CN1837855A - Uneven measurement method for single-ball multi-counter probe - Google Patents
Uneven measurement method for single-ball multi-counter probe Download PDFInfo
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- CN1837855A CN1837855A CN 200510056787 CN200510056787A CN1837855A CN 1837855 A CN1837855 A CN 1837855A CN 200510056787 CN200510056787 CN 200510056787 CN 200510056787 A CN200510056787 A CN 200510056787A CN 1837855 A CN1837855 A CN 1837855A
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Abstract
This invention relates to an uneven measurement method for single-ball multi-counter probe. Wherein, arranging three slim column thermal neutron position sensitive counters into a slow-down ball equispacedly and vertical mutually; measuring the distribution of thermal neutron; dividing axially the ball into out-thin-inner-thick some spherical shells unequally in data process, setting the thickness of outermost layer more than 5mm and other layers with thickness by equidifferent values; summating the number of every counter; calculating the opposite response function by a spectrum deconvolution software. The result is very close to the neutron source energy spectrum.
Description
Technical field
The present invention relates to the neutron dose monitoring field, be specifically related to the uneven measurement method for single-ball multi-counter probe of a kind of neutron dose instrument and power spectrum instrument.
Background technology
Diversified neutron dose instrument and power spectrum instrument have been developed in decades, with regard to neutron dosimeter, no matter be to adopt any detector, what kind of design probe is taked, or the data disposal route carried out various improvement, if adopt single counter list slow body, there is not a kind of instrument energy satisfactory, show that mainly the dosage energy response is undesirable.Reason is that the energy range of neutron irradiation field is often than broad, the fluence dose conversion factor of neutron changes the difference that two magnitudes are almost arranged with neutron energy, the counter great majority that adopt are thermal neutron sensitivities, low to fast neutron sensitivity, be difficult to energy response preferably so cause dosemeter, the probe that therefore designs neutron dose (rate) instrument preferably adopts a plurality of counters.
For the energy spectrometer of place, deviser's starting point is the information of monitoring neutron spectrum aspect, and does not consider the monitoring information of radiation protection amount aspect.Experiment type place energy spectrometer only is confined to use in the laboratory, and it is very inconvenient to be applied to the scene; Portable place energy spectrometer also has weak point, and the ROSPEC neutron spectromenter is measured neutron because of adopting the proton recoil method, and the neutron energy of measurement is difficult to further widen at 50keV～4.5MeV; Commercial REM500 neutron survey monitor is a kind of more satisfactory Portable place dosemeter, but fails to provide relevant monitoring informations such as average energy and neutron fluence power spectrum.
In sum, when development and exploitation neutron dose monitoring instrument, the quick advantage easy to use of measurement of traditional neutron dosimeter to be considered on the one hand, undesirable this shortcoming of dosage energy response will be overcome simultaneously; To absorb the characteristics that the place energy spectrometer can obtain neutron spectrum aspect information on the other hand, to overcome the inconvenience in the use of place energy spectrometer simultaneously, the two is organically combined, learn from other's strong points to offset one's weaknesses, study a kind of feasible probe designs, promptly improve the unfavorable situation of present neutron dosimeter energy response, can calculate the power spectrum of measured radiation field simultaneously.
Japan Nagoya university has developed the position sensitive of elongated cylindrical
3He proportional counter (position-sensitive
3And this counter is applied in the research of place energy spectrometer He proportional counter).When neutron irradiation probe, the slowing down degree of neutron changes with change in depth in the spheroid, have the characteristics of position sensitive based on neutron position-sensitive counter, thermal neutron distributes in the spheroid by measuring in the method perpendicular to each other slowing down spheroid that to be installed in a radius be 12.5cm the counter of three thermal neutron position sensitives.Japan Nagoya university divides spheroid and adopts sphere diameter to halving method during data processing, promptly ball is divided into 5 spherical shells, each shell thickness is identical, 6 little segment counters (innermost layer is 3 little segment counters) are arranged in each spherical shell, the counting of each the little segment counter in each spherical shell is sued for peace as a count block, can get the counting in 5 districts like this, the energy fluence response function of resulting 5 count blocks is calculated.Be respectively 0～2.5cm (1 district), 2.5～5cm (2 district), 5～7.5cm (3 district), 7.5～10cm (4 district) and 10～12.5cm (5 district) in each district of radius of a ball direction, the radius of corresponding spheroid is respectively 2.5cm, 5cm, 7.5cm, 10cm and 12.5cm.Corresponding two the counting sections in each counting region, the counting section in 1 district to 5 district be respectively 0～2.5cm and 0～-2.5cm, 2.5～5cm and-2.5～-5cm, 5～7.5cm and-5～-7.5cm, 7.5～10cm and-7.5～-10cm and 10～12.5cm and-10～-12.5cm.It is not ideal enough that the resolving spectra of the measurement result usefulness spectrum unscrambling computed in software gained of this halving method and neutron source power spectrum are coincide.
Summary of the invention
The objective of the invention is to provide a kind of and can make relatively good that resolving spectra and neutron source power spectrum coincide, can make the uneven measurement method of the single-ball multi-counter probe that the energy response of neutron dosimeter table increases simultaneously.
Technical scheme of the present invention is as follows: a kind of uneven measurement method for single-ball multi-counter probe, this method is by mutual equally spaced being installed in the slowing down spheroid of direction perpendicular to each other three elongated cylindrical thermal neutron position sensitive counters, measure the distribution of thermal neutron in the spheroid, adopt when data processing not that bisecting method is divided into spheroid at radial direction several spherical shell zones of " outside thin in thick ", wherein, the thickness of outermost layer spherical shell is greater than 5mm, the thickness of each layer adopts the method for equal difference to determine, the counting of each the little segment counter in each spherical shell is sued for peace, application spectrum unscrambling software calculates the energy fluence response function of each count block, obtains resolving spectra.
Show by actual measurement, adopt the resolving spectra of this uneven measurement method gained to compare with bisecting method, what the resolving spectra of halving method and neutron source power spectrum were not coincide is relatively good, and the energy response that makes the neutron dose instrument by original ± 100% bring up to ± 30%, can improve the neutron dosimeter energy response problem of present use.
Description of drawings
Fig. 1 is the structural representation of probe.
Fig. 2 is the neutron fluence energy response curve of halving method.
Fig. 3 is the neutron fluence energy response curve of not halving method.
1. counters, 2. slowing down spheroids among the figure
Embodiment
Below in conjunction with embodiment the present invention is described in detail.
Uneven measurement method for single-ball multi-counter probe involved in the present invention is three elongated cylindrical thermal neutron position sensitives
3He proportional counter 1 is by mutual equally spaced being installed in the slowing down spheroid 2 of direction perpendicular to each other, and slowing down spheroid 2 diameters are typically chosen between 15～30cm is advisable.Because when sphere diameter during less than 15cm, the fluence energy response is not ideal enough; When sphere diameter during, be not easy to carry greater than 30cm.It is that spherical 2, three counters 1 of slow body of tygon axle center spacing distance each other of 25cm is 1.4cm that present embodiment is selected diameter for use, measures the distribution of thermal neutron in the spheroid.Adopt when data processing not that bisecting method is divided into spheroid at radial direction several zones of " outside thin in thick ", the thickness of each layer adopts the method for equal difference to determine, because the resolution of position sensitive counter is about 5mm, the influence of the end effect of position sensitive counter in addition, therefore, the thickness of outermost layer spherical shell should be greater than 5mm.The thickness of outermost layer spherical shell is selected 1.5cm for use in the present embodiment, thickness difference between each layer spherical shell is 0.5cm, 5 spherical shell zones that the slowing down spheroid are divided into " outer thin interior thick ", it is respectively 1 district of 0～3.5cm, 3.5 2 districts of～6.5cm, 6.5 3 districts of～9cm, 4 districts of 9～11cm and 5 districts of 11～12.5cm, make true origin at the centre of sphere, the counting section in 1 district to 5 district be respectively 0～3.5cm and 0～-3.5cm, 3.5～6.5cm and-3.5～-6.5cm, 6.5～9cm and-6.5～-9cm, 9～11cm and-9～-11cm and 11～12.5cm and-11～-12.5cm, the counting of each the little segment counter in each spherical shell is sued for peace, application spectrum unscrambling software calculates the energy fluence response function of 5 count blocks, obtains resolving spectra.
Present embodiment has been selected in actual measurement
252Cf and two kinds of neutron reference radiations of Am-Be field, measure the net counting rate of 5 counting regions, utilize MXD-FC31 and two kinds of spectrum unscrambling software analysis of GRV-FC31 radiation protection amount in the UMG software package, calculate fluence rate, on every side dose equivalent rate, unit fluence average around dose equivalent and dose equivalent average energy, the deviation of its result and reference value does not surpass ± 15%, analyze from resolving spectra, show that the resolving spectra of halving method not is better than the resolving spectra of halving method.
Halving method and not the fluence energy response of halving method shown in Fig. 2 and 3.Fig. 3 should have evident difference with Fig. 2, and mainly show: the fluence energy response of (1) 5 district is by the bimodal monotone decreasing that becomes, and this exposed detector fluence energy response to many ball measurement methods is similar; The fluence energy response of (2) 4 districts is become by original simple spike that bimodal (extreme point is respectively 1.8 * 10
-5MeV and 0.56MeV), this 4.5cm diameter ball fluence energy response to many ball measurement methods is similar, and (extreme point is about 2.5 * 10 respectively
-6MeV and 5.0 * 10
-2MeV); And fluence energy response variation in 1-3 district is not obvious, the fluence energy response in 1 district, 2 districts and 3 districts is simple spike (peak value is respectively 2.2MeV, 2.2MeV and 1.8MeV), and this and many ball measurement methods sphere diameter are respectively the fluence energy response quite similar (peak value is about 3.9MeV, 1.6MeV and 0.6MeV respectively) of 10cm, 8cm and 6cm detector.Many ball measurement methods use many balls neutron spectromenter to carry out neutron spectrum and measure, and generally between 5～18, the diameter of each ball also is difference methods such as employing to the number of slowing down spheroid, and a thermal neutron detecting element is put by ball center, for example
6LiI, boron plastics and lithium plastics or lithium glass scintillator, BF
3Proportional counter,
3He proportional counter etc., this kind measuring technique comparative maturity, and be widely used in the neutron spectrum measurement of radiation protection aspect.The similarity of the neutron fluence energy response curve of uneven measurement method and the fluence energy response curve of many ball measurement methods has just in time illustrated the superiority place of uneven measurement method.
Claims (2)
1. uneven measurement method for single-ball multi-counter probe, this method is by mutual equally spaced being installed in the slowing down spheroid (2) of direction perpendicular to each other three elongated cylindrical thermal neutron position sensitive counters (1), measure the distribution of thermal neutron in the spheroid, it is characterized in that: adopt when data processing not that bisecting method is divided into spheroid at radial direction several spherical shell zones of " outside thin in thick ", wherein, the thickness of outermost layer spherical shell is greater than 5mm, the thickness of each layer adopts the method for equal difference to determine, the counting of each the little segment counter in each spherical shell is sued for peace, application spectrum unscrambling software calculates the energy fluence response function of each count block, obtains resolving spectra.
2. a kind of uneven measurement method for single-ball multi-counter probe as claimed in claim 1, it is characterized in that: said spheroid is divided into 5 spherical shell zones of " outer thin interior thick " altogether, the thickness of outermost layer spherical shell is 1.5cm, and the thickness difference between each layer spherical shell is 0.5cm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419290B (en) * | 2008-12-04 | 2012-03-14 | 哈尔滨工程大学 | Dyadic slowing type high energy neutrons dosimeter |
| CN101738626B (en) * | 2008-11-14 | 2012-11-28 | 中国辐射防护研究院 | Method for confirming thickness and clearance rate of gamma dosemeter compensating filter |
| CN102928867A (en) * | 2012-10-23 | 2013-02-13 | 哈尔滨工程大学 | Compensation type neutron dose instrument |
| CN110824543A (en) * | 2019-11-20 | 2020-02-21 | 中国科学院高能物理研究所 | Portable single-ball neutron spectrometer |
| CN111487672A (en) * | 2020-04-26 | 2020-08-04 | 中国辐射防护研究院 | Method for measuring neutron energy spectrum by semiconductor detector |
| CN114035222A (en) * | 2021-10-28 | 2022-02-11 | 中国船舶重工集团公司第七一九研究所 | Online neutron energy spectrum measuring device |
-
2005
- 2005-03-25 CN CN 200510056787 patent/CN1837855A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738626B (en) * | 2008-11-14 | 2012-11-28 | 中国辐射防护研究院 | Method for confirming thickness and clearance rate of gamma dosemeter compensating filter |
| CN101419290B (en) * | 2008-12-04 | 2012-03-14 | 哈尔滨工程大学 | Dyadic slowing type high energy neutrons dosimeter |
| CN102928867A (en) * | 2012-10-23 | 2013-02-13 | 哈尔滨工程大学 | Compensation type neutron dose instrument |
| CN110824543A (en) * | 2019-11-20 | 2020-02-21 | 中国科学院高能物理研究所 | Portable single-ball neutron spectrometer |
| CN111487672A (en) * | 2020-04-26 | 2020-08-04 | 中国辐射防护研究院 | Method for measuring neutron energy spectrum by semiconductor detector |
| CN114035222A (en) * | 2021-10-28 | 2022-02-11 | 中国船舶重工集团公司第七一九研究所 | Online neutron energy spectrum measuring device |
| CN114035222B (en) * | 2021-10-28 | 2023-07-21 | 中国船舶重工集团公司第七一九研究所 | Online neutron spectrum measuring device |
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