直流定電圧電源によるX線源の安定化
1960 年 29 巻 1 号 p. 12-15
詳細
1960 年 29 巻 1 号 p. 12-15
For precision measurement of diffracted X-ray intensity by G-M counter, durable stability of X-ray source is required first of all. The direct method of obtaining this stability is to keep the tube voltage and current strictly constant.
For regulating the voltage, a transmitting tube is used in series in the X-ray tube circuit with which the voltage stabilization is attained satisfactorily. As for the tube current, the regulation is achieved, with no detectable fluctuation, by the use of a variable load for controlling the filament.
In making up the counting losses correctly, it is desirable that the form factor, K, of the X-ray source (√K=root -mean-square intensity of source/mean intensity of source) be considered practically unity, so a discussion is given on the necessary capacity of the smoothing condenser to reduce the ripple.
From the results of intensity measurements that lasted for 6 hours, relative standard deviation with this arrangement of the X-ray source and the detector system was found less than 0.16 per cent with 95 per cent confidence.
