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MCNP HPGe detector benchmark with previously validated Cyltran model.

I D Hau¹, W R Russ, F Bronson

¹Canberra Industries Inc., 800 Research Parkway, Meriden, CT 06450, USA. ihau@canberra.com

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

|March 6, 2009

Summary

This study compared MCNP and Cyltran simulations for a high-purity germanium (HPGe) detector. MCNP and Cyltran showed excellent agreement below 1000 keV, with minor discrepancies at higher energies.

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Area of Science:

Nuclear instrumentation and detector physics.
Computational physics and simulation methods.

Background:

Accurate simulation of detector response is crucial for nuclear measurements.
Previous studies utilized Cyltran for detector modeling and efficiency calculations.
High-purity germanium (HPGe) detectors are widely used in gamma-ray spectroscopy.

Purpose of the Study:

To validate the MCNP simulation code against Cyltran for a specific HPGe detector model.
To assess the accuracy of MCNP in reproducing detection efficiency compared to Cyltran.
To investigate the energy-dependent discrepancies between MCNP and Cyltran simulations.

Main Methods:

Reproduced an existing Cyltran detector model as an MCNP input file.
Calculated the detection efficiency using both MCNP and Cyltran simulation codes.

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Published on: June 7, 2018

Employed a methodology consistent with previous experimental measurements and simulations.

Varied the electron cut-off energy in MCNP simulations.

Main Results:

MCNP and Cyltran simulation results for detection efficiency correlated within 0.5% below 1000 keV.
Above 1000 keV, the difference between MCNP and Cyltran increased, reaching approximately 6% at 4800 keV.
The observed discrepancies were dependent on the electron cut-off energy used in MCNP.

Conclusions:

MCNP is a reliable tool for simulating HPGe detector efficiency, particularly at lower energies.
Further investigation into the energy-dependent differences between MCNP and Cyltran is warranted.
Optimizing electron cut-off energy in MCNP can improve simulation accuracy for high-energy photons.