Pile-up pulse continuous zone reject method.

Area of Science:

• Nuclear Instrumentation
• Signal Processing
• Detector Physics

Background:

• High-count rate environments in radiation detection lead to pulse pile-up, distorting spectral data.
• Traditional trapezoidal shaping methods have limitations in effectively rejecting pile-up pulses.
• Accurate spectral analysis requires minimizing pile-up effects for reliable measurements.

Purpose of the Study:

• To develop and validate a novel method for continuous pile-up pulse zone rejection.
• To evaluate the effectiveness of different trapezoidal shaping techniques in mitigating pile-up.
• To improve the peak-to-background ratio in spectral data acquired at high count rates.

Main Methods:

• Simulated the performance of three trapezoidal shaping methods: without width discrimination, with fixed width discrimination, and with changing width discrimination.
• Conducted experimental validation using a silicon drift detector (SDD) and an ⁵⁵Fe source.
• Analyzed the impact of the proposed method on spectral characteristics, particularly peak-to-background ratios and high-energy peaks.

Main Results:

• The proposed method demonstrated a significant increase in the peak-to-background (P/B) ratio.
• High-energy characteristic peaks remained unaffected by the pile-up rejection technique.
• Simulations and experiments confirmed the method's efficacy in high-count rate conditions.

Conclusions:

• The novel pile-up rejection method offers substantial improvements for radiation detection systems operating at high count rates.
• The technique effectively enhances spectral quality by increasing P/B ratios while preserving spectral resolution.
• This advancement is crucial for applications requiring precise elemental analysis in challenging radiation environments.