Temperature Peak-Drift Correction Method for NaI(Tl) Detectors Using the Background Peak

Area of Science:

• Nuclear instrumentation
• Spectroscopy
• Applied physics

Background:

• Scintillation detector gain is temperature-dependent, causing gamma energy spectrum drift.
• Temperature-induced drift complicates accurate gamma spectrum analysis.
• Correction methods are crucial for reliable spectroscopic measurements.

Purpose of the Study:

• To develop and validate a temperature drift correction method for gamma spectrum analysis.
• To mitigate peak drift in scintillation detector measurements.
• To enhance the accuracy of gamma energy spectrum analysis without additional equipment.

Main Methods:

• Determining detector gain ratio by comparing background peak positions across spectra.
• Adjusting original spectra to correct for temperature-induced drift.
• Utilizing characteristic peak positions for secondary correction after energy calibration.

Main Results:

• Reduced relative deviation of ⁵⁷Co characteristic peak positions from 18.64% to 0.91%.
• Further reduction in ²²Na characteristic peak position deviation to 0.51% and 0.46% via secondary correction.
• Effective mitigation of peak drift using background peaks, avoiding extra radioactivity or circuitry.

Conclusions:

• The background peak correction method effectively minimizes temperature drift in gamma spectra.
• This technique enhances the accuracy of scintillation detector measurements.
• The approach offers a practical solution for improving gamma spectrum analysis in various applications.