CN210376708U - Neutron energy spectrum measuring system - Google Patents
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- CN210376708U CN210376708U CN201920499182.XU CN201920499182U CN210376708U CN 210376708 U CN210376708 U CN 210376708U CN 201920499182 U CN201920499182 U CN 201920499182U CN 210376708 U CN210376708 U CN 210376708U
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Abstract
The utility model provides a neutron energy spectrum measuring system, which belongs to the technical field of neutron energy spectrum measurement, and comprises a support, a neutron detector and N spherical cavities which are sleeved layer by layer from outside to inside, wherein N is an integer greater than or equal to 2, the support comprises a supporting seat and a bearing column connected with the supporting seat, the end part of the bearing column extends into the geometric center of the spherical cavity and is fixed with the Nth spherical cavity, and the bearing column is respectively connected with N-1 spherical cavities outside the Nth spherical cavity; each spherical cavity is formed by splicing at least one sub-cavity, and adjacent sub-cavities forming the same spherical cavity are fixed; the neutron detector comprises a first neutron detector and/or a second neutron detector, the first neutron detector is arranged at the geometric center of the Nth spherical cavity, the second neutron detectors comprise a plurality of second neutron detectors, and the plurality of second neutron detectors are distributed in the circumferential direction of any spherical cavity. The multifunctional portable detector can meet diversified detection requirements, detection equipment is highly integrated, portability is strong, and the application range is wide.
Description
Technical Field
The utility model relates to a neutron energy spectrum measures technical field, particularly, relates to a neutron energy spectrum measurement system.
Background
Neutron energy spectrum is an important property of a neutron source, and neutron energy spectrum measurement is significant for nuclear physics research. For example, measuring the energy spectrum of the nuclear reaction producing neutrons, information on the nuclear energy level can be obtained. Neutron spectral measurements are also important in neutron applications, such as designing and testing nuclear reactors and weapons, where the fission neutron spectrum of fissile elements, as well as the neutron spectrum within a power plant, needs to be known. When the neutron source is popularized and applied, the neutron source also relates to the neutron energy spectrum of the neutron source and the neutron energy spectrum in an experimental device.
As neutron energy spectrum measuring equipment, the Banner multisphere neutron energy spectrum measuring equipment is widely applied to neutron energy spectrum measurement in various fields due to the advantages of wide energy response range, isotropy, simple equipment operation and the like. However, most of the existing multi-ball systems adopt a plurality of slowing-down balls with different sizes for measurement, the instruments and equipment are complex, the manufacturing and measurement costs are high, and due to the fact that the different slowing-down balls are adaptive to limited measurement scenes, under the condition that the measurement requirements are high or the equipment is required to be carried for field measurement, the requirements for parts of the device and materials such as a slowing-down agent are high, and the neutron energy spectrum measurement system is not favorable for transportation, installation and use.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a neutron energy spectrum measurement system can provide manifold using-way, enlarges the application scope of device, simplifies the constitution of device, satisfies diversified and portable's demand.
The embodiment of the utility model is realized like this:
an aspect of the embodiment of the present invention provides a neutron energy spectrum measurement system, which includes a support, a neutron detector, and N spherical cavities that are sequentially sleeved from outside to inside, where N is an integer greater than or equal to 2, the support includes a support seat and a bearing column connected to the support seat, the end of the bearing column extends into the geometric center of the spherical cavity and is fixed to the nth spherical cavity, the bearing column is connected to N-1 spherical cavities outside the nth spherical cavity, and the support seat is used for providing stable support; each spherical cavity is formed by splicing at least one sub-cavity, adjacent sub-cavities forming the same spherical cavity are fixed, and a moderator is filled in the spherical cavity; the neutron detector comprises a first neutron detector and/or a second neutron detector, the first neutron detector is arranged at the geometric center of the Nth spherical cavity, the second neutron detectors comprise a plurality of second neutron detectors, and the plurality of second neutron detectors are arranged in the circumferential distribution of any spherical cavity.
Optionally, a communication channel is arranged between adjacent sub-cavities constituting the spherical cavity, and the liquid moderator filled in the spherical cavity can flow between the adjacent sub-cavities through the communication channel.
Optionally, the number of the second neutron detectors is 4, and the 4 second neutron detectors are uniformly distributed in the second spherical cavity along the circumferential direction.
Optionally, each spherical cavity is provided with an interface for filling the moderator.
Optionally, at least one spherical cavity sleeved outside the Nth spherical cavity is fixed to the connecting end of the bracket.
Optionally, the moderator comprises a granular, jelly-like, powdered or liquid substance; a jelly-like or liquid moderator is used to fill the spherical cavity between adjacent subchambers with communicating channels.
Optionally, the moderator comprises a primary moderator material and a secondary moderator material; the primary moderator material includes at least one of water, vegetable oil, boric acid, heavy water, graphite, boron, paraffin, lithium, and polyethylene, and the secondary moderator material includes at least one of heavy metals.
Optionally, the spherical cavity filled with the auxiliary moderator material comprises an integrally formed heavy metal spherical shell-shaped entity.
Optionally, the cavity material of the spherical cavity comprises at least one of a metal material, a non-metal material and an alloy material.
Optionally, a liquid channel is arranged on the side surface of the bearing column, a communicating channel is correspondingly arranged in the spherical cavity connected with the bearing column, and the liquid-like and gel-like moderator can be filled or pumped into or out of the spherical cavity through the liquid channel and the communicating channel.
The utility model discloses beneficial effect includes:
the embodiment of the utility model provides a neutron energy spectrum measurement system includes support, neutron detector and outside-in spherical cavity that layer by layer cover was established, N is more than or equal to 2 integer, and the support includes supporting seat and the heel post of being connected with the supporting seat, and the tip of heel post stretches into the geometric center of spherical cavity and is fixed with the spherical cavity of N, and the heel post is connected with N-1 spherical cavities outside the spherical cavity of N respectively, and the supporting seat is used for providing stable support, in order to guarantee the installation and the job stabilization nature of the neutron energy spectrum measurement system of the embodiment of the utility model; each spherical cavity is formed by splicing at least one sub-cavity, the adjacent sub-cavities forming the same spherical cavity are fixed, a moderator is filled in the spherical cavity, the same or different moderators can be filled in different spherical cavities and different sub-cavities of the same spherical cavity according to requirements so as to match with different neutron measurement requirements, and the measurable range of the neutron energy spectrum measurement system provided by the embodiment of the utility model is enlarged; the neutron detector comprises a first neutron detector and/or a second neutron detector, the first neutron detector is arranged at the geometric center of the Nth spherical cavity, the second neutron detectors comprise a plurality of second neutron detectors, the plurality of second neutron detectors are arranged in the circumferential distribution of any spherical cavity, the neutron detectors are integrated, and the measurement accuracy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a neutron spectrum measurement system provided in an embodiment of the present invention;
fig. 2 is a schematic view of a first neutron detector and a second neutron detector of the neutron spectrum measurement system provided by the embodiment of the present invention;
FIG. 3 is a graph of the effect of different thicknesses of heavy metal and polyethylene on the response matrix;
FIG. 4 is a graph of the effect of different modes of moderator material filling on response counts;
FIG. 5 is a graph of the effect of different concentrations of boric acid solution on the counting response.
Icon: 11-a support seat; 12-a heel post; 121-a liquid channel; 21-a first neutron detector; 22-a second neutron detector; 31-a first layer of spherical cavities; 32-a second layer of spherical cavities; 321-a sub-communication channel; 33-a third layer of spherical cavities; 34-a fourth layer of spherical cavities; 35-fifth layer spherical cavity.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present embodiment provides a neutron energy spectrum measurement system, which includes a support, a neutron detector, and N spherical cavities that are sleeved layer by layer from outside to inside, where N is an integer greater than or equal to 2, the support includes a support base 11 and a bearing column 12 connected to the support base 11, an end of the bearing column 12 extends into a geometric center of the spherical cavity and is fixed to the nth spherical cavity, the bearing column 12 is connected to N-1 spherical cavities outside the nth spherical cavity, and the support base 11 is configured to provide stable support; each spherical cavity is formed by splicing at least one sub-cavity, adjacent sub-cavities forming the same spherical cavity are fixed, each spherical cavity can be formed by one sub-cavity or a plurality of sub-cavities which are connected, the joints are fixed by a net-shaped support, the cavities are supported and communicated with the sub-cavities, and moderator is filled in the spherical cavity; the neutron detector comprises a first neutron detector 21 and/or a second neutron detector 22, the first neutron detector 21 is arranged at the geometric center of the Nth spherical cavity, the second neutron detectors 22 comprise a plurality of neutron detectors, and the plurality of second neutron detectors 22 are arranged in the circumferential distribution of any spherical cavity.
It should be noted that, firstly, the end of the bearing column 12 extends into the geometric center of the nth spherical cavity for fixing, and meanwhile, is sequentially connected with the other N-1 spherical cavities which are sleeved on the nth spherical cavity layer by layer, so as to ensure that each spherical cavity is connected and fixed. However, except that the Nth spherical cavity is fixedly connected with the bearing column 12, i.e. is not detachable, each of the N-1 spherical cavities except the Nth spherical cavity can be detached and separated, so that any one of the spherical cavities can be selectively installed for use or detached for standby application as required.
The second is used for filling the moderator in the spherical cavity, and spherical cavity can be for not filling the cavity state of moderator promptly, also can carry out and be full of the state after the moderator is filled, to the spherical cavity of a plurality of subchambers concatenation formation, can also set up partial subchamber filling moderator as required and be full of the state, and partial subchamber is the cavity state, and the mode that its cooperation was used is various, dismantles convenient to use. The utility model discloses neutron energy spectrum measurement system does not do all to do the injecing to quantity and shape etc. of concatenation sub-chamber that forms spherical cavity, for example, spherical cavity can only have a sub-chamber, and spherical cavity is a whole cavity promptly, or can be for forming by the concatenation of the eight parts spherical shell form sub-chamber of 8 rules, also can splice each other for the sub-chamber of other arbitrary irregular shapes, as long as guarantee that the spherical cavity that a plurality of sub-chamber concatenations formed is whole for globular and do not have the missing part can.
Thirdly, as shown in fig. 2, the neutron detector may only include the first neutron detector 21, or may include both the first neutron detector 21 and the second neutron detector 22, so that the neutron detectors are integrated, and the measurement accuracy is improved.
The utility model discloses among the neutron energy spectrum measurement system, do not do specific restriction to the quantity that sets up of second neutron detector 22, technical personnel in the field can carry out the setting of second neutron detector 22 quantity according to actual measurement needs, a plurality of second neutron detector 22 distribute in the circumference of spherical cavity, the example, a plurality of second neutron detector 22 can set up in same spherical cavity, also can set up in the spherical cavity of difference, when setting up in same spherical cavity, can be in the same subcavity of constituteing this spherical cavity, also can set up in different subcavities.
Fourth, the utility model discloses among the neutron energy spectrum measurement system, under the condition that spherical cavity is formed by the concatenation of a plurality of sub-chambeies, do not do specifically to the fixed mode of connection between a plurality of sub-chambeies and restrict, for example, accessible buckle forms can dismantle the relation of connection, or still can tie up for other and tie up, paste the connection methods commonly used such as, such setting can strengthen the flexibility and the suitability of this embodiment neutron energy spectrum measurement system, technical personnel in the art can set up the quantity of spherical cavity according to actual need, and install and dismantle it.
The embodiment of the utility model provides a neutron energy spectrum measurement system includes support, neutron detector and outside-in spherical cavity that layer by layer cover was established, N is more than or equal to 2 integer, and the support includes supporting seat 11 and the heel post 12 of being connected with supporting seat 11, and the tip of heel post 12 stretches into the geometric center of spherical cavity and is fixed with the spherical cavity of N, and heel post 12 is connected with N-1 spherical cavity outside the spherical cavity of N respectively, and supporting seat 11 is used for providing stable support, in order to guarantee the installation and the job stabilization nature of the neutron energy spectrum measurement system of the embodiment of the utility model; each spherical cavity is formed by splicing at least one sub-cavity, the adjacent sub-cavities forming the same spherical cavity are fixed, a moderator is filled in the spherical cavity, the same or different moderators can be filled in different spherical cavities and different sub-cavities of the same spherical cavity according to requirements so as to match with different neutron measurement requirements, and the measurable range of the neutron energy spectrum measurement system provided by the embodiment of the utility model is enlarged; the neutron detector comprises a first neutron detector 21 and/or a second neutron detector 22, the first neutron detector 21 is arranged at the geometric center of the Nth spherical cavity, the second neutron detector 22 comprises a plurality of second neutron detectors 22, the plurality of second neutron detectors 22 are arranged in the circumferential distribution of any spherical cavity, the neutron detectors are integrated, and the measurement accuracy is improved.
The spherical cavity is used for filling a moderator, the moderator filled in a plurality of sub-cavities forming the spherical cavity can be different, and different directions can be detected simultaneously in a special environment. Optionally, the moderator comprises a granular, jelly-like, powdered or liquid substance. When jelly-shaped or liquid moderator needs to be filled in the spherical cavity, a communication channel can be arranged between the adjacent sub-cavities forming the spherical cavity, so that the liquid moderator filled in the spherical cavity can flow between the adjacent sub-cavities through the communication channel, and the filling uniformity of the liquid moderator filled in the spherical cavity is ensured.
It should be noted that for granular or powdery moderator, can fill in the spherical cavity that is provided with the intercommunication passageway between the adjacent subcavities equally, in the neutron energy spectrum measurement system of the embodiment of the utility model, do not restrict and only can fill jelly form or liquid moderator in the spherical cavity that is provided with the intercommunication passageway between the adjacent subcavities.
Optionally, each spherical cavity is provided with an interface for filling a moderator.
Aiming at different measurement requirements and actual conditions of a measurement field, the type and the combined structure of the moderator required by neutron measurement can be combined and changed, in order to improve the portability and the safety of the neutron spectrum measurement system, the moderator such as boron-containing solution or particulate moderator which is inconvenient to operate at the measurement site can be pre-packaged in the corresponding spherical cavity before the neutron spectrum measurement system is conveyed to the radiation site, the spherical cavity can be directly measured after being transported to a measurement site, thereby avoiding the influence caused by the problems of site limitation, tool limitation, personnel limitation and the like, in order to improve the applicability of the neutron spectrum measurement system, a part of moderator which is convenient to operate on site can be transported to the site together with the device, so that the filling and the combined adaptive coordination can be carried out on the measurement site according to different measurement requirements. Optionally, at least one spherical cavity sleeved outside the nth spherical cavity is fixed to the connecting end of the bracket.
For example, as shown in fig. 1, that is, in the case of including 2 fixed spherical cavities from the inside to the outside, the two fixed spherical cavities are a fourth layer spherical cavity 34 and a fifth layer spherical cavity 35, respectively. The purpose of this is: in some specific measuring fields, the moderator in the fixed cavity can meet the measuring requirement without an outer detachable cavity, and the design reduces unnecessary assembly and disassembly; simultaneously, this design can be dismantled the cavity for the periphery and provide fixed anchor point, the stability of reinforcing structure.
Optionally, the moderator comprises a primary moderator material and a secondary moderator material; the primary moderator material includes at least one of water, vegetable oil, boric acid, heavy water, graphite, boron, paraffin, lithium, and polyethylene, and the secondary moderator material includes at least one of heavy metals.
The water, vegetable oil, boric acid, heavy water, graphite, paraffin and polyethylene have high hydrogen content, can effectively slow down low-energy neutrons, boron and lithium materials have larger thermal neutron reaction cross sections, so that the slow down water also can effectively slow down the neutrons, has the characteristic of threshold value absorption, can absorb the low-energy thermal neutrons, is beneficial to improving the resolution ratio of neutron dissociation spectra, can effectively slow down low-medium and high neutrons by using heavy metal auxiliary moderators in the cooperation of different main moderators, and widens the energy measurement range of the device. The moderator has two different physical forms of liquid and solid, can be filled and unloaded in a liquid mode and a solid mode, can change the filling mode of the moderator according to specific measurement occasions, enhances the applicability of the device, and improves the moderator type and the freedom degree of the filling mode of the device.
The moderator is also called a neutron moderator and is used for reducing neutron energy and increasing the material of the probability of the neutron and the material mutual reaction, and neutrons can react with the thermal neutron detector after being moderated into thermal neutrons by the moderator, thereby improving the detection efficiency of the detector. A good moderator should have the following properties: good nuclear characteristics, namely a large macroscopic scattering section sigma s of neutrons and a small macroscopic absorption section sigma a; good thermal conductivity, thermal stability and irradiation stability; the density is high; the corrosion effect on reactor core structural materials is small; the cost is low. Optionally, the spherical cavity filled with the auxiliary moderator material comprises an integrally formed heavy metal spherical shell-shaped entity.
When needs use the utility model discloses neutron energy spectrum measurement system carries out high energy neutron and surveys time measuring, need its energy detection upper limit of corresponding improvement in order to satisfy the detection demand, under this condition, can adopt integrated into one piece's heavy metal spherical shell shape entity as one deck or multilayer spherical cavity, as shown in fig. 1, when carrying out high energy neutron detection, set up the heavy metal spherical shell shape entity of 33 positions as integrated into one piece in third layer spherical cavity, there is threshold value reaction (n, xn) heavy metal material such as lead with the neutron, this reaction can increase the sensitivity of detector to high energy neutron, this property can be used to improve the energy upper limit that high energy neutron detected, thereby make the utility model discloses neutron energy spectrum measurement system can adaptability be used for high energy neutron detection experiment.
Alternatively, as shown in fig. 1, a liquid passage 121 is provided on the side of the load-bearing column 12, a communicating passage is provided corresponding to the spherical cavity connected to the load-bearing column 12, and the liquid-like and jelly-like moderators can be filled or pumped into the spherical cavity through the liquid passage 121 and the communicating passage.
A liquid channel 121 is reserved in the bearing column 12, the liquid channel 121 corresponds to a communication channel arranged between the adjacent sub-cavities in position, and the liquid channel can be used for filling and extracting a liquid moderator for the corresponding spherical cavity on a measurement site.
Optionally, the cavity material of the spherical cavity includes at least one of a metal material, a non-metal material and an alloy material.
The metal material has good rigidity and high strength; the non-metal material has strong toughness, corrosion resistance and high temperature resistance, part of non-metal such as polyethylene can be used as a moderator while serving as a structural material, the cost of the device can be reduced, the mechanical property and the wear resistance of the alloy material are good, and a proper material can be selected according to the arrangement position, the application and the use occasion of the spherical cavity. At least one of the above materials, or a combination of materials, may be selected.
The following is a detailed description of an example of determining the specific number and arrangement of spherical cavities. Illustratively, when N is 5, the neutron spectrum measurement system of this embodiment includes 5 spherical cavities, which are a first layer spherical cavity 31, a second layer spherical cavity 32, a third layer spherical cavity 33, a fourth layer spherical cavity 34, and a fifth layer spherical cavity 35 from outside to inside, and the cavities of each layer may be separated by respective shells of two adjacent layers of cavities, as shown in fig. 2, the first neutron detector 21 is disposed at a geometric center of the fifth layer spherical cavity 35, which is also a spherical center of the neutron spectrum measurement system, and can provide isotropic neutron response counting measurement, and the four second neutron detectors 22 are uniformly distributed in a circumferential direction of the second layer spherical cavity 32.
It should be noted that the first neutron detector 21 and the second neutron detector 22 may adopt the same detector structure and specific arrangement, and the difference is only that the arrangement positions are different.
One end of the bearing column 12 is connected with the supporting seat 11, the other end of the bearing column is connected to the fifth layer spherical cavity 35, a liquid channel 121 is arranged on the side face of the bearing column 12 and is respectively communicated with the first layer spherical cavity 31, the second layer spherical cavity 32, the third layer spherical cavity 33, the fourth layer spherical cavity 34 and the fifth layer spherical cavity 35, and a moderator can be filled or extracted into the spherical cavities through the liquid channel 121 and the communication channel during measurement.
The inner side of the first layer of spherical cavity 31 is connected with the outer side of the second layer of spherical cavity 32, and in order to reduce the weight of the shell and improve the strength, the shell material of the first layer of spherical cavity 31 can be made of plastic steel. In the measurement, the moderator in the first spherical cavity 31 can perform a moderating action on neutrons in the radiation field. The moderator material filling the first spherical cavity 31 can be granular or liquid, for example, the moderator is filled and encapsulated in the first spherical cavity 31 before the neutron spectrum measurement system of the embodiment is assembled, during measurement, the first spherical cavity 31 filled with the moderator is assembled on the neutron spectrum measurement system of the embodiment to form a complete moderator layer, the granular moderator can be high-density polyethylene particles or boron-containing polyethylene particles, the granular moderator is convenient to store and transport, if other liquid moderators such as boric acid solution are selected, the boric acid solution can be encapsulated in the corresponding spherical cavity in a laboratory in advance, and the risk of leakage is avoided.
In this embodiment, the sub-cavities of each spherical cavity may be filled with different moderators, for example, the first layer of spherical cavity 31, and the sub-cavities of the first layer of spherical cavity 31 may also be filled with different moderators, as shown in fig. 3 to 5, for example, solid polyethylene particles, graphite particles, borax particles, boron-containing polyethylene particles, water, vegetable oil, boric acid, heavy water, and lithium-containing solution are respectively filled, so that the moderation can be respectively performed on the incident neutrons in different directions. As shown in fig. 3, polyethylene with different thicknesses has different response counts for neutrons with different energies, and heavy metal (for example, tungsten) with different thicknesses has different response counts for neutrons with different energies, so that the moderation effect for neutrons with different energies can be achieved by changing the thickness of the same moderator material. As shown in fig. 4, in the same combination of moderator, such as polyethylene-heavy metal-polyethylene combination, heavy metals with different thicknesses will produce different response counts, and in the same combination of moderator materials, different structural orders will also produce different neutron response counts, so that the apparatus can obtain different neutron response counts through different heavy metals and different kinds of moderator, and different combination orders. As shown in fig. 5, different concentrations of boric acid solution will also produce different neutron response counts for neutrons of different energies, and thus different neutron response counts can be obtained by the concentration of boric acid solution.
The outside of the spherical cavity 32 of the second layer is connected with the inside of the spherical cavity 31 of the first layer, and the cavity of the spherical cavity 32 of the second layer needs to bear the pressure of the spherical cavity 31 of the first layer, so that the shell material of the spherical cavity 32 of the second layer is made of stainless steel materials and other materials with good bearing capacity, and meanwhile, the whole weight of the neutron energy spectrum measuring system is considered.
The communication channel arranged between the adjacent sub-cavities of the second layer of spherical cavity 32 is a sub-communication channel 321, and the sub-communication channel 321 communicates the sub-cavities forming the second layer of spherical cavity 32, so that the whole second layer of spherical cavity 32 can be filled with the liquid moderator as long as the liquid moderator is introduced into one of the sub-cavities. Meanwhile, a liquid channel 121 is arranged at the joint of the second layer of spherical cavity 32 and the bearing column 12 and is used for filling and extracting the liquid moderator from the second layer of spherical cavity 32 during measurement. The second layer of spherical cavities 32 may also be pre-filled with a solid moderator and then assembled in the same manner as the first layer of spherical cavities 31.
In the second layer of spherical cavity 32, 4 second neutron detectors 22 are located at different positions to form a single-sphere multi-detector measurement mode, under the same moderator combination, a plurality of neutron response counts are obtained, elements in a response matrix are increased, and the accuracy of neutron spectrum resolution is improved while the difficulty of spectrum resolution is reduced.
The outer side of the third layer of spherical cavity 33 is connected with the inner side of the second layer of spherical cavity 32, the inner side of the third layer of spherical cavity 33 is connected with the outer side of the fourth layer of spherical cavity 34, and when high-energy neutrons are measured, the third layer of spherical cavity 33 is an integrally formed heavy metal spherical shell-shaped entity, so that a cavity shell is not needed to be used as a container. When high-energy neutrons do not need to be measured, the heavy metal layer can be replaced by the cavity structure with the same size, the weight of the device is reduced, and the stability and the portability of the device are enhanced.
The heavy metal can be copper or tungsten, has good ductility and high thermal and electrical conductivity, is the most common material in cables and electric and electronic elements, can also be used as a building material, and can form a plurality of alloys. The copper alloy has excellent mechanical properties and very low resistivity. The tungsten has high hardness and high melting point, and is not corroded by air at normal temperature. Copper or tungsten are selected as heavy metal materials, the copper cost is low, the manufacturing cost of the device can be reduced, the weight of the device is reduced, and the device is easy to popularize and use while the portability of the device is enhanced. Tungsten has a higher density, can more effectively slow neutrons with higher energy, and can improve better device sensitivity in special high-energy neutron detection occasions.
This example selects for use the three-layer cavity of dismantling, outer spherical cavity 31 of first layer, the spherical cavity 32 of second layer and the spherical cavity 33 of third layer promptly, sets up the three-layer and can dismantle the cavity and basically can reach most experimental requirement and can not make this neutron energy spectrum measurement system's structure drag, and the practicality is strong.
Two layers of fixed cavities, namely a fourth layer of spherical cavities 34 and a fifth layer of spherical cavities 35, are selected for the present example. As shown in fig. 1, the middle of the fourth layer of spherical cavity 34 and the middle of the fifth layer of spherical cavity 35 are separated by a layer of shell material to form two spherical cavities, the two layers of spherical shells are both connected with the load-bearing column 12, a liquid channel 121 is reserved at the position where each layer of spherical cavity is connected with the load-bearing column 12, and the two layers of cavities are filled and extracted with moderator through the liquid channel 121 to form a moderator layer, so that incident neutrons are effectively moderated. This example selects two-layer fixed cavity for use, and when setting up two-layer fixed spherical cavity, fixed spherical cavity can be under the condition of the assembly of peripheral cavity and dismantlement not, through the moderator thickness change of two-layer fixed spherical cavity, combines the moderator solution of different concentrations, like boric acid solution above, can obtain different neutron response count and form response matrix. The device structure complexity is reduced, the weight of the device is greatly reduced, and more free space is provided for the use of the device.
The embodiment of the utility model provides a neutron energy spectrum measurement system can satisfy more diversified detection demands, has realized the high integration of detecting equipment, and the portability is strong, and is with low costs, application scope.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A neutron energy spectrum measurement system is characterized by comprising a support, a neutron detector and N spherical cavities sleeved layer by layer from outside to inside, wherein N is an integer greater than or equal to 2, the support comprises a support seat and a bearing column connected with the support seat, the end part of the bearing column extends into the geometric center of the spherical cavity and is fixed with the Nth spherical cavity, the bearing column is respectively connected with N-1 spherical cavities outside the Nth spherical cavity, and the support seat is used for providing stable support;
each spherical cavity is formed by splicing at least one sub-cavity, adjacent sub-cavities forming the same spherical cavity are fixed, and a moderator is filled in the spherical cavity; the neutron detector comprises a first neutron detector and/or a second neutron detector, the first neutron detector is arranged at the geometric center of the Nth spherical cavity, the second neutron detector comprises a plurality of second neutron detectors, and the second neutron detectors are arranged in a circumferential distribution mode of the spherical cavity.
2. The neutron energy spectrum measurement system of claim 1, wherein a communication channel is provided between adjacent sub-cavities that constitute the spherical cavity, and a liquid moderator filled in the spherical cavity can flow between the adjacent sub-cavities through the communication channel.
3. The neutron spectral measurement system of claim 1 or 2, wherein the second neutron detectors comprise 4, and 4 of the second neutron detectors are arranged circumferentially and uniformly in a second spherical cavity.
4. The neutron spectrum measurement system of claim 1 or 2, wherein each of the spherical cavities is provided with an interface for filling the moderator.
5. The neutron energy spectrum measurement system of claim 1, wherein at least one spherical cavity sleeved outside the nth spherical cavity is fixed to the connecting end of the bracket.
6. The neutron spectrum measurement system of claim 2, wherein the moderator comprises any one of a granular, jelly, powder, or liquid substance; the jelly-shaped or liquid moderator is used for filling a spherical cavity which is provided with a communication channel between the adjacent sub-cavities.
7. The neutron spectrum measurement system of claim 6, wherein the moderator comprises any one of a primary moderator material and a secondary moderator material; the main slowing-down material comprises any one of water, vegetable oil, boric acid, heavy water, graphite, boron, paraffin, lithium and polyethylene, and the auxiliary slowing-down material comprises any one of heavy metal materials.
8. The neutron spectrum measurement system of claim 7, wherein the spherical cavity filled with the auxiliary moderator material comprises an integrally formed heavy metal spherical shell shaped solid.
9. The neutron spectrum measurement system of claim 1, wherein the cavity material of the spherical cavity comprises any one of a metallic material, a non-metallic material, and an alloy material.
10. The neutron spectrum measurement system of claim 1, wherein a liquid channel is disposed on a side surface of the bearing column, a communication channel is disposed corresponding to the spherical cavity connected to the bearing column, and a liquid or jelly-like moderator can be sequentially filled or extracted into or from the spherical cavity through the liquid channel and the communication channel.
Priority Applications (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109901217A (en) * | 2019-04-11 | 2019-06-18 | 成都理工大学 | Neutron spectrum measurement system |
| CN111487669A (en) * | 2020-04-30 | 2020-08-04 | 成都理工大学 | Sleeve concentric multi-sphere neutron spectrometer, measuring method thereof and analysis processing system |
| CN111708076A (en) * | 2020-06-18 | 2020-09-25 | 中国工程物理研究院激光聚变研究中心 | Multichannel intelligent BF3Neutron yield monitor |
| CN112540397A (en) * | 2020-10-26 | 2021-03-23 | 南京即衡科技发展有限公司 | Wide-energy neutron dose equivalent rate instrument based on gamma ray energy spectrum detector |
| CN115607853A (en) * | 2022-10-12 | 2023-01-17 | 中子高新技术产业发展(重庆)有限公司 | Novel neutron regulation and control system and method |
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2019
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109901217A (en) * | 2019-04-11 | 2019-06-18 | 成都理工大学 | Neutron spectrum measurement system |
| CN111487669A (en) * | 2020-04-30 | 2020-08-04 | 成都理工大学 | Sleeve concentric multi-sphere neutron spectrometer, measuring method thereof and analysis processing system |
| CN111487669B (en) * | 2020-04-30 | 2022-03-01 | 四川轻化工大学 | Sleeve concentric multi-sphere neutron spectrometer, measuring method thereof and analysis processing system |
| CN111708076A (en) * | 2020-06-18 | 2020-09-25 | 中国工程物理研究院激光聚变研究中心 | Multichannel intelligent BF3Neutron yield monitor |
| CN111708076B (en) * | 2020-06-18 | 2022-04-22 | 中国工程物理研究院激光聚变研究中心 | Multichannel intelligent BF3Neutron yield monitor |
| CN112540397A (en) * | 2020-10-26 | 2021-03-23 | 南京即衡科技发展有限公司 | Wide-energy neutron dose equivalent rate instrument based on gamma ray energy spectrum detector |
| CN115607853A (en) * | 2022-10-12 | 2023-01-17 | 中子高新技术产业发展(重庆)有限公司 | Novel neutron regulation and control system and method |
| CN115607853B (en) * | 2022-10-12 | 2023-10-13 | 中子高新技术产业发展(重庆)有限公司 | Novel neutron regulation and control system and method |
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