White light neutron imaging method and system for nuclide identification
An imaging system and imaging method technology, which can be applied in the direction of measurement with semiconductor detectors, etc., can solve the problems of inability to achieve broad-spectrum neutron measurement, inability to achieve white light neutron imaging in the full resonance energy region, etc., and achieve low-cost effects.
Active Publication Date: 2021-09-03
CHINA SPALLATION NEUTRON SOURCE SCI CENT +1
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However, due to the limitations of the camera itself, this method cannot achieve continuous wide-spectrum neutron measurement, and can only select a narrow energy range each time, and cannot achieve white-light neutron imaging in the full resonance energy region.
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[0033] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings. Wherein, similar elements in different implementations adopt associated similar element numbers. In the following implementation manners, many details are described for better understanding of the present application. However, those skilled in the art can readily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the application are not shown or described in the description, this is to avoid the core part of the application being overwhelmed by too many descriptions, and for those skilled in the art, it is necessary to describe these operations in detail Relevant operations are not necessary, and they can fully understand the relevant operations according to the description in the specification and genera...
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The invention discloses a white light neutron imaging system and method for nuclide identification, and the system comprises a white light neutron source capable of emitting white light neutron beams, a conversion screen and a gamma ray detector; pure B-10 is used as the conversion screen, and the B-10 has a large neutron absorption cross section, has no formant structure and has higher detection efficiency for neutrons in a full resonance energy region; after a neutron is absorbed, a gamma ray of about 480keV can be emitted, that is, the gamma ray is used as a signal for capturing the neutron, and then a gamma ray detector sensitive to the gamma ray is used for detecting the ray of the energy, so the neutron imaging function of an all-energy region can be realized. Therefore, the to-be-detected sample is placed between the white light neutron source and the conversion screen, and the position information and energy information of the white light neutrons penetrating through the sample can be detected, so that nuclide identification and wide-spectrum neutron imaging can be realized with high efficiency and low cost by utilizing the wide-spectrum characteristic of the white light neutron beam and combining the B-10 conversion screen and the gamma ray detector.
Description
technical field [0001] The invention relates to the field of nondestructive testing, in particular to a white light neutron imaging method and system for nuclide identification. Background technique [0002] Neutrons have the characteristics of deep penetration, which is especially suitable for internal imaging detection of samples with large components. White light neutron beam refers to a neutron beam with a very wide energy spectrum. Usually, the neutron energy in the beam ranges from 0.025eV (thermal neutron energy region) to tens of MeV (fast neutrons). When the white light neutron beam interacts with matter, different nuclides and neutrons of a certain energy undergo resonant absorption reactions, forming a characteristic resonance peak structure on the white light neutron energy spectrum, so that nuclide (including isotope) identification can also be realized. [0003] At present, only thermal neutron imaging technology is relatively mature in neutron imaging technol...
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IPC IPC(8): G01T3/08
CPCG01T3/08
Inventor 敬罕涛田斌斌孙艳坤李强
Owner CHINA SPALLATION NEUTRON SOURCE SCI CENT