建立高精度的β剂量刻度装置,对提高测量精度和可靠性是很有意义的。很多国家在初级标准剂量实验室(PSDL),或次级标准剂量实验室(SSDL),采用了依据空腔电离理论设计的外推电离室(以下简称外推室)作为防护水平和治疗水平的β吸收剂量测量的标准装置。对装置精度的判断有以下方法:采用精度更高的设备对装置校验与刻度;与相应精度的其它类型装置的测量结果相比较;在相应精度的同类装置间,对同一被测对象(达 The establishment of high-precision beta dose measuring device, to improve the measurement accuracy and reliability is of great significance. Many countries use extrapolated ionization chamber (hereinafter referred to as extrapolation chamber) designed according to the theory of cavity ionization for the level of protection and treatment in the Primary Standard Dose Laboratory (PSDL) or the Secondary Standard Dose Laboratory (SSDL) Beta Absorbed dose measurement standard device. The accuracy of the device to determine the following methods: the use of more accurate equipment on the device calibration and calibration; and the corresponding accuracy of the other types of devices compared to the measurement results; the same accuracy in the same device, the same test object