the count rate at the extrapolation of bias to zero varies monotonously with the anode current of phototube and tends to the activity of source as the inverse anode current approaches zero.
the study presented here is the first step in a program aimed at reducing significantly the background count rate of nai scintillation units.
这里程序第一步的学习是为了显着的减少非地址指令传送单元的暗中统计率。
split the count rate curve to several subarea, and use the microcontroller「s 2 timers to realize the precise pulse sending.
将计数率曲线分成若干分区,用微控制器的两个定时器实现脉沖的精确定时发送。
by measuring the variation of the x-ray count rate passing through the foam, the density of foam is precisely resolved.
通过测量x射线经靶材料吸收前后的强度变化,可较为精确地计算出待测样品的密度。
if he switched from gold to let」s say iron, he also tried platinum, a number of different foils, he found that they count rate it still was 20 alpha particles per minute.