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A New Temperature Correction Method for NaI(Tl) Detectors Based on Pulse Deconvolution.

Jianming Xie1, Liu Yang1, Jinglun Li1

  • 1State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China.

Sensors (Basel, Switzerland)
|June 10, 2023
PubMed
Summary

A new DTSAC method corrects temperature effects in NaI(Tl) detectors using pulse processing. This technique enhances energy spectrometry without extra hardware, improving accuracy across temperatures.

Keywords:
NaI(Tl) detectorpulse deconvolutiontemperature correctiontrapezoidal shaping

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Area of Science:

  • Nuclear Instrumentation
  • Spectrometry
  • Detector Physics

Background:

  • Temperature variations significantly affect the performance of Sodium Iodide (Thallium-doped) [NaI(Tl)] detectors.
  • Existing methods to mitigate temperature effects often require additional hardware or complex calibration procedures.

Purpose of the Study:

  • To introduce a novel, hardware-independent method for correcting temperature-induced drifts in NaI(Tl) detectors.
  • To validate the effectiveness of the DTSAC method in improving energy spectrometry accuracy.

Main Methods:

  • Developed the DTSAC (Deconvolution, Trapezoidal shaping, Amplitude Correction) method.
  • Measured detector pulses from a NaI(Tl)-Photomultiplier Tube (PMT) detector across a temperature range of -20 °C to 50 °C.
  • Applied pulse deconvolution, trapezoidal shaping, and amplitude correction for temperature compensation.

Main Results:

  • The DTSAC method effectively corrected temperature-induced drifts, with the 137Cs 662 keV peak position showing less than 3 keV drift.
  • Energy resolution at 662 keV remained within 6.91% to 10.60% across tested trapezoidal widths.
  • The method demonstrated successful correction without needing reference peaks or additional electronic circuits.

Conclusions:

  • The DTSAC method provides an efficient, hardware-free solution for mitigating temperature effects in NaI(Tl) detectors.
  • This approach simultaneously corrects pulse shape and amplitude, making it suitable for high counting rate applications.
  • DTSAC enhances the reliability and accuracy of energy spectrometry in environments with fluctuating temperatures.