着重论述了本底计数对倒数外推方法的影响。
The paper particularly introduces the effect of background counting on the reciprocal extrapolation method.
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。
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.
她望着窗外，在计数——倒数上来。
She was looking out the window and counting - counting backward.
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