Effect of the geometrical parameters of an HPGe detector on efficiency calculations using Monte Carlo methods

Subercaze, Alexandre; Sauzedde, Thibault; Domergue, Christophe; Destouches, C.; Philibert, H.; Fausser, C.; Thiollay, Nicolas; Grégoire, Gilles; Zoia, Andrea

doi:10.1016/j.nima.2022.167096

Cited by 11 publications

(3 citation statements)

References 33 publications

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“…Thus, a quick simulation is implemented to extract only the energy deposition in each crystal. The physics model is set to G4EmStandardPhysics_option4 as it is the most precise electromagnetic physics model among the EM modules listed in GEANT4 [32]. The cut is set to 0.01 mm for the 𝛾-ray.…”

Section: Simulation Codementioning

confidence: 99%

Conceptual design and simulated performance of the Barrel part of gamma array for the experimental terminal at HFRS of HIAF

Li,

Yan,

Wang

et al. 2024

J. Inst.

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The Barrel of γ array, consisting of 640 CsI(Tl) crystals and covering a polar angle range from 36.4° to 135.6°, has been designed for the experimental terminals at High energy FRagment Separator of High-Intensity heavy-ion Accelerator Facility in Huizhou. Together with the existing Endcap, consisting of 1024 CsI(Tl) crystals and covering a polar angle from 15.6° to 36.4°, at the External Target Facility in Lanzhou to form a new γ array, it is expected to meet the experimental requirements for in-beam γ-ray spectroscopy technique. A Monte Carlo code based on Geant4 was implemented to study the performance of the new γ array. Taking into account the Doppler correction and the intrinsic energy resolution of the detector, the energy resolution is 5.4% (FWHM) for the Endcap and 9.8% (FWHM) for the Barrel when the energy of the emitted γ-ray is 1 MeV in the Center-of-Mass frame with the beam energy of 500 MeV/u (beam velocity β = 0.759). The full-space photopeak efficiency is greater than 40% when the energy of the emitted γ-ray is less than 5 MeV in the Center-of-Mass frame and the beam energy is less than 700 MeV/u (β = 0.821). Such performance can satisfy most of the physics requirements for in-beam γ-ray spectroscopy experiments.

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Section: Simulation Codementioning

confidence: 99%

Conceptual design and simulated performance of the Barrel part of gamma array for the experimental terminal at HFRS of HIAF

Li,

Yan,

Wang

et al. 2024

J. Inst.

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“…The primary superiority of HPGe detector is its high energy resolution, which provides discrimination among near-energy (several keV) emissions [10]. The efficiency curve for a fixed source-sample location is typically optimized in HPGe detector models [11]. The activity concentration of radionuclides connected with a gamma line is calculated by precisely determining its energy peak yield.…”

Section: Introductionmentioning

confidence: 99%

Determination of Self-absorption Correction Factors of Some Algae Samples: An Experimental study

ÖZKARA>¹,

Eke²

2023

Türk Doğa Ve Fen Dergisi

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The purpose of this study to examine experimentally self-absorption correction factors (SACFs) of some algae samples using gamma-ray spectrometry. Various algae samples were collected from Boğaçay in Antalya, Turkey. Collected algae samples were dried, and masses of the samples were calculated. Then densities of the samples were calculated. Each of algaes was counted with and without point sources which are 22Na, 60Co, 133Ba, and 137Cs about 1000 seconds using high purity germanium detector. The SACFs of algae samples were calculated between 80 keV and 1332 keV gamma-ray energies. As a result, SACFs of studied algae samples generally reduce as gamma-ray energy enhances. SACFs of some algae samples are nearly steady because of the densities and elemental contents of the studied algaes.

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“…Azli & Chaoui (2015) used 100 million particles to achieve a relative error of less than 1% in the calculated efficiency. Subercaze et al (2022) used 3 million and Miroslav et al used 1 million particles in their study (Ješkovský et al, 2019). Therefore, as can be seen from the literature, a number of histories ranging from 1 million to 100 million were used.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Number of Particle History for Monte Carlo Codes in Gamma-Ray Spectroscopy

Uyar

GÜNEKBAY

2023

Gazi University Journal of Science Part A: Engineering and Innovation

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Monte Carlo is a numerical computation algorithm that is widely used in many fields of science and is used to obtain numerical results with a large number of repeated random samplings. Radiation transport with Monte Carlo simulation continues to increase its popularity in the fields of radiation measurement. The high accuracy and precision measurement of radionuclide activity amounts in gamma-ray spectrometry depends on the efficiency calibration of the detector. Efficiency calibration is carried out in two ways, using certified reference materials, by experimental method or Monte Carlo simulation method. The experimental method is expensive, procedurally complex and time-consuming due to the supply of reference material. The use of the Monte Carlo technique in a reliable way without the need for a standard radioactive source in determining the detector efficiency is becoming common. The most critical step for accurate and precise results in getting the response of a detector with the Monte Carlo method is modeling the detector with its realistic dimensions. Another parameter as important as detector modeling is the number of histories in the simulation code examined in this study. The effect of the number of histories on efficiency was examined in detail using PHITS, GESPECOR and DETEFF Monte Carlo simulation codes. Since there is no definite number about this effect, which is important for obtaining meaningful and realistic results, the change in the efficiency value was examined by increasing the number of stories from 105 to 108. The results obtained in this work showed that at least 107 particle numbers should be used in all three programs where the uncertainty is below 1%. If the existing facilities are sufficient, it can be increased to 108s in case of having a more equipped and fast computer. However, going higher than this value does not make any sense as seen from the study.

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Effect of the geometrical parameters of an HPGe detector on efficiency calculations using Monte Carlo methods

Cited by 11 publications

References 33 publications

Conceptual design and simulated performance of the Barrel part of gamma array for the experimental terminal at HFRS of HIAF

Conceptual design and simulated performance of the Barrel part of gamma array for the experimental terminal at HFRS of HIAF

Determination of Self-absorption Correction Factors of Some Algae Samples: An Experimental study

Comparison of the Number of Particle History for Monte Carlo Codes in Gamma-Ray Spectroscopy

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