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          technical article

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          Neutron detection

          2015/1/21 9:14:08 (Browse times: 2015/1/21 9:14:08)

          Neutron detection: Measurement of the number and energy of neutrons. Neutron detection is required in the use of nuclear energy, the production of radioisotopes, and applied nuclear physics. However, the neutron itself is not charged, does not cause ionization and other effects, and does not produce direct observable effects. It is through the interaction of neutrons and nuclei to detect the reaction products.
          The basic methods are: ① recoil proton method. Use of elastic scattering of neutrons and protons to generate recoil protons. The counter is filled with hydrogen-containing gas, or a hydrogen-containing solid is used to make the entrance window of the counter. The number and energy of neutrons can be determined by measuring the number of recoil protons and energy distribution. ② nuclear reaction method. Use (n, a) reaction or (n, p) reaction to generate charged a particles or protons to detect neutrons. The more commonly used reaction is 10B (n, a) 7Li. The BF3 gas was sealed in a proportional counter, and the a particles produced by the neutron reaction caused counting. The other is to use the heavy nuclear fission reaction of neutrons to detect neutrons by the strong ionization generated by fission fragments. Coating uranium compounds on the inside of the ionization chamber or sealing UF6 gas in the chamber. If 235U is used, it is sensitive to slow neutrons; if 238U is used, it is sensitive to fast neutrons. ③ activation method. Many elements can become radionuclides under neutron irradiation, so a thin film of an appropriate material can be placed in the neutron stream, and then its strong radioactivity can be measured with a common counter.
          Common neutron detection equipment: The REN800 neutron dose equivalent (rate) meter uses a highly sensitive imported He3 tube as a detector, which has a fast response speed. The instrument is easy to use; it has high sensitivity, good anti-gamma performance, and good energy response characteristics. It can be used as a portable instrument or as a fixed neutron dose monitor.

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