用闪烁探测器记录强度不变的核辐射时,在一定条件下,其计数率在某一区域内基 本上不随光电倍增管的工作电压变化而改变,通常称这一区域为“坪区”(见图1)。这种“坪”是闪烁探测器在一定条件下具有的特性,而不是光电倍增管本身的特性。利用闪烁探测器记录核辐射时,由于存在光电效应、康普顿效应、电子对效应等,闪烁探测器输出信号脉冲并不是等幅的, When using a scintillation detector to record the intensity invariant nuclear radiation, under certain conditions, its counting rate basically does not change with the working voltage of the photomultiplier tube in a certain area, which is usually called “Ping District” ( see picture 1). This “ping” is the property of the scintillation detector under certain conditions, not the characteristics of the photomultiplier tube itself. The use of scintillation detector nuclear radiation, due to the existence of the photoelectric effect, Compton effect, the electronic effect, scintillation detector output signal pulse is not equal amplitude,