Digitizing methods and systems of nuclear radiation pulse width

摘要

Disclosed are methods and systems for amplitude digitization of nuclear radiation pulses. The method includes: applying a constant fraction discrimination (CFD) timing process on a subject current signal and outputting a CFD timing signal; applying a shaping process on the subject current 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 a time Tot as an over-threshold time if 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 at the time Tot, wherein a time length between the time To and the arrival time Td of the subject current signal is preset as ”T; converting a time length between the time Td and the time Tot into a digital quantity as a digitized value of the amplitude of the nuclear radiation pulse; wherein for any two subject shaped signals having amplitudes Vot1 and Vot2, respectively, the dynamic threshold signal satisfies an equation Tot �¢ 2 - To Vot �¢ 2 = Tot �¢ 1 - To Vot �¢ 1 , Tot1 represents an over-threshold time for one of the subject shaped signals compared with the dynamic threshold signal, and Tot2 represents an over-threshold time for the other of the subject shaped signals compared with the dynamic threshold signal.