CN202837557U - Cylindrical high-energy neutron probe - Google Patents
Cylindrical high-energy neutron probe Download PDFInfo
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- CN202837557U CN202837557U CN 201220361597 CN201220361597U CN202837557U CN 202837557 U CN202837557 U CN 202837557U CN 201220361597 CN201220361597 CN 201220361597 CN 201220361597 U CN201220361597 U CN 201220361597U CN 202837557 U CN202837557 U CN 202837557U
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Abstract
The utility model relates to a cylindrical high-energy neutron probe comprising a moderator with a cylindrical structure and a cylindrical <3>He or BF3 proportional counter arranged at the center of the moderator by a built-in way. The moderator includes an outermost layer (1) formed by employing polyethylene; an intermediate layer (2) made of lead metal is arranged at the inner surface of the outermost layer; and an innermost layer formed by employing polyethylene containing boron is arranged at the inner surface of the intermediate layer (2). Therefore, the high-energy neutron with 0.025eV to 1000MeV can be slowed down to thermal neutron energy region and can be combined with a cylindrical thermal neutron detector conveniently so as to form a high-energy neutron probe. The provided cylindrical high-energy neutron probe is suitable for measurement work high-energy neutrons with 0.025eV to 1000MeV and the high energy component in the neutron radiation field can be effectively measured; meanwhile, the original detection capacity for low energy component by an instrument is not changed fundamentally, so that the provided cylindrical high-energy neutron probe can be widely applied to neutron radiation monitoring work.
Description
Technical field
The utility model relates to the nuclear radiation detection technical field, is specifically related to a kind of probe for measuring high-energy neutron.
Background technology
Neutron measurement means commonly used mainly are to use thermal neutron detector at present, as
3The He counter,
6LiF, BF
3Counter etc., they have higher detection efficiency to thermal neutron, rising along with neutron energy, its detection efficiency can sharply descend, the reaction cross-section and the neutron speed that are they and neutron are inversely proportional to, and for energy being higher than the moderation of neutrons of 0.025eV, must use to contain the more material of light nucleus and make slow body, at present the most frequently used is the slow body that uses tygon to make, and the applicable neutron energy scope of this slow body generally is 0.025eV～20MeV.Therefore, the energy range that the neutron measurement means of commonly using at present are suitable for also is 0.025eV～20MeV.
The monitoring of common neutron monitoring instrument be energy at the neutron of thermal neutron～20MeV, what detector used generally all is thermal neutron detector, as
3The He counter,
6Li glass, BF
3Counter etc., these detectors have larger reaction cross-section to thermal neutron, rising along with neutron energy, its detection efficiency sharply descends, the reaction cross-section and the neutron speed that are they and neutron are inversely proportional to, in order to expand the energy response scope of instrument, common neutron monitoring instrument all uses single tygon slow body or tygon to add the Boron-containing-PE structure, in order to improve the detection efficiency of fast neutron, and when neutron energy during greater than 20MeV, reason owing to above-mentioned two kinds of tygon slow body structural volume aspects, slow body is not enough to moderation of neutrons to thermal neutron, the energy response of neutron monitoring instrument begins obvious decline, and departs from the response curve that International Commission on Radiological Protection (ICRP) is recommended.Therefore, when with the radiation field around the common neutron monitoring instrument measurement high energy acclerator, will inevitably cause underestimation in varying degrees.
The utility model content
For problems of the prior art, the purpose of this utility model is to provide a kind of cylindrical slow body, can be with the effective slowing down of the high-energy neutron of 0.025eV～1000MeV to pining for subzone, and can make up with columniform thermal neutron detector easily, the formation high-energy neutron is popped one's head in, and is applicable to the high-energy neutron surveying work of 0.025eV～1000MeV.
The utility model is to solve the problems of the technologies described above the technical scheme that adopts as described below:
A kind of cylindrical high-energy neutron probe, comprise slow body and proportional counter, it is characterized in that: described slow body is cylindrical structural, the outermost layer that comprises the tygon material, in the middle layer that outermost inside surface setting is made by lead metal, inside surface in the middle layer arranges the innermost layer of Boron-containing-PE material, the built-in proportional counter in the center of described slow body.
Further, described proportional counter is
3He or BF
3Proportional counter.
Further, described
3He or BF
3Proportional counter is cylindrical.
Further, described outermost radial thickness is 70-77mm, and the radial thickness in middle layer is 8-13mm, and the radial thickness of innermost layer is 17-25mm.
Further, the xsect radius in the interior cylindrical space of described innermost layer is 15mm.
Further, the cross-sectional diameter of described slow body is 220mm-260mm.
Further, the thickness of described outermost short transverse is 45-52mm, and the thickness of the short transverse in middle layer is 8-13mm, and the thickness of the short transverse of innermost layer is 7-15mm.
Further again, the length of described slow body is 240mm-280mm.
The beneficial effects of the utility model are as follows: the outermost layer of the utility model by being made by tygon in the outside surface setting of cylindrical slow body, in the middle layer that outermost inside surface setting is made by lead metal, the innermost layer of being made by Boron-containing-PE in the inside surface setting in middle layer, and built-in at the center of cylindrical slow body
3He or BF
3Proportional counter, therefore can be with the effective slowing down of the high-energy neutron of 0.025eV～1000MeV to pining for subzone, and can make up with columniform thermal neutron detector easily, formation high-energy neutron probe, be applicable to the high-energy neutron surveying work of 0.025eV～1000MeV, and can effectively measure the high energy composition in the Neutron Radiation Field, simultaneously, substantially do not change the original detectivity to the low energy composition of instrument, can be widely used in the Radiation monitoring work of neutron.
Description of drawings
Fig. 1 is the structural representation of cylindrical high-energy neutron probe of the present utility model.
Embodiment
Come the utility model is described below in conjunction with the drawings and specific embodiments.
The monitoring of common neutron monitoring instrument be energy at the neutron of thermal neutron～20MeV, what detector used generally all is thermal neutron detector, as
3The He counter,
6Li glass, BF
3Counter etc., these detectors have larger reaction cross-section to thermal neutron, rising along with neutron energy, its detection efficiency sharply descends, in order to expand the energy response scope of instrument, common neutron monitoring instrument all uses single tygon slow body or tygon to add the Boron-containing-PE structure, in order to improve the detection efficiency of fast neutron, and when neutron energy during greater than 20MeV, because above-mentioned two kinds of tygon slow body structural volume aspects, therefore slow body is not enough to moderation of neutrons to thermal neutron,, when with the radiation field around the common neutron monitoring instrument measurement high energy acclerator, will inevitably cause underestimation in varying degrees.
(n, xn) nuclear reaction of neutron and heavy metal belongs to threshold reaction, and take lead as example, neutron is 4MeV with the threshold value of (n, xn) nuclear reaction of lead.When neutron energy during less than 4MeV, lead layer is less on the impact of neutron, can ignore.When neutron energy during greater than 4MeV, because of (n, xn) reaction, neutron energy is reduced rapidly, reach the degree that can react with detector, therefore, the existence of lead layer can improve counter to the energy response of high-energy neutron.
When the lower neutron of energy passes through lead layer, with lead nuclear elastic scattering, not off-energy occur.Be that lead layer almost is transparent to low energy neutron, therefore, its existence can not affect the rem instrument to the original energy response of low energy neutron.When the neutron of higher-energy passes through lead layer, with lead nuclear effect generation inelastic scattering, part energy is passed to plumbous nuclear, thereby make the high-energy neutron slowing down to the energy quilt
3He or BF
3Proportional counter is recorded.So the existence of lead layer can improve the neutron measurement instrument to the energy response of high-energy neutron.
The utility model utilizes three kinds of materials of tygon, heavy metal, Boron-containing-PE to form the cylindrical slow bodies of ternary, the slow body center built-in one cylindrical
3He or BF
3Proportional counter, slow body and
3He or BF
3Proportional counter forms the high-energy neutron probe jointly.
As shown in Figure 1, cylindrical high-energy neutron probe of the present utility model comprises slow body and proportional counter, described slow body comprises outermost layer 1, in the middle layer 2 that the inside surface setting of outermost layer 1 is made by lead metal, 2 inside surface arranges innermost layer 3 in the middle layer, and the center of slow body is built-in
3He or BF
3 Proportional counter 4.
Slow body of the present utility model is cylindrical structural, is built in slowing down post center
3He or BF
3 Proportional counter 4 also is cylindrical, and the outermost layer 1 of slowing down post adopts tygon to make, and innermost layer 3 adopts Boron-containing-PE to make, and middle layer 2 is lead layer, adopts lead metal to make.Because slow body is cylindrical, so will be respectively describe from the short transverse of the radial direction of cylinder and the cylinder thickness to each layer, at first, the radial direction of cylinder: the radial thickness of outermost layer 1 is 70-77mm, the radial thickness in middle layer 2 is 8-13mm, the radial thickness of innermost layer 3 is 17-25mm, and the xsect radius in the interior cylindrical space of innermost layer 3 is 15mm, and the cross-sectional diameter of whole slow body is 220mm-260mm; Secondly, the short transverse of cylinder: the thickness of the short transverse of outermost layer 1 is 45-52mm, and the thickness of the short transverse in middle layer 2 is 8-13mm, and the thickness of the short transverse of innermost layer 3 is 7-15mm, and the length of whole cylinder slow body is: 240mm-280mm.
In practice should be according to circumstances, the careful structure of considering slow body and density of material, the concrete difference that becomes to grade, the thickness of each layer is available in above-mentioned scope.
In one embodiment, slowing down post of the present utility model, energy range is that neutron and the lead layer of 20MeV～1000MeV interacts, mode off-energy by inelastic collision, neutron energy is dropped to below the 20MeV, and the outermost layer that adopts tygon to make is made with the employing Boron-containing-PE and is entered after innermost layer further drops to 0.025eV with neutron energy
3He or BF
3Proportional counter, quilt
3He or BF
3Measurement procedure finished in the proportional counter record.
Use above-mentioned slowing down post high-energy neutron probe, can effectively measure the high energy composition in the Neutron Radiation Field, simultaneously, substantially do not change the original detectivity to the low energy composition of instrument, can be widely used in the Radiation monitoring work of neutron.
It should be noted that; above-mentioned specific embodiment only is exemplary; under above-mentioned instruction of the present utility model, those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion all drop in the protection domain of the present utility model.It will be understood by those skilled in the art that top specific descriptions just in order to explain the purpose of this utility model, is not for restriction the utility model.Protection domain of the present utility model is limited by claim and equivalent thereof.
Claims (8)
1. a cylindrical high-energy neutron is popped one's head in, comprise slow body and proportional counter, it is characterized in that: described slow body is cylindrical structural, the outermost layer (1) that comprises the tygon material, in the middle layer (2) that the inside surface setting of outermost layer (1) is made by lead metal, the inside surface of (2) arranges the innermost layer (3) of Boron-containing-PE material, the built-in proportional counter in the center of described slow body (4) in the middle layer.
2. a kind of cylindrical high-energy neutron according to claim 1 is popped one's head in, and it is characterized in that: described proportional counter (4) is
3He or BF
3Proportional counter.
3. a kind of cylindrical high-energy neutron probe according to claim 2 is characterized in that: described
3He or BF
3Proportional counter (4) is cylindrical.
4. a kind of cylindrical high-energy neutron according to claim 3 is popped one's head in, and it is characterized in that: the radial thickness of described outermost layer (1) is 70-77mm, and the radial thickness of middle layer (2) is 8-13mm, and the radial thickness of innermost layer (3) is 17-25mm.
5. a kind of cylindrical high-energy neutron according to claim 4 is popped one's head in, and it is characterized in that: the xsect radius in the interior cylindrical space of described innermost layer (3) is 15mm.
6. a kind of cylindrical high-energy neutron according to claim 5 is popped one's head in, and it is characterized in that: the cross-sectional diameter of described slow body is 220mm-260mm.
7. a kind of cylindrical high-energy neutron according to claim 3 is popped one's head in, it is characterized in that: the thickness of the short transverse of described outermost layer (1) is 45-52mm, the thickness of the short transverse in middle layer (2) is 8-13mm, and the thickness of the short transverse of innermost layer (3) is 7-15mm.
8. a kind of cylindrical high-energy neutron according to claim 7 is popped one's head in, and it is characterized in that: the length of described slow body is 240mm-280mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220361597 CN202837557U (en) | 2012-07-25 | 2012-07-25 | Cylindrical high-energy neutron probe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220361597 CN202837557U (en) | 2012-07-25 | 2012-07-25 | Cylindrical high-energy neutron probe |
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| CN202837557U true CN202837557U (en) | 2013-03-27 |
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| CN 201220361597 Expired - Fee Related CN202837557U (en) | 2012-07-25 | 2012-07-25 | Cylindrical high-energy neutron probe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104516023A (en) * | 2013-09-26 | 2015-04-15 | 中国辐射防护研究院 | 3He proportional counter neutron energy response compensation method via boron-containing polyethylene |
| CN104516008A (en) * | 2013-09-26 | 2015-04-15 | 中国辐射防护研究院 | 3He proportional counter neutron energy response compensation method via perforated cadmium sheet |
| CN104516022A (en) * | 2013-09-26 | 2015-04-15 | 中国辐射防护研究院 | Method for compensating neutron energy response of <3>He proportional counter through aluminum-lithium alloy |
| CN110320547A (en) * | 2018-03-30 | 2019-10-11 | 中国辐射防护研究院 | Integrated form wide-range gamma neutron detection device |
| CN115201891A (en) * | 2022-08-26 | 2022-10-18 | 兰州大学 | Long neutron counter |
-
2012
- 2012-07-25 CN CN 201220361597 patent/CN202837557U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104516023A (en) * | 2013-09-26 | 2015-04-15 | 中国辐射防护研究院 | 3He proportional counter neutron energy response compensation method via boron-containing polyethylene |
| CN104516008A (en) * | 2013-09-26 | 2015-04-15 | 中国辐射防护研究院 | 3He proportional counter neutron energy response compensation method via perforated cadmium sheet |
| CN104516022A (en) * | 2013-09-26 | 2015-04-15 | 中国辐射防护研究院 | Method for compensating neutron energy response of <3>He proportional counter through aluminum-lithium alloy |
| CN110320547A (en) * | 2018-03-30 | 2019-10-11 | 中国辐射防护研究院 | Integrated form wide-range gamma neutron detection device |
| CN115201891A (en) * | 2022-08-26 | 2022-10-18 | 兰州大学 | Long neutron counter |
| CN115201891B (en) * | 2022-08-26 | 2023-03-21 | 兰州大学 | Long neutron counter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20210725 |