| Popis: |
A multilayer cylindrical neutron spectrometer (CNS) system has been designed based on the similar principle of a commercial Bonner sphere spectrometer (BSS) system. The characteristics, e.g., spectral neutron fluence response functions and angular neutron fluence response functions, of the CNS system have been evaluated using MCNP6 simulations. The dosimetric quantities including neutron fluence rate ( $$\varphi _E$$ ), neutron ambient dose equivalent rate ( $${\dot{H}}^*(10)$$ ), neutron ambient dose equivalent-averaged energy ( $${\widetilde{E}}$$ ), neutron fluence-averaged energy ( $${\overline{E}}$$ ) and neutron fluence-to-ambient dose equivalent conversion coefficient ( $${\overline{h}}_\phi $$ ) of three neutron standard fields with $$^{241}$$ Am–Be source were evaluated using the CNS system. The standard uncertainties of the dosimetric quantities were also estimated and discussed. Comparison of dosimetric quantities measured by the CNS and the BSS systems was made in order to verify the operation of the CNS system. The discrepancies in $$\varphi _E$$ , $${\dot{H}}^*(10)$$ , $${\widetilde{E}}$$ , $${\overline{E}}$$ and $${\overline{h}}_\phi $$ measured by the CNS and the BSS systems are 7%, 5%, 8%, 11% and 3%, respectively. This agreement indicates that the CNS system is reliable for neutron dosimetry and radiation safety assessment. The CNS system is advantageous due to its compactness, portability and simplicity in fabrication. |
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