working voltage were analyzed.Results All ionization chambe.r types of measured equipment showed certain dose rate dependence for 6 MV X-rays.All the differences were below 1％.The dose rate dependence disappeared for 15 MV X-rays.The 2D diode array had strong dose rate dependence and the response difference was about 2％.Conclusions It is necessary to test and analyze the dose rate response of the measured equipment in treatment technology with dose rate varying,in order to ensure the precision of daily calibration and dose verification.