CN1940597A - Fusion neutron flux monitor - Google Patents
Fusion neutron flux monitor Download PDFInfo
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- CN1940597A CN1940597A CN 200510105645 CN200510105645A CN1940597A CN 1940597 A CN1940597 A CN 1940597A CN 200510105645 CN200510105645 CN 200510105645 CN 200510105645 A CN200510105645 A CN 200510105645A CN 1940597 A CN1940597 A CN 1940597A
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- fission chamber
- neutron
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- detector
- fusion
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Abstract
A monitor of fusion neutron flux is formed by three fission chamber detectors set in stainless steel shell. It is featured as coating different mass of high purified fission material on cathodes of two fission chamber detectors make their sensitivity be 1: 100, setting the third fission chamber detector to be blank detector with no fission material, setting a layer of Cd-heat neutron shielding layer with neutron moderator structure in shell, setting lead shielding layer in neutron moderator structure and placing three fission chamber detectors in lead shielding layer.
Description
Technical field
The present invention relates to the detector of fusion neutron measurement in a kind of fusion reactor.
Background technology
In the neutron measurement field, the fission chamber detector is widely used, but only is used for small throughput or isoflux neutron source.Fission reactor is present the strongest neutron source, but Main Ingredients and Appearance is thermal neutron or epithermal neutron, so leak to the outer neutron flux of reactor core far below the high energy of international thermonuclear experimental reactor (ITER) generation (2.45 or 14.5MeV) neutron flux.Therefore need research and develop dynamic range maximum up to now, range is the wideest, and measuring accuracy is the highest, can contain international thermonuclear experimental reactor (ITER) peak neutron yield (10
21/ s) fusion flux monitor.Owing to also there is not powerful high-energy neutron source as international thermonuclear experimental reactor (ITER) so in the world, therefore there is not corresponding so powerful flux monitor yet, and existing flux monitor is generally single fission chamber detector, and its measuring accuracy and measurement range all can not satisfy the needs of international thermonuclear experimental reactor (ITER) fusion neutron measurement.
Summary of the invention
The object of the present invention is to provide a kind of high precision, wide-range, high count rate, applicable to the fusion flux monitor of international thermonuclear experimental reactor (ITER) fusion neutron measurement.
Technical scheme of the present invention is as follows: the fusion flux monitor, form by placing three fission chamber detectors in the stainless steel casing, wherein, scribble high-purity fissioner of different quality on the negative electrode of two fission chamber detectors, making two detector sensitivities is 1: 100, and the 3rd fission chamber detector is " blank " detector that does not have fissioner; Be provided with one deck cadmium thermal neutron screen layer in the stainless steel casing, be provided with the neutron moderator structure in the cadmium thermal neutron screen layer, be provided with the lead shield layer in the neutron moderator structure, three fission chamber detectors place in the lead shield layer.
Aforesaid fusion flux monitor, wherein, the fissioner that is coated with on the fission chamber detector is a uranium-235, and purity is 93%, and neutron moderator is beryllium or graphite.
Aforesaid fusion flux monitor, wherein, the fissioner that is coated with on the fission chamber detector can also be uranium-238, and purity is 99.9999%, and neutron moderator is a boron carbide.
Fusion flux monitor of the present invention adopts the form of fission chamber combinations of detectors, each combination comprises three physical dimensions and identical in structure fission chamber detector, wherein two because of scribbling the not fissioner of quality, its sensitivity ratio is 100: 1, the range and the dynamic range of fusion flux monitor have been enlarged, the 3rd just is not coated with ' blank ' detector of fissioner, aims at the influence of deduction such as γ and X ray; The selection of its moderator type and the selection of polymeric barrier layer materials all make monitor have more good performance; Owing to selected highly purified fissioner for use, guaranteed the precision of measuring.
Description of drawings
Fig. 1 is the structural representation of fusion flux monitor.
Fig. 2 is the structural representation of fission chamber detector.
1. stainless steel casings, 2. lead shield layers 3,4 among the figure, 5. fission chamber detector 6. cadmium thermal neutron screen layers 7. neutron moderator structures 8. negative electrodes 9. high-purity fissioners 10. spaces 11. electrical insulators, 12. anodes, 13. shells, 14. electrical insulator 15.MI concentric cable
Embodiment
As shown in Figure 1, the fusion flux monitor is by placing three the fission chamber detectors 3,4,5 in the stainless steel casing 1 to form, wherein, scribble high-purity fissioner of different quality on the negative electrode of two fission chamber detectors 4,5, thereby their sensitivity has nothing in common with each other, according to the dynamic range of measurement requirement, technical conditions, and the reason of demarcation aspect, the present invention is by changing the quality of fissioner, and making two detector sensitivities is 1: 100.The 3rd fission chamber detector 3 be not for there being " blank " detector of fissioner, and aspects such as its physical dimension, material, working gas and electronics are all identical with other two fission chamber detectors.1 is provided with the thick cadmium thermal neutron screen layer 6 of 1mm in the stainless steel casing, be provided with neutron moderator structure 7 in the cadmium thermal neutron screen layer 6, be provided with lead shield layer 2 in the neutron moderator structure 7, be used to shield gamma-rays and hard X ray, three fission chamber detectors 3,4,5 place in the lead shield layer 2.
As shown in Figure 2, the fission chamber detector comprises anode 12 that places in the shell 13 and the negative electrode 8 that is enclosed within outside the anode 12, negative electrode 8 surfaces scribble high-purity fissioner 9, space 10 between anode 12 and the negative electrode 8 is filled with ionized gas and by electrical insulator 11,14 insulated enclosures, anode 12 connects MI concentric cable 15.The ionized gas that is filled is argon gas+5% nitrogen, and pressure is 8atm.
The high-purity fissioner 9 that is coated with on the negative electrode 8 of fission chamber detector can be a uranium-235, and purity is 93%, or uranium-238, and purity is 99.9999%.When fissioner was selected uranium-235, neutron moderator was beryllium or graphite; When fissioner was selected uranium-238, neutron moderator was a boron carbide.
Fusion flux monitor provided by the present invention is that neutron flux is measured as one of the most important fusion neutron diagnostics of purpose means in real time on total neutron source yield, fusion power and the first wall for international thermonuclear experimental reactor (ITER) provides.The present invention calculates according to MCNP, multiple different sensitivity can be proposed, its dynamic range can toppedly form the fusion flux monitor from the small throughput neutron source of demarcating, the fission chamber combinations of detectors that the D-D fusion neutron of ITER is measured to the D-T fusion neutron source of capacity operation, can measure 10
4～10
14N/ (cm
2.s) neutron flux, time resolution can reach 1ms, measuring error≤10%.
Claims (7)
1. fusion flux monitor, form by placing three the fission chamber detectors (3,4,5) in the stainless steel casing (1), it is characterized in that: the high-purity fissioner that scribbles different quality on the negative electrode of two fission chamber detectors (4,5), making two detector sensitivities is 1: 100, and the 3rd fission chamber detector (3) be not for there being " blank " detector of fissioner; Be provided with one deck cadmium thermal neutron screen layer (6) in the stainless steel casing (1), be provided with neutron moderator structure (7) in the cadmium thermal neutron screen layer (6), be provided with lead shield layer (2) in the neutron moderator structure (7), three fission chamber detectors place in the lead shield layer (2).
2. fusion flux monitor as claimed in claim 1 is characterized in that: the fissioner that is coated with on two fission chamber detectors (4,5) is a uranium-235, and purity is 93%.
3. fusion flux monitor as claimed in claim 1 is characterized in that: the fissioner that is coated with on two fission chamber detectors (4,5) is a uranium-238, and purity is 99.9999%.
4. fusion flux monitor as claimed in claim 2 is characterized in that: described neutron moderator is beryllium or graphite.
5. fusion flux monitor as claimed in claim 3 is characterized in that: described neutron moderator is a boron carbide.
6. as claim 1 or 2 or 3 or 4 or 5 described fusion flux monitors, it is characterized in that: described fission chamber detector comprises and places the anode (12) in the shell (13) and be enclosed within anode (12) negative electrode (8) outward, negative electrode (8) surface scribbles high-purity fissioner (9), space (10) between anode (12) and the negative electrode (8) is filled with ionized gas and by electrical insulator (11,14) insulated enclosure, anode (12) connects concentric cable (15).
7. fusion flux monitor as claimed in claim 6 is characterized in that: the ionized gas that is filled in the fission chamber detector is argon gas+5% nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101056452A CN100395561C (en) | 2005-09-29 | 2005-09-29 | Fusion neutron flux monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101056452A CN100395561C (en) | 2005-09-29 | 2005-09-29 | Fusion neutron flux monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1940597A true CN1940597A (en) | 2007-04-04 |
| CN100395561C CN100395561C (en) | 2008-06-18 |
Family
ID=37958950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101056452A Active CN100395561C (en) | 2005-09-29 | 2005-09-29 | Fusion neutron flux monitor |
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| CN (1) | CN100395561C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101903800B (en) * | 2007-12-24 | 2012-08-08 | 原子能和替代能源委员会 | Method of processing fission chamber measurement signals |
| CN109893780A (en) * | 2019-04-19 | 2019-06-18 | 兰州大学 | A kind of BNCT epithermal neutron flux detector |
| CN114864113A (en) * | 2022-05-31 | 2022-08-05 | 核工业西南物理研究院 | First wall structure of tokamak |
| CN116338761A (en) * | 2023-03-29 | 2023-06-27 | 西安中核核仪器股份有限公司 | Wide-range neutron dose rate instrument |
-
2005
- 2005-09-29 CN CNB2005101056452A patent/CN100395561C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101903800B (en) * | 2007-12-24 | 2012-08-08 | 原子能和替代能源委员会 | Method of processing fission chamber measurement signals |
| CN109893780A (en) * | 2019-04-19 | 2019-06-18 | 兰州大学 | A kind of BNCT epithermal neutron flux detector |
| CN114864113A (en) * | 2022-05-31 | 2022-08-05 | 核工业西南物理研究院 | First wall structure of tokamak |
| CN116338761A (en) * | 2023-03-29 | 2023-06-27 | 西安中核核仪器股份有限公司 | Wide-range neutron dose rate instrument |
| CN116338761B (en) * | 2023-03-29 | 2024-06-07 | 西安中核核仪器股份有限公司 | Wide-range neutron dose rate instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100395561C (en) | 2008-06-18 |
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