The invention discloses a
neutron moisture gauge
detector which comprises a housing, a
cadmium plate layer wrapped on the outer wall of the housing and a
neutron source arranged at a vertical center of the cavity of the housing, wherein a back reflection plate closely connected with the inner wall of the housing and the outer wall of the
neutron source is horizontally arranged in the cavity of the housing, an
electronics unit mainly composed by a
high voltage module and a
signal processing module is arranged at the bottom of the cavity of the housing,
residual space in the cavity of the housing below the back reflection plate is filled with shielding
layers, a plurality of sets of counting tube supports symmetrically arranged from interior to exterior and counting tubes installed on the supports are arranged around the head of the
neutron source in space in the housing above the back reflection plate, the root parts of the supports are fixed on the back reflection plate, the counting tubes are installed to form a
rectangular array, the height of the counting tubes on the supports gradually increases from interior to exterior to form ladder distribution, an inclined plane reflection plate in a loop corridor is arranged around the counting tubes on the supports, the sidewall of the inclined plane reflection plate is fixed on the sidewall of the housing, and the bottom of the inclined plane reflection plate is fixed on the back reflection plate. The neutron
moisture gauge
detector provided by the invention has the advantages of good sensitivity, high usage efficiency of the
neutron source and the like.