Patent ID: 8354650
Filing Date: 2013-01-15
Classification: G01T

Abstract:
1. A radiation detection and counting system comprising: a radiation detector element for outputting a signal having an amplitude related to an energy of a radiation event received thereby; an amplifier for amplifying the signal output by the radiation detector element; a gain equalization circuit for adjusting the gain of the amplified output signal; a plurality of comparators for comparing the gain adjusted amplified output signal to a like plurality of different valued trigger threshold signals independently adjustable of each other; a plurality of trimmer digital-to-analog converters (DACs), each of which is operative for outputting one of the trigger threshold signals to one of said plurality of comparators; a global threshold DAC operative for outputting a coarse trigger threshold signal to said plurality of trimmer DACs, each of which is further operative for fine adjusting the coarse trigger threshold signal to obtain the corresponding trigger threshold signal which is output to one of said plurality of comparators; a plurality of counters operative whereupon only the counter associated with the one comparator that changes state in response to the peak of the gain adjusted amplified output signal exceeding the value of the trigger threshold signal thereof is incremented; and storage means for storing the incremented value of each counter accumulated over a predetermined sample time interval.