... 源位置：source position 源外推：source extrapolation 源水平可移接性：portability,source level ...
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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.
甄别电压外推到零时的计数率随光电倍增管阳极电流而改变，当阳极电流的倒数趋于零时，计数率趋于被测源的活度。
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