Optimal design method of self-powered neutron detector structure

A neutron detector, optimized design technology, applied in neutron radiation measurement, instrument, nuclear power generation, etc., can solve problems affecting the performance of self-sufficient neutron detectors

Active Publication Date: 2017-11-03
XI AN JIAOTONG UNIV
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Problems solved by technology

[0007] The size of the emitter, insulator and collector is different, the proportion of the number of neutrons that can enter the emitter is different, the ratio of gamma photons generated by neutron capture into current is also different, and the particles released during the decay process are converted into curre...

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  • Optimal design method of self-powered neutron detector structure
  • Optimal design method of self-powered neutron detector structure
  • Optimal design method of self-powered neutron detector structure

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Embodiment Construction

[0048] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0049] Rhodium ( 103 Rh) The dependence of the performance of a self-powered neutron detector in a reactor on the radius of the emitter was taken as an example.

[0050] Such as figure 1 as shown,

[0051] Step 1: Select the shape and parameters of the self-powered neutron detector geometry: from the inside to the outside are emitter, insulator and collector respectively, coaxial structure, such as figure 2 shown. The initial values ​​of the geometric parameters are: the emitter radius is 0.1 mm, the insulator thickness is 0.305 mm, the collector thickness is 0.25 mm, and the length is 40 cm.

[0052] Step 2: Input the geometric parameters in the Monte Carlo software to establish the basic geometric feature layer of the self-sufficient neutron detector. The basic geometric feature layer is divided into three parts (coaxial), which are emitt...

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Abstract

An optimal design method of a self-powered neutron detector structure comprises the steps of 1, selecting shape and parameters of self-powered neutron detector geometry; 2, establishing a basic geometric characteristic layer in a program; 3, imparting a material to the basic geometric characteristic layer; 4, defining energy, position and incoming direction of primary incoming neutrons; 5, adding a required physical process; 6, simulating a process where the incoming neutrons physically react with the material, recording quantity of secondary electrons drifting from an emitter or an insulator to a collector and arrival time, and outputting based on class; 7, calculating a neutron sensitivity and transient current ratio of the self-powered neutron detector; 8, saving a data point, and judging whether returning to step 2 occurs; 9, acquiring a variation curve of detector performance with detector parameters; 10, determining the structure and size of the detector as required finally in order to improve the detector performance. The method of the invention can provide professional optimal design for neuron spectrums of any reactor.

Description

technical field [0001] The invention relates to the technical field of reactor neutron flux measurement, in particular to an optimal design method for a self-powered neutron detector structure. Background technique [0002] Because of its high energy density, nuclear energy occupies an irreplaceable position in the sustainable energy structure. But nuclear safety is a key issue that must be solved in the application of nuclear energy. In nuclear reactors, the neutron flux density is a key physical quantity to monitor and control the normal operation of the reactor. Due to the high temperature, high pressure and strong radiation environment of the reactor core, general detectors are not competent. The self-powered detector has become an important detector for monitoring the neutron flux of the reactor core due to its characteristics of no bias voltage, simple structure, small size, solidification of the whole body, and simple electronic equipment. Its typical structure is ...

Claims

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Application Information

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IPC IPC(8): G21C17/108G21C17/00G01T3/00
CPCG01T3/006G21C17/001G21C17/108Y02E30/30
Inventor 张清民刘昕昕邓邦杰
Owner XI AN JIAOTONG UNIV
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