The Concentric Cylinder Electron Capture Detector Standing Current Studies in the DC And Pulsed Voltage Modes

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Abstract
The standing current of a concentric cylinder electron capture detector was measured as a function of DC voltage and gas temperature, pressure, and flow rate. Charge collected per voltage pulse was measured as a function of pulse width and gas pressure. Empirical equations were obtained which describe the data in both modes of operation. The DC voltage standing current equation can be used to obtain a quantitative estimate of the extent of detector contamination. The pulsed voltage data show the transition from “pulsed mode operation” to the DC mode. N2 was used as the carrier gas.