Patent ID: 9182500
Filing Date: 2015-11-10
Classification: G01T

Abstract:
1. A method for amplitude digitization of a nuclear pulse, comprising steps of: applying, by a constant fraction discrimination (CFD) timing circuit, a CFD timing process on a subject pulse signal output from a nuclear event energy detector, and outputting a CFD timing signal for indicating an arrival time Td of a present nuclear event; applying, by a shaping circuit, a shaping process on the subject pulse signal to obtain a subject shaped signal; comparing, from a time To, values taken at the same time by the subject shaped signal and a dynamic threshold signal, and taking, as an over-threshold time Tot for the present nuclear event, a time when the value of the dynamic threshold signal changes from less than the value of the subject shaped signal to not less than the value of the subject shaped signal, wherein a time length between Td and To is preset as ΔT; converting a time length between Td and Tot into a digital quantity; wherein the dynamic threshold signal satisfies an equation Tot1 represents an over-threshold time for a first shaped signal compared with the dynamic threshold signal, Vot1 represents an amplitude of the first shaped signal, Tot2 represents an over-threshold time for a second shaped signal compared with the dynamic threshold signal, Vot2 represents an amplitude of the second shaped signal.