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用FJ-353液闪计数器,依传统方法测~3H时将测量道置于0.5～5.0V,调节光电倍增管高压与放大器增益,得最佳工作点为:高压1280V,放大器增益G_A为1/4×1或1/8×1、G_B为1/8×1。此条件下对~3H有比较高的测量效率。测~(14)C时将测量道置于5.0～10.OV,高压1250V,两路放大器中一路增益取最大值1×1,另一路增益取最小值1/32×1(或1/32×1/2)。当其中一路的输入脉冲过大或放大器增益过大时,这一路放大器便发生脉冲幅度饱和而工作在不正常状态下(即单饱和状态),与另一路相加后输出脉冲幅度分
Using FJ-353 liquid scintillation counter, measure the track to 0.5 ~ 5.0V according to the traditional method, adjust the photomultiplier tube high voltage and amplifier gain, the best working point is: high voltage 1280V, amplifier gain G_A is 1 / 4 × 1 or 1/8 × 1, and G_B is 1/8 × 1. Under this condition ~ 3H has a relatively high measurement efficiency. Measure ~ (14) C, place the measurement track at 5.0 ~ 10.OV and high voltage of 1250V, the maximum gain of the two amplifiers is 1 × 1 and the gain of the other one is 1/32 × 1 (or 1/32 × 1/2). When one of the input pulse is too large or the amplifier gain is too large, this amplifier pulse amplitude saturation occurs and work in an abnormal state (ie, single saturation state), and the other after the output pulse amplitude