Monte-Carlo simulations of the full-energy-peak efficiency for a broad-energy germanium detector—a comparison between GEANT4 and FLUKA

Aviv, O.; Elia, Paz

doi:10.1088/1748-0221/15/05/p05016

Cited by 10 publications

(4 citation statements)

References 18 publications

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“…On one hand, the detectors employed by Ješkovský et al (2019), and Khan et al (2018), tend to have a behavior that increases the FEPE until a zone near to 100 keV.After this range of energy in those type of detectors, the FEPE curve tends to decrease with energy(Ješkovský et al, 2019;Khan et al, 2018). On the other hand, the detectors employed byAviv & Elia (2020) the FEPE decreases while energy increases(Aviv & Elia, 2020). Analysis of figure3shows our values are different from Ješkovský et al (2019), and Khan et al (2018) but have similarities with Aviv & Elia.…”

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confidence: 61%

Simulation of a HPGe Detector with GEANT4

Sarasti-Zambonino

Barahona

Santos

2022

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Gamma spectroscopy is an analytic technique that identifies isotopes through gamma rays. Currently, gamma spectroscopy is widely used in several science fields, for instance, the study of the hydrodynamics of soils and other applications. Considering the development of computers, it has been developed Monte-Carlo simulation packages, in order to estimate the response of gamma spectroscopy detectors. This work aims to develop a GEANT4 application to estimate the full energy peak efficiency for a HPGe detector and determine the deviation with experimental data. It was carried out measurements of the next radioactive sources, Am-241, Eu-152, Cs-137, and Co-60. These measurements were made at different distances, they were at 0, 5, 10, 20, and 25 cm from the detector’s cover layer. Meanwhile, the simulation was carried out through user action classes to extract energy deposited in the sensitive detector. It was determined full energy peak efficiency of experimental data, through these results, it was estimated a detection factor that measures the deviation between experimental and simulated data. A reason for the deviation was that the simulation did not include the electronic chain of acquisition. Finally, it was suggested that future works should develop a more accurate simulation for multi-emitters isotopes.

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confidence: 61%

Simulation of a HPGe Detector with GEANT4

Sarasti-Zambonino

Barahona

Santos

2022

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“…There is extensive bibliography on the characterization of various types of spectrometers built around HPGe detectors in terms of the absolute efficiency, linear response and energy resolution (see e.g., [4][5][6][7][8]). Complementing experimental studies, the fast increase of high-computing power has facilitated detailed simulations of detector crystals and complex experimental setups, providing important knowledge on features which traditional experimental approaches can not access in a straightforward manner [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Call of duty: recommissioning an old HPGe detector

et al. 2023

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A decommissioned p-type, co-axial HPGe detector has been recently brought back to operational mode in an effort to build a γ-ray spectroscopy station at the National and Kapodistrian University of Athens dedicated for environmental radioactivity studies. The detector was fully characterized prior to and during its operation to obtain detailed information on its linear response, efficiency and energy resolution. The geometrical features of the HPGe crystal were studied with a combination of X-ray CT, γ-ray tomography and detailed simulations with both MCNP5 and Geant4. A 3D reconstruction of the crystal was attempted using the recorded data to examine its overall placement and alignment inside the enclosure. Due to the prolonged inactivity, the crystal integrity and the dead layer expected to develop over the years were additionally studied. The results show that after about three decades of inactivity, the active volume of the crystal has been reduced significantly, an effect having an impact on its quality features (resolution, efficiency). Overall, the detector was found to perform substantially well.

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“…In general, fulfill the 5% to 10% criteria according to the filling height of the cobalt-60 (60Co) volume source [8]. Aviv and Elia [10] used GEANT4 and FLUKA to correct the FEP difference of a broad-energy HPGe detector within 5% of the experimental value for point-like, filter paper, and water beaker-type sources.…”

Section: Introductionmentioning

confidence: 99%

Dead Layer Thickness and Geometry Optimization of HPGe Detector Based on Monte Carlo Simulation

Kwon

Jang

et al. 2022

Progress in Medical Physics

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A full-energy-peak (FEP) efficiency correction is required through a Monte Carlo simulation for accurate radioactivity measurement, considering the geometrical characteristics of the detector and the sample. However, a relative deviation (RD) occurs between the measurement and calculation efficiencies when modeling using the data provided by the manufacturers due to the randomly generated dead layer. This study aims to optimize the structure of the detector by determining the dead layer thickness based on Monte Carlo simulation. Methods:The high-purity germanium (HPGe) detector used in this study was a coaxial p-type GC2518 model, and a certified reference material (CRM) was used to measure the FEP efficiency. Using the MC N-Particle Transport Code (MCNP) code, the FEP efficiency was calculated by increasing the thickness of the outer and inner dead layer in proportion to the thickness of the electrode.Results: As the thickness of the outer and inner dead layer increased by 0.1 mm and 0.1 μm, the efficiency difference decreased by 2.43% on average up to 1.0 mm and 1.0 μm and increased by 1.86% thereafter. Therefore, the structure of the detector was optimized by determining 1.0 mm and 1.0 μm as thickness of the dead layer. Conclusions:The effect of the dead layer on the FEP efficiency was evaluated, and an excellent agreement between the measured and calculated efficiencies was confirmed with RDs of less than 4%. It suggests that the optimized HPGe detector can be used to measure the accurate radioactivity using in dismantling and disposing medical linear accelerators.

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Monte-Carlo simulations of the full-energy-peak efficiency for a broad-energy germanium detector—a comparison between GEANT4 and FLUKA

Cited by 10 publications

References 18 publications

Simulation of a HPGe Detector with GEANT4

Simulation of a HPGe Detector with GEANT4

Call of duty: recommissioning an old HPGe detector

Dead Layer Thickness and Geometry Optimization of HPGe Detector Based on Monte Carlo Simulation

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