"nuclear - Light Conversion" Neutron Detector The Physical Structure Of The Design

This thesis focuses on the technical difficulties at present in measuring the time spectrum and the total number of pulsed fission neutrons in mixed radiation field. In this dissertation "Nuclear-optical Converters detector" is developed and applied in pulsed fission neutron measurement, and some main innovative research achievements are as follows:(1)"Nuclear-optical Converters detector" for pulsed fission neutron measurement is developed successfully for the first time in our country. The novel detector has flat neutron energy-response, large linear range, fast response time, high neutron/gamma-ray measurement SNR, and some other good properties.(2) The physical design techniques of "Nuclear-optical Converters detector" are completely established. The design optimizing techniques of the detector’s physical configurations are mastered. Up to present,"Nuclear-optical Converters detector" using235U as detection medium has the flat neutron energy response. From En=0.1MeV to14MeV, the changes of the detector’s neutron sensitivities can be controlled in100%.(3) The main physical parameters of "Nuclear-optical Converters detector" are studied with theoretical and experimental methods. The research results include:(a) The neutron and gamma-ray sensitivities relatively and neutron/gamma-ray sensitivity ratios of the detector are obtained with Geant4program.(b) The neutron and gamma-ray sensitivities are measured on DT neutron of DPF equipment and60Co gamma-ray radiation sources respectively. The measurement results have verified the reliability of the detector’s physical design techniques.(c) The time response characteristics of the detector are evaluated by mass and kinetic energy of fission fragments. The results show the detector’s time response is very fast.From the above,"Nuclear-optical Converters detector" is developed successfully for the first time in our country in this dissertation. The novel detector which is for pulsed fission neutron measurement has flat neutron energy-response, large linear range, fast response time, high neutron/gamma-ray measurement SNR, and some other good properties. The physical design techniques and experimental studies on the physical parameters of the detector are founded."Nuclear-optical Converters detector" and its corresponding pulsed fission neutron measurement techniques which are developed successfully for the first time in our country have many extensive application prospects.