A Wide Range Counting-Campbelling Nuclear Instrumentation System

Feature of the present system is the use of the developed low noise current-sensitive preamplifier, counting loss compensation pulse rate-meter and fast response true-mean-square circuit. Noise level of the preamplifier is 10 PA/√Hz for 30 cable system. True mean square circuit operated at 100 KHz has a response time constant of 10 msec and a wide output range over 6 decades without level switching.