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Fast-neutron multiple measuring-analyzing method based on liquid scintillation detector

A scintillation detector, measurement and analysis technology, applied in the direction of scintillation detector measurement, etc., can solve the problems of occasional high background and affecting measurement accuracy

Active Publication Date: 2015-06-03
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

and 3 He measures the moderated thermal neutrons, which occasionally coincides with a relatively high background, which affects its measurement accuracy to a certain extent.

Method used

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  • Fast-neutron multiple measuring-analyzing method based on liquid scintillation detector

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Experimental program
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Embodiment

[0118] In this example, a self-built measuring device was used to 252 Experimental measurement and data analysis were carried out on Cf source to test the feasibility of this method.

[0119] (1) Measuring device

[0120] The measuring instrument consists of four BC501A liquid scintillator detectors 1 (see figure 2 ), an n / γ discrimination module MPD-4 (4 inputs and 4 outputs, only neutron signals are output during the experiment), a multi-channel signal timer MCS6A (6 inputs and 6 outputs, used for recording Arrival time of sub-signals and corresponding detectors) and a computer for data storage.

[0121] Among them, the horizontal axes of the four BC501A liquid scintillator detectors 1 are in the same plane, and one end of the four BC501A liquid scintillator detectors encloses the sample chamber 2, and the upper and lower parts of the sample chamber 2 are respectively provided with upper and lower covers 3 -1, 3-2.

[0122] The thresholds of the detectors are all set to...

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Abstract

The invention relates to a fast-neutron multiple measuring-analyzing method based on a liquid scintillation detector. The method comprises the following steps of building a mathematic model of fast-neutron multiple measurement based on the liquid scintillation detector, wherein the mathematic model is an equation set which is related to various multiple coincidence counting rates and unknown sample parameters; employing a plurality of liquid scintillation detectors to detect the sample source neutron fission process so as to obtain a neutron counting rate, and further obtaining various multiple coincidence counting rates; substituting the measured various multiple coincidence counting rates into the equation set, and solving the equation set so as to obtain the unknown sample parameters (spontaneous fission rate and induced fission rate). By employment of the fast neutron multiple measuring-analyzing method based on the liquid scintillation detector provided by the invention, a stable and reliable analysis result of a measured sample can be given out.

Description

technical field [0001] The invention belongs to the technical field of non-destructive analysis (Non-Destructive Assay, hereinafter referred to as NDA) of nuclear fuel, and specifically relates to a fast neutron multiplicity measurement and analysis method based on a liquid scintillation detector. Background technique [0002] The NDA measurement methods of nuclear materials (mainly uranium and plutonium) can generally be divided into neutron measurement method, gamma ray measurement method, calorimetry and so on. Due to the strong penetrability of neutrons, it has significant advantages over other methods when measuring nuclear materials with large masses, and it is also the only feasible measurement technology in some cases. Different from gamma measurement, fission neutron energy spectrum is a continuous spectrum, so neutron measurement is usually mainly to measure neutron count rate and time-correlated coincidence spectrum to determine relevant parameters of samples. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/06
Inventor 周浩林洪涛刘国荣李井怀梁庆雷赵永刚
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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