CN110018513B - Neutron spectrometer with polyhedral structure - Google Patents
Neutron spectrometer with polyhedral structure Download PDFInfo
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- CN110018513B CN110018513B CN201910405950.5A CN201910405950A CN110018513B CN 110018513 B CN110018513 B CN 110018513B CN 201910405950 A CN201910405950 A CN 201910405950A CN 110018513 B CN110018513 B CN 110018513B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
Abstract
The invention belongs to the technical field of radiation measurement, and discloses a neutron spectrometer with a polyhedral structure, which comprises a detector (1) and a slowing body (2) arranged outside the detector (1), wherein the slowing body (2) comprises a plurality of sub-slowing bodies (21), the plurality of sub-slowing bodies (21) are outwards divergently arranged by taking the detector (1) as an endpoint, and the plurality of sub-slowing bodies (21) have a plurality of different thicknesses. The neutron spectrometer with the polyhedral structure provided by the invention can change the thickness of a moderated body according to the requirement, and has a simple structure without considering the sealing problem of liquid.
Description
Technical Field
The invention relates to the technical field of radiation measurement, in particular to a neutron spectrometer with a polyhedral structure.
Background
Neutron radiation measurement and protection are increasingly receiving attention as neutron technology is applied and developed at high speed in the fields of leading-edge basic research, nuclear energy, nuclear weapons, medicine, industry, agriculture and the like. The neutron radiation effect of workplaces is often described by the dose equivalent around neutrons, which is closely related to the fluence and energy of neutrons; in particular, the energy, the same fluence and different energies of neutrons contribute differently to the dose, which makes neutron spectroscopy important in radiation protection dose measurement. The term "neutron spectrum" refers to the fluence of neutrons of different energiesThe distribution statistical spectrum along with neutron energy E is also called as neutron fluence-energy distribution spectrum. Neutron energies of general interest range from 10 -9 About 20MeV, which is divided into: fast neutrons (> 100 keV), slow neutrons (i.e. medium energy neutrons, 0.5 eV-100 keV), thermal neutrons (about 0.025 eV) and cold neutrons (< 0.005 eV).
Can use the material with larger reaction cross section with thermal neutrons 3 He、 6 LiF、BF 3 And the device is manufactured into a thermal neutron detector for neutron spectrum measurement, and has higher detection efficiency on thermal neutrons. However, as neutron energy increases, the reaction cross section decreases and its detection efficiency decreases dramatically. The moderating body is made of materials containing more light nuclei, and is coated on the surface of the thermal neutron detector, so that high-energy neutrons can be moderated into thermal neutrons, and the detection efficiency of the high-energy neutrons is improved. The main method for neutron spectrum measurement by using the moderating body to cover the thermal neutron detector is a multi-sphere spectrometer method, which consists of the thermal neutron detector and a plurality of spherical moderating bodies with different thicknesses. Conventional multi-ball neutron spectrometer structure is like patent application CN201710201494.3, record a take out concentric ball device of water injection multilayer and neutron spectrum detecting system, this take out concentric ball device of water injection multilayer includes neutron detector, a plurality of shells that overlap in proper order from inside to outside and take out water injection device, the shell cover of the inlayer is established on neutron detector's surface in the shell, be formed with the clearance that is used for holding liquid between two arbitrary adjacent shells, the shell adopts the aluminum material to make, every casing outside the shell of inlayer all is provided with the valve, take out the water injection device and connect gradually the valve of every casing outside the shell of inlayer so that water injection or the drainage in the clearance. The multi-sphere neutron spectrometer has the advantages that the multi-layer shell needs to be sequentially injected or drained, the requirement on the liquid tightness of the device is too high, and the mode of changing the slowing body is complex.
Based on the above, it is necessary to design a neutron spectrometer detection device that can solve the above problems.
Disclosure of Invention
The invention aims at: the neutron spectrometer with the polyhedral structure can change the thickness of the moderated body according to the requirement, and has a simple structure without considering the sealing problem of liquid.
To achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a neutron spectrometer of polyhedral structure, includes the detector and sets up the outer moderating body of detector, the moderating body includes a plurality of sub-moderating bodies, and is a plurality of the sub-moderating body regard the detector as the terminal point outwards diverges the setting, and a plurality of the sub-moderating body has multiple different thickness.
Specifically, the sub-moderator is connected to the detector. The thickness of the sub-moderating body refers to the distance from the outer end face of the sub-moderating body to the center of the detector, the outer end face of the sub-moderating body is the end face of the sub-moderating body, which is far away from one end of the center of the detector, and neutron beams enter the sub-moderating body from the outer end face of the sub-moderating body.
The plurality of sub-moderating bodies have a plurality of different thicknesses, and each sub-moderating body has a thickness different from the thicknesses of the other sub-moderating bodies, i.e. the number of the sub-moderating bodies has a thickness similar to the number of the sub-moderating bodies, such as N sub-moderating bodies having N thicknesses; or,
the thicknesses of at least two sub-moderating bodies are the same and the thicknesses of the same are different from those of other sub-moderating bodies, namely the number of thickness types of the sub-moderating bodies is more than one but less than the number of the sub-moderating bodies, such as N sub-moderating bodies, and the sub-moderating bodies have M thicknesses, wherein M is 1< M < N.
Preferably, the plurality of sub-moderating bodies have a plurality of different thicknesses, and each of the sub-moderating bodies has a thickness different from that of the other sub-moderating bodies.
As a preferable technical scheme, the neutron spectrometer further comprises a driving device, and the driving device drives the moderating body to rotate so as to enable the moderating bodies with different thicknesses to face the incidence direction of the neutron beam.
Specifically, when the moderating body rotates, the position of the detector remains unchanged, i.e., the position of the detector relative to the neutron beam source remains unchanged.
As a preferable technical scheme, the slowing body is of a multi-surface cylindrical structure, the detector is arranged on the rotation axis of the slowing body, and the outer end face of the sub-slowing body is parallel to the rotation axis of the slowing body.
Specifically, the high-voltage line and the signal outgoing line of the detector penetrate out of the upper end face or the lower end face of the slowing body.
Preferably, the distances from the outer end surfaces of the plurality of sub-moderating bodies to the rotation axes of the moderating bodies are different, that is, the thicknesses of the plurality of sub-moderating bodies are different.
Preferably, the included angle between any two adjacent sub-slowing bodies is the same, i.e. a plurality of sub-slowing bodies are equiangularly arranged outside the detector.
As a preferable technical scheme, the outer end face of the sub-moderating body is a cylindrical surface.
Specifically, the central axis of the cylinder where the cylindrical surface is located is the rotation axis of the slowing body.
As a preferable technical scheme, the driving device is a stepping motor, and an output shaft of the stepping motor is positioned on a rotation axis of the slowing body and is fixedly connected with the slowing body.
Specifically, when the stepping motor rotates by a preset angle, the slowing body rotates once, so that the sub-slowing body with the other thickness faces the neutron beam incidence direction, and the sub-slowing bodies with different thicknesses are transformed to face the neutron beam incidence direction.
As a preferable technical scheme, the slowing body comprises a plurality of spherical bodies taking the center of the detector as the center of sphere, each sub-slowing body comprises one spherical body, and the spherical bodies are similar in shape, equal in solid angle and unequal in radius.
Specifically, the radius of the spherical body is the distance from the outer end surface, which is the spherical surface of the spherical body, to the center of the detector. The radius of the spherical bodies is different, namely the thicknesses of the sub-moderating bodies are different.
As a preferable technical scheme, the slowing body further comprises a polyhedral frame, the detector is located at the center of the polyhedral frame, the surface of the polyhedral frame is polygonal, a cavity is arranged between each polygon and the detector, and each spherical body is arranged in one cavity.
Preferably, the polyhedral frame comprises a barrier layer disposed between the cavities, the spherical bodies being separated from each other by the barrier layer.
As a preferable technical scheme, the polyhedral frame is a regular dodecahedron frame, and the surface of the regular dodecahedron frame is twelve regular pentagons.
Preferably, one of the regular pentagons of the regular dodecahedron frame is a leading-out surface, a sub-slowing body is not arranged in a cavity corresponding to the leading-out surface, a high-voltage wire and a signal leading-out wire of the detector penetrate out of the leading-out surface, and the driving device is fixedly connected with the regular dodecahedron frame at the leading-out surface. The surface of the regular dodecahedron frame, which is opposite to the leading-out surface, is an idle surface, and no sub-slowing body is arranged in the idle surface.
As a preferred technical scheme, drive arrangement includes first bracing piece, second bracing piece, arc rack, first motor, second motor, first gear, second gear, third gear, rail fixing groove and rail fixing stick, first bracing piece upper end with slowing body fixed connection, the lower extreme of first bracing piece with the second bracing piece rotates to be connected, first bracing piece second bracing piece and the detector is located same axis, second bracing piece lower extreme with rail fixing stick fixed connection, rail fixing stick lower extreme with first gear rotates to be connected, first gear with arc rack meshes, the arc rack sets up in use the detector center is on the circumference of centre of a circle, rail fixing stick slides and sets up in the rail fixing inslot, the rail fixing groove sets up in use the detector center is on another circumference of centre of a circle, first motor drive first gear rotates, the second motor is fixed to be set up on the second bracing piece, the second gear is installed to the second gear is in the second gear is installed on the second pivot.
The beneficial effects of the invention are as follows: the neutron spectrometer with the polyhedral structure can change the thickness of the moderated body according to the requirement, and has a simple structure without considering the sealing problem of liquid.
Drawings
FIG. 1 is a schematic diagram of a slowing body according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a slowing body according to an embodiment of the present invention;
FIG. 3 is a schematic view of a longitudinal section of a moderator according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the thickness and the included angle of the sub-moderator according to the first embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a connection between a slowing body and a driving device according to a first embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a sub-moderator according to a second embodiment of the present invention;
FIG. 8 is a schematic diagram of a sub-retarder according to another embodiment of the present invention;
FIG. 9 is a schematic view of a polyhedral frame according to a second embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating a usage status of a second embodiment of the present invention;
fig. 11 is a schematic diagram illustrating another usage status of the second embodiment of the present invention.
The detector 1, the slowing body 2, the sub-slowing body 21, the polyhedral frame 22, the polygon 221, the cavity 222, the driving device 3, the first supporting rod 31, the second supporting rod 32, the arc-shaped rack 33, the rail fixing rod 34, the second motor 35, the first gear 36, the second gear 37, the third gear 38 and the rail fixing groove 39.
Detailed Description
For a further understanding and appreciation of the structural features and advantages achieved by the present invention, the following description will be presented in conjunction with the accompanying drawings, in which:
example 1
As shown in fig. 1 to 3, the neutron spectrometer with a polyhedral structure comprises a detector 1 and a slowing body 2 arranged outside the detector 1, wherein the slowing body 2 comprises a plurality of sub-slowing bodies 21, the plurality of sub-slowing bodies 21 are arranged in a divergent mode outwards by taking the detector 1 as an end point, and the plurality of sub-slowing bodies 21 have different thicknesses.
In this embodiment, as shown in fig. 5, the neutron spectrometer further includes a driving device 3, and the driving device 3 drives the moderating body 2 to rotate so that the sub moderating bodies 21 with different thicknesses face the incident direction of the neutron beam.
In the present embodiment, as shown in fig. 1 to 3, the slowing body 2 has a polygonal cylindrical structure, and as shown in fig. 5, the detector 1 is disposed on the rotation axis of the slowing body 2, and the outer end surface of the sub-slowing body 21 is parallel to the rotation axis of the slowing body 2.
In this embodiment, as shown in fig. 2, the outer end surface of the sub-moderator 21 is a cylindrical surface.
In this embodiment, the driving device 3 is a stepper motor, and as shown in fig. 5, an output shaft of the stepper motor is located on the rotation axis of the slowing-down body 2 and is fixedly connected with the slowing-down body 2.
In this embodiment, the slowing body 2 includes six sub-slowing bodies 21 with different thicknesses, as shown in fig. 1 to 4, and for convenience of description, the thicknesses of the six sub-slowing bodies 21 are sequentially numbered as S1, S2, S3, S4, S5, S6, and S1 to S6 are sequentially increased, and as shown in fig. 4, the thicknesses of the sub-slowing bodies S1, S2, S3, S4, S5, S6 are respectively L1, L2, L3, L4, L5, L6, and L1< L2< L3< L4< L5< L6. In this embodiment, the thickness of each sub-moderating body is different from the thicknesses of the other sub-moderating bodies, and the six sub-moderating bodies have six thicknesses.
In other embodiments, the plurality of sub-moderators have a plurality of different thicknesses, but two or more of the sub-moderators are allowed to have the same thickness, e.g., six sub-moderators have five, four, three, or two different thicknesses.
In this embodiment, the plurality of sub-moderating bodies 21 are uniformly distributed outside the detector 1, and the included angles between any two adjacent sub-moderating bodies 21 are the same, as shown in fig. 4, six sub-moderating bodies 21 are uniformly distributed outside the detector 1, and the included angles between two adjacent sub-moderating bodies 21 are all 60 °.
In this embodiment, a connection mechanism (not shown) that can be fixedly connected to an output shaft of the stepper motor is fixedly disposed at the lower end of the slowing body 2, and the object to be rotated (the object to be rotated in this embodiment is a slowing body) is connected and driven by the stepper motor to rotate, which is a conventional technical means in the art and will not be described herein. When the stepping motor drives the slowing body 2 to rotate, the position of the detector 1 is kept unchanged, and the preset rotation angle of the stepping motor is 60 degrees each time. When the neutron spectrometer is in an initial state, S1 is opposite to the neutron beam to be measured, the thickness of the outer slowing-down body of the detector 1 is equal to the thickness of S1, after one measurement is completed, the stepping motor rotates by 60 degrees, the slowing-down body 2 rotates anticlockwise by 60 degrees, S2 is opposite to the neutron beam to be measured, at the moment, the thickness of the outer slowing-down body of the detector 1 is equal to the thickness of S2, namely, the conversion of the thickness of the outer slowing-down body of the detector 1 is completed, and the stepping motor is rotated again until neutron measurement is completed.
In other embodiments, the included angle between any two adjacent sub-moderating bodies is different, the driving device selects a stepping motor or other motors, and each rotation angle of the motors is set according to the actual included angle between the two adjacent sub-moderating bodies, so that when the driving device drives the moderating bodies to rotate once, the other adjacent sub-moderating bodies just face the neutron beam.
In other embodiments, the moderator 2 may be provided with n sub-moderators 21 of different thicknesses, where n is 4, 5, 7, 8, 9, 10, 11, 12 or more, as desired.
Example two
As shown in fig. 6 to 11, the neutron spectrometer with a polyhedral structure comprises a detector 1 and a slowing body 2 arranged outside the detector 1, wherein the slowing body 2 comprises a plurality of sub-slowing bodies 21, the plurality of sub-slowing bodies 21 are arranged in a divergent mode outwards by taking the detector 1 as an end point, and the plurality of sub-slowing bodies 21 have different thicknesses.
In this embodiment, as shown in fig. 6, the neutron spectrometer further includes a driving device 3, and the driving device 3 drives the moderating body 2 to rotate so that the sub moderating bodies 21 with different thicknesses face the incident direction of the neutron beam.
In this embodiment, as shown in fig. 6 to 11, the slowing body 2 includes a plurality of spherical bodies with the center of the detector 1 as the center, and each sub-slowing body 21 includes a spherical body, as shown in fig. 7 to 8, the plurality of spherical bodies are similar in shape, have equal solid angles and have unequal radii.
In this embodiment, as shown in fig. 6, the slowing body 2 further includes a polyhedral frame 22, the probe 1 is located at the center of the polyhedral frame 22, as shown in fig. 9, the surface of the polyhedral frame 22 is a polygon 221, a cavity 222 is disposed between each polygon 221 and the probe 1, and each spherical body is disposed in one cavity 222.
In this embodiment, as shown in fig. 9, the polyhedral frame 22 is a regular dodecahedron frame, and the surface of the regular dodecahedron frame is twelve regular pentagons.
In this embodiment, as shown in fig. 6, the driving device 3 includes a first supporting rod 31, a second supporting rod 32, an arc-shaped rack 33, a first motor (not shown), a second motor 35, a first gear 36, a second gear 37, a third gear 38, a track fixing groove 39 and a track fixing rod 34, wherein the upper end of the first supporting rod 31 is fixedly connected with the slowing body 2, the lower end of the first supporting rod 31 is rotatably connected with the second supporting rod 32, the first supporting rod 31, the second supporting rod 32 and the detector 1 are located on the same axis, the lower end of the second supporting rod 32 is fixedly connected with the track fixing rod 34, the lower end of the track fixing rod 34 is rotatably connected with the first gear 36, the first gear 36 is meshed with the arc-shaped rack 33, the arc-shaped rack 33 is arranged on a circumference taking the center of the detector 1 as a center, the track fixing rod 34 is slidably arranged in the track fixing groove 39, the track fixing groove 39 is arranged on another circumference taking the center of the detector 1 as a center, the first motor (not shown) drives the first gear 36 to rotate, the second motor 35 is fixedly arranged on the second supporting rod 32, the lower end of the second motor 32 is rotatably connected with the second gear 35, the second gear 37 is fixedly arranged on the third gear 37, and the third gear 37 is meshed with the third gear 38.
In this embodiment, the slowing body 2 includes 10 sub-slowing bodies 21 with different thicknesses, that is, 10 spherical bodies, the regular dodecahedron frame has 10 cavities 222, except for the lowest end surface and the uppermost end surface, no cavity is provided, one spherical body is respectively provided in the rest cavities 222, the uppermost end surface of the regular dodecahedron frame is an idle surface, the lowest end surface is a leading-out surface, a leading-out hole (not shown) is provided on the leading-out surface, and the high-voltage line and the signal line of the detector 1 are led out from the leading-out hole. The upper end of the first supporting rod 31 is fixedly connected with the leading-out surface of the slowing body 2.
As shown in fig. 6, the arc-shaped rack 33 and the track-fixing groove 39 are fixedly installed, and the first motor (not shown) can drive the first gear 36 to rotate and move along the arc-shaped rack 33, so that the first support bar 31, the second support bar 32 and the slowing body 2 rotate around the detector 1 as a circle center. The second motor 35 can drive the first support rod 31 to rotate, so that the slowing body 2 rotates by taking the first support rod 31 as a rotating shaft. When the first gear 36 moves along the arc-shaped rack 33, the rail fixing rod 34 moves synchronously along the arc-shaped track in the rail fixing groove 39, so-called rail fixing, namely, a fixed moving track, which has the function of enabling the whole neutron spectrometer to swing left and right (left swing is negative and right swing is positive) by taking the geometric center of the detector 1 as the center, and the geometric center of the detector 1 is always kept at the same horizontal position.
When the incidence direction of the neutron beam is fixed, or the neutron spectrometer in the embodiment is in a fixed neutron field, the mode of transforming the moderating bodies with different thicknesses (from thin to thick) is as follows:
(1) When the neutron spectrometer of this embodiment is installed, as shown in fig. 6, in the initial state after the neutron spectrometer of this embodiment is installed, one side of the regular pentagonal boundary of the extraction surface is parallel to the neutron beam shown in fig. 6, and the first support rod 31 is in the state when the first support rod is in the vertical position, at this time, the extraction surface faces directly below, and the idle surface faces directly above. The inside angle of the regular pentagon is 108 °, and the dihedral angle of the regular dodecahedron frame is about 116.57 °, so that the slowing body 2 is controlled to rotate clockwise by 18 ° about the first support rod 31 (18 ° in the initial state, the clockwise is the rotation direction of the slowing body in the top view state, and the same applies below), and the first support rod 31 and the second support rod 32 swing leftwards by 26.57 ° (at this time, the first support rod 31 is at-26.57 ° in its initial state), so that the lower left side SA in the initial state shown in fig. 6 rotates to a position perpendicular to the neutron beam incident direction, that is, the state shown in fig. 10. Taking a spherical body with normal incidence of neutrons in the state as a first moderating body, and carrying out first neutron measurement;
(2) Referring to fig. 10, when the first support bar 31 and the second support bar 32 are at-26.57 ° of their initial states (when the first support bar 31 and the second support bar 32 are swung to the left by 26.57 ° in the initial states), the slowing body 2 is rotated by 90 °, 162 °, -126 °, -54 ° (the rotation angle of the slowing body 2 around the first support bar 31 is positive clockwise and negative counterclockwise) in turn, corresponding to the second, third, fourth, and fifth slowing bodies, respectively;
(3) Referring to fig. 11, when the first support bar 31 and the second support bar 32 are at 26.57 ° of their initial states (when the first support bar 31 and the second support bar 32 are swung to the right at 26.57 ° in the initial states), the rotation detector 1 is sequentially rotated to 54 °, 126 °, -162 °, -90 °, -18 ° (the rotation angle of the slowing body 2 around the first support bar 31 is positive clockwise and negative counterclockwise) corresponding to the sixth, seventh, eighth, ninth, and tenth slowing bodies, respectively;
(4) After the ten neutron measurements corresponding to the ten moderating bodies are completed, the initial state of the neutron spectrometer can be restored.
The parts not related to the present invention are the same as or can be implemented by using the prior art, and are not described herein.
Finally, it should be noted that: in the description of the present invention, technical terms such as "center", "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "vertical", "horizontal", etc. refer to directions or positional relationships based on the directions or positional relationships shown in the drawings, only for convenience of description and understanding of the technical solution of the present invention, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; while the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications may be made to the techniques described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A neutron spectrometer with a polyhedral structure, which comprises a detector (1) and a slowing body (2) arranged outside the detector (1), and is characterized in that the slowing body (2) comprises a plurality of sub-slowing bodies (21), the plurality of sub-slowing bodies (21) are arranged in a divergent mode outwards by taking the detector (1) as an end point, and the plurality of sub-slowing bodies (21) have a plurality of different thicknesses; the neutron spectrometer further comprises a driving device (3), wherein the driving device (3) drives the moderating body (2) to rotate so as to enable the sub moderating bodies (21) with different thicknesses to face the incidence direction of the neutron beam; the slowing body (2) is of a multi-face cylindrical structure, the detector (1) is arranged on the rotation axis of the slowing body (2), and the outer end face of the sub-slowing body (21) is parallel to the rotation axis of the slowing body (2); the slowing body (2) comprises a plurality of spherical bodies taking the center of the detector (1) as the center of sphere, each sub-slowing body (21) comprises one spherical body, and the spherical bodies are similar in shape, equal in solid angle and unequal in radius; the slowing body (2) further comprises a polyhedral frame (22), the detector (1) is positioned at the center of the polyhedral frame (22), the surface of the polyhedral frame (22) is a polygon (221), a cavity (222) is arranged between each polygon (221) and the detector (1), and each spherical body is arranged in one cavity (222)
2. The polyhedral neutron spectrometer according to claim 1, wherein the outer end surface of the sub-moderating body (21) is cylindrical.
3. The polyhedral neutron spectrometer according to claim 1, wherein the driving device (3) is a stepper motor, and the output shaft of the stepper motor is located on the rotation axis of the slowing body (2) and is fixedly connected with the slowing body (2).
4. The neutron spectrometer of claim 1, wherein the polyhedral frame (22) is a regular dodecahedron frame, and the surface of the regular dodecahedron frame is twelve regular pentagons.
5. The neutron spectrometer with the polyhedral structure according to claim 1, wherein the driving device (3) comprises a first supporting rod (31), a second supporting rod (32), an arc-shaped rack (33), a first motor, a second motor (35), a first gear (36), a second gear (37), a third gear (38), a rail fixing groove (39) and a rail fixing rod (34), the upper end of the first supporting rod (31) is fixedly connected with the slowing body (2), the lower end of the first supporting rod (31) is rotatably connected with the second supporting rod (32), the first supporting rod (31), the second supporting rod (32) and the detector (1) are positioned on the same axis, the lower end of the second supporting rod (32) is fixedly connected with the rail fixing rod (34), the lower end of the rail fixing rod (34) is rotatably connected with the first gear (36), the first gear (36) is meshed with the arc-shaped rack (33), the detector (33) is arranged on the circumference of the rail fixing groove (39) on the circle center of the arc-shaped rack (34), the other circle is arranged on the circumference of the arc-shaped rack (39) in the center groove (1), the second motor (35) is fixedly arranged on the second supporting rod (32), the second gear (37) is arranged on the rotating shaft of the second motor (35), the third gear (38) is fixedly arranged on the first supporting rod (31), and the second gear (37) is meshed with the third gear (38).
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|---|---|---|---|---|
| CN112763243A (en) * | 2020-12-03 | 2021-05-07 | 中国航天科工集团第二研究院 | Near-earth space multi-energy band neutron radiation environment simulation system and method |
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