Neutron detector for detecting a neutrons, comprises an external shell of the boundary and the seal of the internal volume. External shell functions as a cathode. Central structure extends longitudinally within the outer shell. Central structure functions as an anode, is maintained at the first voltage. Neutron detector extends between the central structure and the outer shell beyond the shell end of the outer shell in the longitudinal direction, toward the structure end of central structure includes an insulating portion. Guard structure, circumferentially extending around the outer insulating surface. Guard structure is located on the insulating portion between the shell end and the structure ends. Guard structure, the leakage current of the external insulation surface, to be absorbed in the guard structure, is maintained at the second voltage. Further, a method of detecting neutrons in the neutron detector is provided.FIELD 1
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