Reference Neutron Fields of the KIGAM for the Neutron Energy Range between 144 keV and 2.5 MeV

다국어 초록 (Multilingual Abstract)

The Korea Institute of Geoscience and Mineral Resources (KIGAM) is under the construction of the neutron standard facility as a national project. Neutron standards based on 1.7-MV tandem accelerator consist of the neutrons with the neutron energies of 144 keV, 250 keV, 565 keV, 2.5 MeV and with the fluence range from 10<SUP>2</SUP> neutrons/cm<SUP>2</SUP>/sec to 10<SUP>3</SUP> neutrons/cm<SUP>2</SUP>/sec. The systems for the neutron standards such as a duo-plasmatron ion source, a 4 MHz beam bunching system, a neutron chamber, an irradiation room, an n-TOF system, a long-counter, and a sample moving system, were designed and fabricated. Neutron energies of neutron standards and their spreads were observed by the n-TOF system. Their neutron fluencies were estimated by the long-counter at the neutron standard energies below 1 MeV and the proton-recoil counter at the neutron standard energy of 2.5 MeV. Long-counter efficiency was calibrated by JAEA FRS system, which was well known for maintaing the international neutron standards. The efficiency of the proton-recoil counter was obtained by the calculation with its detail construction information.

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