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Device of measuring 235U quality

A quality and detector technology, applied in the field of devices for measuring 235U quality, can solve the problems of limited large-scale application, large interference of measurement results, and limited analysis accuracy, so as to ensure the uniformity of detection efficiency, ensure accuracy, and improve accuracy. Effect

Pending Publication Date: 2017-08-08
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

However, there are two shortcomings in the application of this traditional technology: one is that when the time correlation information between fission neutrons slows down from the ns level to the us level, when the coincidence measurement or multiplicity measurement is performed, the accidental coincidence pair measurement The interference of the results is large, the analysis accuracy is limited, and it is difficult to further improve
two is 3 He is a by-product of nuclear weapons production. In recent years, countries have basically stopped producing new nuclear weapons. 3 He is mainly based on the stock supply in the past, and its price has increased year by year, resulting in higher equipment costs (a set contains 100 3 The equipment cost of a typical measuring device for He pipe is about 10 million), which limits its large-scale application

Method used

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  • Device of measuring 235U quality

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Embodiment

[0025] Before device design, it is first necessary to set the appropriate effective sample chamber size. "Effective sample chamber" means that any position in the space satisfies better coupling uniformity and efficiency uniformity. Since the size of the sample to be tested is usually small in practical applications, the effective sample chamber size is set to 6*6*8cm 3 cube space. The invention has a regular hexagonal structure composed of six liquid scintillation detector head ends, and the effective sample chamber is arranged at the exact center of the hexagon. The selected liquid scintillator detector has a diameter of 12.7 cm and a thickness of 7.6 cm. The cylindrical liquid scintillator is wrapped in polyethylene into a cube shape, and polyethylene moderators and shields are placed in the triangular area between the detectors to reduce crosstalk. The neutron source adopts two AmLi neutron sources, which are placed symmetrically at the upper and lower ends of the sampl...

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Abstract

The present invention discloses a device of measuring the 235U quality. The device is mainly composed of a scintillator detector and a neutron source, the detection head ends of the scintillator detector are contacted with each other to form a regular polygon structure, and the neutron source is arranged inside the regular polygon structure. The present invention provides the 235U quality measurement device which takes the liquid scintillator detector as the basic, and is low in cost and high in measurement precision.

Description

technical field [0001] The invention belongs to the technical field of nuclear safeguards verification, in particular to a measurement 235 U quality fixtures. Background technique [0002] The measurement of nuclear material quality is one of the focuses of nuclear safeguards verification technology, among which 235 The measurement of U mass has always been a difficult point in NDA (Non-Destructive Assay, non-destructive analysis) measurement. 235 The NDA measurement of U quality is generally based on 3 The thermal neutron measurement device of He proportional counter tube and its corresponding measurement and analysis methods are relatively mature and widely used in various nuclear facilities. However, there are two shortcomings in the application of this traditional technology: one is that when the time correlation information between fission neutrons slows down from the ns level to the us level, when the coincidence measurement or multiplicity measurement is performed,...

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Application Information

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IPC IPC(8): G01T1/204
CPCG01T1/204
Inventor 周浩刘国荣李井怀鹿捷梁庆雷
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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