Development Of Boron Coated Tube Neutron Detectors Mechanical Structure

Because the ~3He (helium-3) gas reserves of the United States and Russia gradually decrease, now is in serious short supply condition, resulting in ~3He (helium-3) sharp increase in gas prices, and has severely affected to the Chinese customs and border supplies radiation monitoring system (RM system) equipment production. Enterprises in order to master core technologies and change those others decide to research substitute for ~3He neutron detectors. And the neutron detection technology also plays an important role in other areas, so it's not just business problems, is also the world-wide problems of Neutron Science. Thus the paper coating on the mechanical structure of boron-tube neutron detector design, analysis and testing, through the calculation of core components, simulation parameter settings and comparative analysis in order to find a reasonable, through performance tests and environmental adaptability tests to verify its feasibility as a substitute for ~3He neutron detectors.This thesis design the overall structure of boron-coated tube neutron detectors, and with a focus on design and analysis of the key parts of the detector in the boron coated tube coated boron and the main structures and materials. Analysis the relationships of boron coated tube anode-wire's diameter, anode-wire's dips in the tube and pretension. At last have the best value of the anode-wire's diameter and pretension. This thesis design and analysis about the slow's main structure and materials of the boron coated tube neutron detector another key component. This paper comparative analysis the mechanical and nuclear physics characteristics of PEEK and HDPE, use the method of numerical analysis comparing different materials of the slow's deformation and stress, eventually choose HDPE to make the slow which one has more H. This thesis design and analysis the structures about installation substrate, install lugs, electrical enclosures and how to waterproof and shockproof.In addition to the design process the main problem and key technology for focused consideration, and to verify the correctness of design from the experiment. The value in the performance test is better than the ~3He (helium-3) tube neutron detectors, prove that it can fully replace the ~3He neutron detectors and become the mainstream products of neutron detector in the new environment. After the high and low temperature test found that temperature changes can have an impact on neutron counting rate, high temperature will increase the count rate; low temperature makes it less, and the impact in high temperature is the most. But the variations at every stage are within the permitted framework, so the design is qualify.In vibration test comparing the x-axis, y-axis and z-axis vibration test results, the most impact to the value is the x-axis's vibration, the neutron value is more than the reference value, fit the requirement of reading increments, hence the description of boron coated tube installation is reasonable.This paper shows the design thinking and design method about the key components of the boron coated tube neutron detector, and verified the reasonableness and correctness of design thinking and design method by software simulation and experimental test, description of equipment application, proven boron coated tube neutron detector modules satisfy the actual requirements.