Measurements of Air-kerma in Mammography X-Ray Standard Using Free-air Chamber

被引：0
作者：
GUO Siming
WU Jinjie
LIU Ying
机构：
[1] NationalInstituteofMetrology
来源：
Instrumentation | 2017年 / 4卷 / 02期
关键词：
Metrology; Free-air Chamber; Air-kerma; Correction Factor; Degree Of Uncertainty;
D O I：
10.15878/j.cnki.instrumentation.2017.02.002
中图分类号：
R814.2 [X线剂量学];
学科分类号：
1001 ; 100105 ; 100207 ; 100602 ;
摘要：
Mammography x-rays standard is required to improve the quality of mammary machine and reduce the dose for w omen and staff. The molybdenum target x-rays machine is used as the radiation source and free-air cylindrical chamber is designed for detecting photon. Four standard radiation qualities are established w ith international standard documents as references. The Correction factors including air attenuation,scattered radiation,fluorescence,w all transmission,electron loss are studied in the four radiation quality. The uncertainty in absolute measurement of air-kerma includes air volume measurement of ionization chambers,current measurement,measurement of temperature and pressure,measurement of correction factors,physical constants and orientation of the reference distance. The relative combined standard uncertainty is 0.24%.
引用
收藏
页码：9 / 15
页数：7
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