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https://doi.org/10.1080/00223131.2025.2457597
Copy DOIPublication Date: Jan 25, 2025 |
ABSTRACT The measurement results of current Fast Neutron Multiplicity Counting (FNMC) systems are susceptible to the size and shape factors of special nuclear materials under test, primarily due to the sample position or size dependence of the detection efficiencies of these systems. To reduce this effect, a symmetric spherical design for a FNMC system is proposed. Two systems made of 32 and 16 liquid scintillation detectors were simulated by Geant4, and the spatial uniformities of the detection efficiencies of the two systems were characterized. Compared with the system made of 16 liquid scintillation detectors, the detection efficiency of the system made of 32 liquid scintillation detectors is more uniform, due to the solid angle covered by 32 detectors is larger than that covered by 16 detectors. The relative deviations (RDs) of its detection efficiencies within a spherical radius of 6 cm in the system are less than ± 3.3%. Thus, a FNMC system made of 32 liquid scintillation detectors was built. Several 252Cf neutron sources were placed on the sample platform with different spatial distributions to characterize the spatial uniformity of the detection efficiencies of the system. And their spontaneous fission (SF) rates were calculated using the FNMC analytical equation. The results show that the RDs of the detection efficiencies within a radius of 6 cm in the system are less than ± 2%, and the RDs of the estimated SF rates of the neutron sources are less than ± 1.8%.
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