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1931年,美国L.S.Taylor等以静电计,采用“衡消法”(null method或可译为“补偿法”)来测量×线束在标准游离室内所引起的微弱电离电流,借以确定×线剂量单位伦琴。这种方法,测量系统电路中除去静电计外,还连有一只精密补偿电容器C_1。因此首先必须用试验方法准确测定该电容的数值,因为在计算确定微弱电离电流的数值时必需用C_1的数值。因此C_1数值的准确测定,直接关系到标准游离室测量×线剂量单位的准确性。Taylo_r利用一只可变精密标准电容C并联于测量系统,改变C值,用试验方法求出相应的k值。理
In 1931, the United States LSTaylor et al electrometer, using the “null method” (null method or can be translated as “compensation method”) to measure × beam in the standard free room caused by weak ionization current, in order to determine × line dose unit roentgen. This method, the measurement system circuit to remove the static meter, but also with a precision compensation capacitor C_1. Therefore, first of all, the value of this capacitor must be determined experimentally, since the value of C_1 must be used in the calculation of the values that determine the weak ionization current. Therefore, accurate determination of the C_1 value is directly related to the accuracy of the standard free chamber measurement × line dose unit. Taylo_r using a variable precision standard capacitor C in parallel with the measurement system, change the C value, with the test method to find the corresponding k value. Reason