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Neutronics analysis of a subcritical blanket system driven by a gas dynamic trap-based fusion neutron source for ^(99)Mo production

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Nuclear Science and Techniques 2023年第4期34卷 14-25页

作者： Hou-Hua Xiong Qiu-Sun Zeng Yun-Cheng Han Lei Ren Isaac Kwasi Baidoo Ni Chen Zheng-Kui Zeng Xiao-Yu Wang School of Nuclear Technology and Chemistry&Biology and Hubei Key Laboratory of Radiation Chemistry and Functional Materials Hubei University of Science and TechnologyXianning 437100China Institute of Nuclear Energy Safety Technology Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Nuclear Reactors Research Centre National Nuclear Research InstituteGhana Atomic Energy CommissionBox LG 80Legon-AccraGhana Teaching and Research Section of Nuclear Medicine School of Basic Medical SciencesHefei Institutes of Physical ScienceAnhui Medical UniversityHefei 230031China

Gamma-emitting radionuclide ^(99m)Tc is globally used for the diagnosis of various pathological conditions owing to its ideal single-photon emission computed tomography (SPECT) ***,the short half-life of ^(99m)Tc (T_(1/2)=6 h)makes it difficult to store or ***,the production of ^(99m)Tc is tied to its parent radionuclide ^(99)Mo (T_(1/2)=66 h).The major production paths are based on accelerators and research *** reactor process presents the potential for nuclear proliferation owing to its use of highly enriched uranium (HEU).Accelerator-based methods tend to use deuterium–tritium(D–T) neutron sources but are hindered by the high cost of tritium and its challenging *** this study,a new ^(99)Mo production design was developed based on a deuterium–deuterium (D–D) gas dynamic trap fusion neutron source (GDT-FNS) and a subcritical blanket system (SBS) assembly with a low-enriched uranium (LEU) ***-FNS can provide a relatively high-neutron intensity,which is one of the advantages of ^(99)Mo *** provide a Monte Carlo-based neutronics analysis covering the calculation of the subcritical multiplication factor (k_(s)) of the SBS,optimization design for the reflector,shielding layer,and ^(99)Mo production *** calculations,including the neutron flux and nuclear heating distributions,are also provided for an overall evaluation of the production *** results demonstrated that the SBS meets the nuclear critical safety design requirement (k_(s)system can generate approximately 157 Ci ^(99)Mo for a stable 24 h operation with a neutron intensity of 1×10^(14) n/s,which can meet 50%of China’s demand in 2025.

关键词： Gas dynamic trap Fusion neutron source Molybdenum-99 Low-enriched uranium subcritical blanket system

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