电离室剂量计校准系统中监测仪的稳定性监测

MONITOR FOR THE STABILITY OF AN IONIZATION CHAMBER USED AS A MONITOR INSTRUMENT IN THE CALIBRATION SYSTEM

以XF型医用诊断X射线剂量仪为治疗水平电离室剂量计校准系统中的监测仪器,对此监测仪器进行了两年多的监测、观察及线性回归分析处理,得监测值的线性相关系数r>0999999,标准偏差s为(20～100)×10-4Rmin(1R=2.58×10-4Ckg);标准值与监测值的比值平均为05224,比值的单次测量相对标准偏差sr为067%。这表明以XF型医用诊断X射线剂量仪作为监测仪是稳定可靠的。

By using a XF Ⅱ type clinical diagnosis x ray dosimeter (a circular plate ionization chamber) as a monitor instrument in the calibration system with the standard ionization chamber of therapeutic level, the ratio of monitor value to standard value is observed for more than 2 years. After treatment the monitoring value with linear regression analysis, the linear correlation coefficient is better than 0.999 999 with standard deviations s fallen into (2.0~10.0)×10 4 R/min(1 R=2.58×10 -4 C/kg) respectively. The mean value of ratio for monitor value to standard value is 0.522 4 with a relative standard deviation s r=0.67% (for a single determination). The results indicate that it is stable and reliable by using the XF Ⅱ type clinical diagnosis X ray dosimeter as a monitor instrument.