Patent ID: 6590957
Filing Date: 2003-07-08
Classification: A61B,G01T

Abstract:
A method of operating a pulse processing spectrometer to produce an output spectrum of values held in a set of numbered bins, wherein the spectrum, referred to as the corrected spectrum, is corrected for pileup losses, the method comprising:using a fast channel to detect input pulses; using pileup inspection circuitry responsive to signals output from the fast channel to determine which detected pulses are piled up and which are not; using a slow channel to measure the pulses' energies; capturing energy values from the slow channel for at least some non-piled-up pulses; associating a bin number with each captured energy value; producing, from time to time, an estimate  of the average ratio of input pulses to non-piled-up pulses; and for each captured energy value, adding  to the value held in its associated bin.