Abstract
A scintillation detector based on PbWO4 is used to measure gamma rays in a mixed neutron/gamma field from a high intensity pulsed reactor. In order to calibrate gamma sensitivities, a series of monoenergetic radioisotope sources are manufactured in a reactor. Two high-energy gamma sources were obtained from nuclear reactions 12C(p, γ)13N and 19F(p, αγ)16O by means of the 600 kV high voltage accelerator. The energy response of the detector to gamma rays in the energy range 0.15 MeV ⩽ En ⩽ 6.13 MeV was measured and the results are in good agreement with the MCNP simulations. In order to get the absolute sensitivities of the detector to neutrons, one experiment was carried out using 2.5 and 14.1 MeV neutrons from D(d, n)3He and T(d, n)4He reactions and another experiment was carried out using 0.565, 1.2, 1.8, 2.5 MeV neutrons from the T(p, n)3He reaction. The result shows the detector has a high gamma-to-neutron discrimination by comparing the gamma sensitivity at 1.25 MeV with the neutron sensitivity at 1.2 MeV. It is an appropriate gamma detector for pulsed gamma rays in a mixed neutron/gamma field.
Published Version
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