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电流倍增
current multiplication
- 皮安计在最后一个倍增管电极处读取电流，此电流等于阳极电流减去流过前一个倍增管电极的电流。
The picoammeter reads the current at the last dynode, which is equal to the anode current minus the current flowing to the previous dynode. - 由于要测量的电流非常弱，所以用光电倍增管测量光的应用工作通常需要使用皮安计。
Applications such as measuring light with a photomultiplier tube generally require the use of a picoammeter due to the low current levels involved. - 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.
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