用β源实现X、γ标准仪器的标定及量程扩展

CALIBRATION OF X AND GAMMA DOSIMETERS BY BETA SOURCE

用ＮＰＬ－２５６０剂量计测量自备的９０Ｓｒ检验源，标定其探头与灵敏度更高的电荷测量系统组成的新剂量计，使其测量下限向低端扩展。

In the paper a novel way of calibration for X and gamma dosimeter is described. NPL 2560 is a therapy level exposure meter. In this work the detector of NPL 2560 is connected with a high sensitive electrometer, in this way a new exposure meter which provides higher sensitivity is developed. A calibration of this kind of exposure meter usually is done with the X and gamma beams. In this work the calibration has been done with the beta radiation of a 90 Sr check source attached to the NPL 2560. The principle and operation is described in detail.