2-D-TOF-pulse neutron detector
[Problem to be Solved] The present invention presents a 2-D-TOF-pulse neutron detector which is able to measure accurate energy spectra, doses, 2-D incident positions and transmission image by measuring TOF of pulse neutron for BNCT and to display the result of the measurement on the transmission image. [Solution to Problem] The 2-D-TOF-pulse neutron detector includes a GEM-detector being put in a chamber filled with electrolytic-dissociative gas, 2-D-TOF readout integrated circuit and image processor.
1. A 2-D-TOF-pulse neutron detector, comprising:
a chamber filled with electric-dissociative gas;
a GEM detector having a drift electrode, plural GEM-boards and a 2-D-TOF readout electrode, which is included in the chamber; wherein,
the drift-electrode to generate electric field is placed at the uppermost part of the GEM detector;
the GEM-board having microscopic through-pores and neutron-converting material layer on the surface to convert neutron to α-ray and to generate electrons from the electric-dissociative gas through ionization effect of α-ray and successively to multiply the generated electrons in the microscopic through-pores applied with the electric field, is placed under the drift-electrode;
the 2-D-TOF readout electrode to detect electrons, is placed under the bottom GEM-board;
a 2-D-TOF readout integrated circuit mounting an ASIC-unit, FPGA-unit and time-clock electronic circuit housed in the FPGA, which is connected with the 2-D-TOF readout electrode; wherein,
the ASIC-unit including a 2-D-TOF readout electronic circuit to readout TOF, dose and 2-D incident position of pulse neutron, is connected with the 2-D-TOF readout electrode;
the FPGA-unit to perform digital calculation of TOF, dose, 2-D incident position and transmission image, is connected with the ASIC-unit;
the time-clock electronic circuit to calculate TOF of pulse neutron by means of independent free-setup, is housed in the FPGA;
an image processor to perform high speed-calculation of image data processing;
whereby, the measurement of energy spectra, doses, 2-D-incident positions and transmission image of pulse neutron in the range of 1 eV˜100 keV is performed in the TOF-range of 0.1 μs˜200 μs, detection of 10 8 neutrons/sec/cm 2 is performed in the TOF-range and displaying the result of the measurements is performed in real-time.