| 摘要 |
PROBLEM TO BE SOLVED: To obtain a highly-sensitive and long-life neutron detector. SOLUTION: A tube part 4 is provided in the vicinity of an anode wire 3 inside an outer tube 1, and a neutron sensing substance is applied to the surface of the tube part 4. The tube part 4 is provided with a structure in which positive ions generated in the vicinity of the anode wire 3 can transmitted and reach the outer tube 1 cum a cathode, and the structure with a large number of holes or made of wires formed in a mesh shape is specifically suitable. By this, as neutron sensitivity is determined by the amount of the neutron sensing substance applied to the surface of the tube part 4, it is easy to increase and reduce neutron sensitivity in comparison with a conventional neutron detector in which an ionized gas also serves as the neutron sensing substance. Furthermore, as there is no need for using a neutron sensing gas as an ionized gas 2 and it is possible to use gases such as nitrogen, argon, helium, etc., it is possible to obtain the highly-sensitive and long-life neutron detector.
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