CN202332321U - 14MeV neutron slowing-down material - Google Patents
14MeV neutron slowing-down material Download PDFInfo
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- CN202332321U CN202332321U CN2011204741404U CN201120474140U CN202332321U CN 202332321 U CN202332321 U CN 202332321U CN 2011204741404 U CN2011204741404 U CN 2011204741404U CN 201120474140 U CN201120474140 U CN 201120474140U CN 202332321 U CN202332321 U CN 202332321U
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- neutron
- 14mev
- slowing
- tungsten
- bundle
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Abstract
The utility model relates to a 14MeV neutron slowing-down material which is characterized in that: a 14MeV neutron is slowed down sequentially by three materials; first, tungsten (1) with strong 14MeV neutron slowing-down capacity, large thermal neutron absorption section and thickness of 3 centimeters is used for slowing down a 14MeV neutron bundle; then, lead (2) with weak 14MeV neutron slowing-down capacity, small thermal neutron absorption section and thickness of 14 centimeters is used for further slowing down the neutron bundle; finally, diamond (3) with relatively strong neutron slowing-down capacity, relatively small thermal neutron absorption section, relatively high density and thickness of 21 centimeters used for slowing down the neutron bundle; and a fast neutron ratio of the emitted neutron bundle is less than 3 percent. If the yield of a D-T neutron generator is 1,013n/s, the thermal neutron flux in a tumor position is up to 2.88* 109n/s; and the 14MeV neutron slowing-down material can be used for boron neutron capture therapy.
Description
Technical field
The utility model relates to a kind of 14MeV moderation of neutrons material, belongs to the Application of Nuclear Technology field.
Background technology
In boron neutron capture therapy (BNCT), the neutron flux of knub position need be greater than 10
9Cm
-2s
-1, the fast neutron ratio requires less than 3%.High yield D-T neutron howitzer has that price is low, volume is little, removable, close the advantage such as radiationless of having no progeny, be the best candidate's neutron source of BNCT.But its neutron energy is 14MeV, needs just can be used for BNCT after the slowing down.
Along with yield is 10
13The appearance of the D-T neutron generator of n/s, the slowing down of 14MeV neutron becomes the research focus.At present, moderation of neutrons material commonly used is water, graphite, heavy water, paraffin and tygon etc., and its shortcoming is that moderating efficiency is low, and the fast neutron ratio after the slowing down is difficult to less than 3%, even the yield of D-T neutron generator reaches 10
13N/s also can't satisfy the requirement of BNCT.
Summary of the invention
The purpose of the utility model provides a kind of 14MeV moderation of neutrons material, and technical matters to be solved is to improve its moderating efficiency, and making yield is 10
13The D-T neutron generator of n/s can be used for BNCT.
The technical scheme that the utility model adopts is: 14MeV moderation of neutrons material is to be made up of 3 kinds of materials, and the 1st kind of material is the thick tungsten of 3cm, and the 2nd kind of material is the thick lead of 4cm, and the 3rd kind of material is the thick man-made diamond fine grained of 21cm.
The design of the utility model the reasons are as follows:
The 14MeV fast neutron by the heavy metal inelastic scattering after, the energy of most of scattered neutrons is lower than 3MeV, the peak value of power spectrum is about 2MeV, this energy is the zone of protium slowing down best results.Therefore, heavy metal commonly used carries out slowing down to the 14MeV neutron, and then with the material that is rich in protium to its further slowing down.
Tungsten and lead all belong to heavy metal, and density is big, and the ability of slowing down fast neutron is strong.In addition, (n, 2n) reaction cross-section is bigger, can play proliferation function to neutron, helps improving thermal neutron flux, reduces the fast neutron ratio with plumbous for tungsten.
The density (19.35 * 10 of tungsten
3Kg/m
3) than plumbous (11.34 * 10
3Kg/m
3) big, the ability of slowing down fast neutron is strong, but its thermal neutron absorption cross section (11.0b) is much larger than plumbous (0.1b).Because the thermal neutron ratio is considerably less in the initial neutron beam, so the tungsten strong with the fast neutron moderating power, that thermal neutron absorption cross section is big carries out slowing down to it, the lead weak slightly with moderating power then, that absorption cross section is very little is to the further slowing down of neutron beam.When the peak value of neutron power spectrum was reduced to the 2MeV left and right sides, water, graphite, heavy water, paraffin or tygon carried out slowing down to it again.
Adamas and graphite are the allotropes of carbon, and its density is 3.50g/cm
3About, and the density of graphite has only 2.62g/cm
3So the effect of adamas degraded neutron should be better than graphite.Natural bulk adamas is very expensive, can select the man-made diamond fine grained for use, and density is about 3.20g/cm
3
The hydrogen richness that water, paraffin, tygon etc. are rich in the protium material is bigger, and the moderation of neutrons ability is strong, but the thermal neutron absorption cross section of its protium is bigger, and the MCNP analog result shows: even they and tungsten, plumbous combination also can't be used for BNCT.If the yield of D-T neutron generator is 10
13N/s, the plumbous 14MeV neutron beam with heavy water, graphite, its generation of adamas combination slowing down of tungsten, the highneutronflux that can access under less than 3% condition at the fast neutron ratio is followed successively by 3.09 * 10
9Cm
-2s
-1, 2.29 * 10
9Cm
-2s
-1With 2.88 * 10
9Cm
-2s
-1, all reached the requirement of BNCT.The slowing down effect of plumbous heavy water combination of tungsten and the plumbous adamas combination of tungsten obviously is better than the plumbous graphite combination of tungsten, so the utility model does not adopt the plumbous graphite combination of tungsten.Highneutronflux after the plumbous heavy water combination of the tungsten slowing down only makes up high by 7.3% than the plumbous adamas of tungsten, but the price of heavy water is higher than the man-made diamond fine grained far away, so the utility model adopts the plumbous adamas combination of tungsten slowing down 14MeV neutron.
The analog result of MCNP program shows, when tungsten, lead, when adamantine thickness is respectively 3cm, 14cm and 21cm, the slowing down effect of 14MeV moderation of neutrons material is best.
The beneficial effect of the utility model is to improve the moderating efficiency of 14MeV neutron effectively.If the yield of D-T neutron generator is 10
13N/s, the utility model can make the thermal neutron flux of knub position reach 2.88 * 10
9Cm
-2s
-1, and the ratio of fast neutron can satisfy the requirement of BNCT less than 3%.
Description of drawings
Further the utility model is described below in conjunction with accompanying drawing and embodiment.Fig. 1 is the sectional view of the utility model.
1. tungsten among the figure, 2. lead, 3. adamas.
Embodiment
In Fig. 1, tungsten (1), plumbous (2) closely are connected with adamas (3) successively.The 14MeV neutron beam at first gets in the thick tungsten of 3cm (1); Got into after the preliminary slowing down in the thick lead (2) of 14cm; After the peak value of its power spectrum is reduced to about 2MeV by plumbous (2), get in the thick adamas (3) of 21cm, when leaving adamas (3), the ratio of fast neutron is lower than 3%.If the yield of D-T neutron generator is 10
13N/s, the thermal neutron flux of knub position can reach 2.88 * 10
9Cm
-2s
-1
Claims (4)
1. 14MeV moderation of neutrons material is made up of tungsten, lead and 3 kinds of materials of adamas, and it is characterized in that: tungsten, lead and adamas closely link to each other successively.
2. 14MeV moderation of neutrons material according to claim 1 is characterized in that: the thickness of tungsten is 3cm, closely links to each other with lead.
3. 14MeV moderation of neutrons material according to claim 1 is characterized in that: plumbous thickness is 14cm, between tungsten and adamas.
4. 14MeV moderation of neutrons material according to claim 1 is characterized in that: adamantine thickness is 21cm, closely links to each other with lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204741404U CN202332321U (en) | 2011-11-25 | 2011-11-25 | 14MeV neutron slowing-down material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204741404U CN202332321U (en) | 2011-11-25 | 2011-11-25 | 14MeV neutron slowing-down material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202332321U true CN202332321U (en) | 2012-07-11 |
Family
ID=46444293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204741404U Expired - Fee Related CN202332321U (en) | 2011-11-25 | 2011-11-25 | 14MeV neutron slowing-down material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202332321U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799527A (en) * | 2019-03-11 | 2019-05-24 | 北京大学 | A kind of neutron spectrum measurement device and bonner sphere spectrometer system |
| CN110507915A (en) * | 2015-10-15 | 2019-11-29 | 南京中硼联康医疗科技有限公司 | The slow material of neutron |
-
2011
- 2011-11-25 CN CN2011204741404U patent/CN202332321U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110507915A (en) * | 2015-10-15 | 2019-11-29 | 南京中硼联康医疗科技有限公司 | The slow material of neutron |
| CN110507915B (en) * | 2015-10-15 | 2021-03-09 | 南京中硼联康医疗科技有限公司 | Neutron retarding material |
| CN109799527A (en) * | 2019-03-11 | 2019-05-24 | 北京大学 | A kind of neutron spectrum measurement device and bonner sphere spectrometer system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120711 Termination date: 20131125 |