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論文

Accurate estimation of spectral density of LCS gamma-ray source

Omer, M.; 静間 俊行*; 羽島 良一*; 小泉 光生

第43回日本核物質管理学会年次大会会議論文集(インターネット), 3 Pages, 2022/11

Gamma-rays originated from laser Compton scattering (LCS) are convenient photon sources for nondestructive interrogation of nuclear materials. LCS can be used with nuclear resonance fluorescence (NRF) and X-ray fluorescence (XRF), the two of which are considered photon-based active interrogation techniques. However, an accurate estimation of the incident LCS $$gamma$$-ray flux is crucial. The $$gamma$$-ray flux is customarily measured using high purity germanium (HPGe) detectors, usually calibrated using standard point-like radioactive $$gamma$$-ray sources. These standard sources are entirely different from LCS beams in terms of detection geometry. Therefore, the calibration process must be corrected to meet the LCS beam conditions. Here, we demonstrate how to implement the required corrections and provide experimental validation of these corrections.

口頭

LCSガンマ線源を使用したビーム形状における同軸HPGe検出器の効率の評価

Omer, M.; 静間 俊行*; 羽島 良一*; 小泉 光生; 平 義隆*

no journal, , 

High-resolution $$gamma$$-ray spectroscopy involving beam geometry may be measured with higher efficiency if $$gamma$$-ray beam hits out of the axis of the coaxial HPGe detector. Hitting off-axis makes $$gamma$$-rays avoid travelling through the contact hole, which is an inactive axial portion of the detector. We performed Monte Carlo simulations to study the effects of contact hole dimensions and off-axis distance on the coaxial HPGe detector efficiency. The simulation considered $$gamma$$-ray energy up to 10 MeV. In general, the simulation results reveal that the off-axis efficiency is higher than on-axis efficiency for a wide range of $$gamma$$-ray energies and beams sizes. Our simulations results are validated by experimental measurements of $$gamma$$-ray beams generated from laser Compton scattering at UVSOR III facility.

口頭

Investigating effects of coaxial HPGe detector structure on the measurement of LCS $$gamma$$-ray beam

Omer, M.; 静間 俊行*; 小泉 光生; 羽島 良一*; Zen, H.*; 平 義隆*

no journal, , 

Coaxial high-purity germanium detectors are essential components of high-resolution $$gamma$$-ray spectrometers. Indeed, these detectors come in various dimensions with different internal structures. Particularly when the measured $$gamma$$-rays are in the form of a directed beam, the detector internal structure may affect the measured $$gamma$$-ray spectra significantly. Here we investigate the effect of the internal structure of two different coaxial HPGe detectors using 5.54 MeV $$gamma$$-rays generated by laser Compton scattering at the UVSOR III facility. The $$gamma$$-ray beam hit the detectors in two configurations, axial and nonaxial. We found that the nonaxial configuration provides higher efficiency and lower background than the axial configuration, which was confirmed using Monte Carlo simulations. Our results provide improvements in the measurement of $$gamma$$-ray beams. This work is a contribution of the Japan Atomic Energy Agency (JAEA) to the International Atomic Energy Agency (IAEA) under the agreement of the coordinated research program (CRP), J02015 (Facilitation of Safe and Secure Trade Using Nuclear Detection Technology - Detection of RN and Other Contraband).

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