Neutron angle correlation distribution information acquisition system

Abstract

The utility model relates to the technical field of nuclear radiation, in particular to a neutron angle correlation distribution information acquisition system, which comprises a neutron detector, a time position sensitive detector module, a time flight measurement module, a synchronous trigger control module, a signal processing module, a data acquisition module and a spherical support frame, the system adopts a structure in which multiple neutron detectors are uniformly distributed, is combined with a time position sensitive detector module and a time flight measurement module, is distributed on a spherical framework, and can collect neutron angle correlation distribution in a 4pi space angle, including neutron energy, time and angle; and angle distribution, time difference distribution, energy association, event counting and direction association information are obtained, and data information support is provided for radionuclide identification.

Description

Technical Field

[0001] This utility model relates to the field of nuclear radiation technology, and in particular to a neutron angle correlation distribution information acquisition system. Background Technology

[0002] Non-invasive nuclear analysis (NDA) is a non-invasive method whose key advantage is that it can accurately infer the properties of nuclear materials by detecting radiation emitted during spontaneous or induced fission reactions of non-uniformly distributed nuclear materials without affecting their physical or chemical state. Therefore, NDA is currently the most economical and effective analytical method for measuring and analyzing non-uniformly distributed nuclear materials.

[0003] Currently, NDA technologies mainly fall into three categories: gamma-ray analysis, neutron measurement, and calorimetry. Calorimetry is suitable for samples with high thermal power and large mass, but the measurement time is relatively long. Gamma-ray analysis is commonly used for radionuclide identification. However, for special nuclear materials, under non-destructive testing conditions, gamma rays are easily attenuated by elements with high atomic numbers, leading to drift, annihilation, and distortion of the gamma energy spectrum, especially at the low energy end, which complicates nuclide identification. Fission neutrons, as emitted radiation from special nuclear materials, are attenuated less by heavy elements and carry energy, time, and angular information, exhibiting a certain correlation. Due to their kinetic characteristics, the neutrons released from fission fragments move along the fission axis, resulting in a macroscopic angular distribution of fission neutrons, known as neutron angular correlation distribution. This neutron angular correlation distribution is closely related to the characteristics of atomic nuclei and can fully reflect the characteristics of radionuclides, making it applicable to radionuclide identification.

[0004] Therefore, in order to meet the needs of nuclide identification, it is necessary to provide a neutron angle omnidirectional acquisition system that can capture neutron signals from multiple angles and provide comprehensive information about radioactive materials or nuclear reaction processes as a basis for nuclide identification. Utility Model Content

[0005] This utility model discloses a neutron angle correlation distribution information acquisition system, which adopts a structure with multiple neutron detectors evenly distributed, combined with a time position sensitive detector module and a time-flight measurement module, distributed on a spherical architecture. It can collect neutron angle correlation distribution within a 4π spatial angle, including neutron energy, time, and angle, and obtain angle distribution, time difference distribution, energy correlation, event count, and direction correlation information, providing data information support for radionuclide identification.

[0006] This utility model provides a neutron angle correlation distribution information acquisition system, comprising: a neutron detector, a time-position sensitive detector module, a time-flight measurement module, a synchronization trigger control module, a signal processing module, a data acquisition module, and a spherical support frame. Its features are as follows:

[0007] The number of neutron detectors, time-position sensitive detector modules, and time-flight measurement modules is 6n, where n≥1. The neutron detectors, time-position sensitive detector modules, and time-flight measurement modules are uniformly fixed on the spherical support frame. The probes of the neutron detectors, time-position sensitive detector modules, and time-flight measurement modules point towards the center of the spherical support frame. The synchronous trigger control module, signal processing module, and data acquisition module are located outside the spherical support frame.

[0008] The neutron detector, the time-position sensitive detector module, and the time-flight measurement module are electrically connected to the signal processing module and the data acquisition module in sequence, respectively.

[0009] The neutron detector, time-position sensitive detector module, time-flight measurement module, and data acquisition module are electrically connected to the synchronous trigger control module.

[0010] The preferred technical solution is as follows: the neutron detector, the time-position sensitive detector module, and the time-flight measurement module are uniformly fixed at the k-th fixed point on the spherical support frame, satisfying the following: Where θ k φ is the zenith angle. k It is the azimuth angle.

[0011] The preferred technical solution is that the neutron detector is a liquid scintillation detector, a helium-3 detector, or an aluminum boride detector.

[0012] The preferred technical solution is that the data acquisition module includes a signal amplifier, an analog-to-digital converter, and a data processing unit.

[0013] The preferred technical solution is that the time-position sensitive detector module is a multichannel time analyzer, a photon multiplier tube, a silicon photomultiplier tube, or a position-sensitive detector.

[0014] The preferred technical solution is that the time-flight measurement module is a time-to-digital converter or a time-to-amplitude converter.

[0015] The preferred technical solution is that the synchronous trigger control module is a function generator, a distribution trigger, or a logic analyzer.

[0016] The preferred technical solution is that a shielding material is provided around the fixing point of the spherical support frame.

[0017] The preferred technical solution is that the shielding material is lead or boride.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. By adopting a structure with multiple neutron detectors evenly distributed, combined with a time-position sensitive detector module and a time-flight measurement module, the required information on energy, time, and angle of neutron angle correlation distribution can be collected in a single measurement.

[0020] 2. By uniformly fixing the neutron detector, time-position sensitive detector module, and time-flight measurement module on the spherical support frame, and with all detector probes pointing towards the center of the spherical support frame, equal sensitivity to neutron signals from all directions can be ensured.

[0021] 3. The use of the synchronous trigger control module increases the system's response speed and synchronization accuracy, ensuring that signals from different detectors can be accurately processed synchronously, thus improving data reliability. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of a neutron angle correlation distribution information acquisition system according to the present invention;

[0024] 1. Neutron detector; 2. Time-position sensitive detector module; 3. Time-flight measurement module; 4. Synchronous trigger control module; 5. Signal processing module; 6. Data acquisition module; 7. Spherical support frame. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0026] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0027] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0028] As attached Figure 1 As shown: This utility model provides a neutron angle correlation distribution information acquisition system, including: a neutron detector 1, a time-position sensitive detector module 2, a time-flight measurement module 3, a synchronization trigger control module 4, a signal processing module 5, a data acquisition module 6, and a spherical support frame 7. The number of neutron detectors 1, time-position sensitive detector modules 2, and time-flight measurement modules 3 is 6n, where n≥1. The neutron detectors 1, time-position sensitive detector modules 2, and time-flight measurement modules 3 are uniformly fixed on the spherical support frame 7. The probes of the neutron detectors 1, time-position sensitive detector modules 2, and time-flight measurement modules 3 point towards the center of the spherical support frame. The synchronization trigger control module 4, signal processing module 5, and data acquisition module 6 are located outside the spherical support frame 7. The neutron detectors 1, time-position sensitive detector modules 2, and time-flight measurement modules 3 are electrically connected to the signal processing module 5 and the data acquisition module 6 respectively, and the neutron detectors 1, time-position sensitive detector modules 2, time-flight measurement modules 3, and data acquisition module 6 are electrically connected to the synchronization trigger control module 4.

[0029] Six n detection modules are uniformly fixed on a spherical support frame 7, which can capture the emission direction of neutrons from different angles, providing multidimensional data support for angular correlation distribution analysis. The nuclide under test undergoes heavy nucleus fission, which gradually splits into two fragments and emits fracture neutrons that tend to be isotropic. During the fragment acceleration phase, the fission fragments emit neutrons along the fission axis, resulting in an anisotropic distribution of neutrons emitted during the acceleration phase of the fission fragments. Neutron detector 1 receives the neutron signal, and the synchronization trigger control module 4 issues a synchronization trigger signal based on the detected neutron event, ensuring that all neutron detectors 1, time-position sensitive detector module 2, and time-flight measurement module 3 synchronously collect data on the same event. The signals from each neutron detector 1, time-position sensitive detector module 2, and time-flight measurement module 3 are amplified, filtered, and shaped by the signal processing module 5 to obtain clear signals, and these signals are transmitted to the data acquisition module 6. The data acquisition module 6 digitizes the processed signals, records the neutron energy, time, and angle information of each neutron event, and provides a complete dataset for subsequent analysis.

[0030] The technical solution of this application has the following technical effects: by adopting a structure in which multiple neutron detectors are evenly distributed, combined with a time position sensitive detector module and a time-flight measurement module, the energy, time, and angle information required for the neutron angle correlation distribution can be collected in a single measurement, and the equal sensitivity of the neutron signal from all directions is guaranteed. At the same time, the use of the synchronous trigger control module increases the system's response speed and synchronization accuracy, which can meet the accuracy and reliability of the overall measurement of neutron angle correlation distribution information.

Claims

1. A neutron angle correlation distribution information acquisition system, comprising: The system comprises a neutron detector, a time-position sensitive detector module, a time-flight measurement module, a synchronization trigger control module, a signal processing module, a data acquisition module, and a spherical support frame. Its features include: The number of neutron detectors, time-position sensitive detector modules, and time-flight measurement modules mentioned is 6. , The neutron detector, time-position sensitive detector module, and time-flight measurement module are uniformly fixed on the spherical support frame. The probes of the neutron detector, time-position sensitive detector module, and time-flight measurement module point towards the center of the spherical support frame. The synchronous trigger control module, signal processing module, and data acquisition module are set outside the spherical support frame. The neutron detector, the time-position sensitive detector module, and the time-flight measurement module are electrically connected to the signal processing module and the data acquisition module in sequence, respectively. The neutron detector, time-position sensitive detector module, time-flight measurement module, and data acquisition module are electrically connected to the synchronous trigger control module.

2. The neutron angle correlation distribution information acquisition system according to claim 1, characterized in that: The neutron detector, time-position sensitive detector module, and time-flight measurement module are uniformly fixed on the spherical support frame. A fixed point satisfies: , ,in Zenith angle, It is the azimuth angle.

3. The neutron angle correlation distribution information acquisition system according to claim 1, characterized in that: The neutron detector is a liquid scintillation detector, a helium-3 detector, or an aluminum boride detector.

4. The neutron angle correlation distribution information acquisition system according to claim 1, characterized in that: The data acquisition module includes a signal amplifier, an analog-to-digital converter, and a data processing unit.

5. The neutron angle correlation distribution information acquisition system according to claim 1, characterized in that: The time-position sensitive detector module is a multichannel time analyzer, a photon multiplier tube, a silicon photomultiplier tube, or a position-sensitive detector.

6. The neutron angle correlation distribution information acquisition system according to claim 1, characterized in that: The time-flight measurement module is a time-to-digital converter or a time-to-amplitude converter.

7. The neutron angle correlation distribution information acquisition system according to claim 1, characterized in that: The synchronous trigger control module is a function generator, allocation trigger, or logic analyzer.

8. The neutron angle correlation distribution information acquisition system according to claim 1, characterized in that: Shielding material is installed around the fixed points of the spherical support frame.

9. A neutron angle correlation distribution information acquisition system according to claim 8, characterized in that: The shielding material is lead or boride.

Images