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Efficiency transfer using the GEANT4 code of CERN for HPGe gamma spectrometry.

S Chagren¹, M Ben Tekaya¹, N Reguigui¹

¹Centre National des Sciences et Technologies Nucleairés 2020 Pole Technologique de Sidi Thabet, Tunisia.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine

|December 2, 2015

Summary

This study validates the GEANT4 code for calculating peak efficiency in High Pure Germanium (HPGe) gamma spectrometry. The GEANT4 code accurately determines detection efficiency, proving effective for HPGe detector calibration.

Keywords:

Efficiency transfer GEANT4 Gamma spectrometry HPGe detectors Monte Carlo

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Area of Science:

Nuclear Physics
Radiation Detection and Measurement

Background:

High Pure Germanium (HPGe) detectors are crucial for gamma spectrometry.
Accurate peak efficiency calculation is essential for quantitative analysis.
Existing methods for efficiency determination can be complex and time-consuming.

Purpose of the Study:

To apply the GEANT4 code for calculating peak efficiency in HPGe gamma spectrometry.
To evaluate three different procedures for efficiency calculation, including two efficiency transfer methods.
To assess the GEANT4 code's capability in determining accurate detection efficiencies without detector pre-optimization.

Main Methods:

Utilized the GEANT4 code from CERN for Monte Carlo simulations.
Implemented direct peak efficiency calculation.
Developed and applied two efficiency transfer procedures: one at constant energy and a novel one at variable energies.

Main Results:

Obtained good agreement between calculated and measured efficiencies for the investigated transfer methods.
Demonstrated that the GEANT4 code is an efficient tool for accurate detection efficiency values.
Validated a new efficiency transfer procedure for calibrating HPGe detectors across different emission energies.

Conclusions:

The GEANT4 code provides accurate peak efficiency values for HPGe gamma spectrometry.
Efficiency transfer methods, particularly the novel variable energy approach, are effective for detector calibration.
The findings support the use of Monte Carlo simulations for reliable gamma spectrometry measurements.