Impulse response shaping method for nuclear pulses based on derivative operations

Abstract

BackgroundImpulse response shaping (IRS) of nuclear pulses is often used to obtain the quantity and time information of incident particles. It is widely used in nuclear radiation intensity measurement, high-resolution energy spectrum analysis, high counting-rate energy spectrum correction, and coincidence and anti-coincidence measurements.PurposeThe study aims to propose an IRS method for nuclear pulses obtained in high counting-rate environments.MethodsFirstly, the output signal model of the nuclear radiation detector systems was established from the principal of signal generating. Then, the digital recursive solution of the IRS algorithm was derived on the base of the derivative operation. Finally, based on the principle of RC integral shaping circuit, the method of obtaining time constants in the digital recursive solution was given. Simulated signals and acquired silicon drift detector (SDD) signals obtained from the analog-to-digital converter (ADC) were tested.ResultsExperimental results show that the proposed algorithm is superior to the traditional IRS algorithm based on Z-transform, and has better counting-rate characteristics in high counting-rate environments.ConclusionsThe new IRS algorithm is suitable for applications with different accuracy requirements and shaping speed requirements, especially suitable for impulse response shaping in high counting-rate environments.

Keywords

• nuclear pulse signal
• impulse response shaping
• derivative operations
• z-transform