DETERMINATION OF AIR-KERMA STANDARD IN MAMMOGRAPHY X-RAY

摘要：

　　Mammography x-rays standard is basis of improving the quality of mammary machine and reduce the dose of women and staff.The molybdenum target x-rays machine is used as the radiation source,and free-air cylindrical chamber is designed for detecting photon.Refer to international standards file four standard radiation qualities are established.The Correction factors which include air attenuation,scattered radiation,fluorescence,wall transmission,electron loss and so on are studied in the four radiation quality.The uncertainty in absolute measurement of air-kerma include 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%.

关键词： Metrology Free-air Chamber Air-kerma Correction factor Degree of uncertainty

作者: S.M.Guo Y.Liu J.J.Wu J.Zhang

作者单位: National Institute of Metrology,Beijing,China

会议类型: 国际会议

会议名称: 国际测量技术联合会(IMEKO)2017年国际测量技术研讨会

会议地点: 杭州

会议语种:英文

页码: 53-58

在线出版日期: 2017-09-04（万方平台首次上网日期，不代表论文的发表时间）