Title :
A Technique for Measuring Extremely Low Ionization Chamber Currents Using MOS FET Circuitpry
Author :
Rosenblum, Lewis H. ; Bartky, W.S. ; Shaifer, T.R., Jr.
Author_Institution :
Picker Corporation Nuclear and Ultrasound Operations North Haven, Connecticut
Abstract :
A circuit has been developed for an Isotope Calibrator which will accurately measure ionization chamber currents in the order of 10-14 to 10-7amps. The circuit incorporates a self-zeroing feedback network which virtually eliminates drift, as well as high impedance MOS FET switches and a MOS insulated gate FET source follower in the input circuit to minimize errors due to leakage currents.
Keywords :
Current measurement; FETs; Feedback circuits; Impedance; Insulation; Ionization chambers; Isotopes; Leakage current; Switches; Switching circuits;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.1973.4326911
