CN206906592U - One kind measure235The device of U mass - Google Patents
One kind measure235The device of U mass Download PDFInfo
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- CN206906592U CN206906592U CN201720580119.XU CN201720580119U CN206906592U CN 206906592 U CN206906592 U CN 206906592U CN 201720580119 U CN201720580119 U CN 201720580119U CN 206906592 U CN206906592 U CN 206906592U
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- mass
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- scintillator detector
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Abstract
The utility model discloses one kind to determine235The device of U mass, device are mainly made up of scintillator detector and neutron source, and scintillator detector detection head end, which contacts with each other, forms regular polygon structure, and neutron source is placed in regular polygon inside configuration.Based on the utility model provides a kind of bulk detector using liquid scintillation, cost is low, measurement accuracy is high235U quality measuring apparatus.
Description
Technical field
The utility model belongs to nuclear safeguards verification technology field, more particularly to a kind of measure235The device of U mass.
Background technology
The measurement of nuclear material quality is one of focus that nuclear safeguards verification technology is paid special attention to, wherein235The measurement of U mass
The difficult point of always NDA (Non-Destructive Assay, nondestructive analysis) measurements.235The NDA measurements of U mass are typically adopted
With based on3The thermal neutron measurement apparatus of He proportional counter tubes and its corresponding measurement and analysis method, presently relevant technology have compared
It is more ripe and be widely used in various nuclear facilities.But this conventional art is upper in the presence of two shortcomings in application:Split first, working as
After becoming the association in time information between neutron from ns magnitudes slowing down into us magnitudes, when carrying out coincidence measurement or multiplicity measures,
Interference of the random signals to measurement result is larger, and analysis precision is limited, it is difficult to further improves.Second,3He is nuclear weapon production
Byproduct, in recent years various countries substantially stop new production nuclear weapon,3He is based on past stock supply, and its price is year by year
Go up, cause equipment cost higher (a set of to include 1003The equipment cost about 1000 of the typical measurement apparatus of He pipes ten thousand), from
And limit its large-scale application.Therefore, either new spy is studied for technology development or the purpose of control device cost
Survey the study hotspot that device and corresponding e measurement technology are always international forward position, and Research Challenges.
The content of the invention
(1) goal of the invention
The utility model overcomes the deficiencies in the prior art, there is provided based on a kind of bulk detector using liquid scintillation,
Cost is low, measurement accuracy is high235U quality measuring apparatus.
(2) technical scheme
In order to solve the problems of prior art, the technical scheme that the utility model is provided is as follows:
One kind measure235The device of U mass, it is characterised in that the device is mainly by scintillator detector and neutron source group
Into cylindrical scintillator detector wraps up cube form with polyethylene blocks, and is formed just with detecting head end close contact
Polygonized structure, neutron source are placed in regular polygon inside configuration.
Further, the scintillator detector is externally provided with slow body.
Further, the gap area that the scintillator detector attachment structure is formed is provided with shield.
Further, the scintillator detector is liquid scintillation bulk detector.
Further, the quantity of the scintillator detector is no less than 6.
Further, the slow body is polyethylene.
Further, the shield is polyethylene.
Further, the neutron source has 2, respectively above and below sample.
Further, the polygonized structure upper end is furnished with lid.
(3) beneficial effect
The utility model has opened up another measure235The mode of U mass, the utility model is by using liquid scintillator
Detector not only reduces measurement cost, and also effectively raising the coupling uniformity of measurement apparatus, (coupling uniformity refers to put
Put the uniformity for the neutron field distribution that the sample interior diverse location in sample space is subject to) and efficiency uniformity (efficiency is equal
Even property refers to be placed on the detecting efficiency spatial distribution of the fission neutron of the sample interior diverse location outgoing in sample space
Uniformity), so as to be effectively improved measurement235The precision of U mass.
The regular polygon structure of detection device ensure that detection efficient uniformity, make the number of each scintillator detector detection
It is different smaller according to value difference.Detecting head contacts with each other so that the neutron that detector detection sample as much as possible gives out.Outside detector
Slow body and shield cause neutron enter detector after if any releasing, can also be reduced because of slow body and shield, from
And interfering with each other for neutron signal between detector is reduced, it ensure that the accuracy rate of detection.2 neutron sources are respectively above and below sample
Both ends can ensure sample by homogeneous radiation.
Brief description of the drawings
Fig. 1 device top views
Fig. 2 device front views
1st, scintillator detector 2, slow body 3, shield 4, lid
Embodiment
The utility model is further elaborated below in conjunction with specification drawings and specific embodiments.
One kind measure235The device of U mass, mainly it is made up of liquid scintillation bulk detector and neutron source, scintillator detector
Quantity be no less than 6, liquid scintillation bulk detector detecting head end is closely spliced to form regular polygon structure, and liquid scintillator is visited
Survey device and be externally provided with polyethylene slow body, the gap area that liquid scintillation bulk detector attachment structure is formed is provided with polyethylene slow body
And shield, 2 neutron sources are placed in inside polygonized structure, and respectively above and below sample, polygonized structure upper end is matched somebody with somebody
There is lid, affiliated lid is made up of slow body.
Embodiment:
Before device design, it is necessary first to the suitable effectively sample chamber size of setting." effective sample room " refers in the space
Interior optional position is satisfied by preferable coupling uniformity and efficiency uniformity.Because testing sample size is usual in practical application
It is smaller, effective sample room is dimensioned so as to 6*6*8cm3Cubic space.The utility model is visited by six liquid scintillators
The regular hexagon structure of device detection head end composition is surveyed, effective sample room is arranged on hexagon center position.The liquid of selection
Scintillator detector diameter 12.7cm, thick 7.6cm.The liquid scintillator of cylinder all wraps up cube form with polyethylene,
And the delta-shaped region between detector places polyethylene slowing down and shield, to reduce crosstalk phenomenon.Neutron source uses
Two AmLi neutron sources, it is symmetrically placed in sample upper end, lower end.After sample is put into sample room, close the lid, start to measure.
, it is necessary to which determination sample abundance is to determine during analyze data235U and238U mass ratio, and introduce equivalent coefficient ceffWith
And equivalent mass meff:
Wherein m235Represent235U mass, m238Represent238U mass.
In view of the m in above formula238Can be by m235Determined with abundance (being denoted as enr), the formula can also be write:
For the present apparatus, by simulation and analysis of experimental data, its c is determinedeffIt is worth for 0.044, implies that average one238U
Atom pair measurement meet/multiplicity count contribution equivalent to one 0.044235The contribution of U atoms.
So the present apparatus meet in fast neutron/multiplicity measurement apparatus beside installed a HPGe detector additional, pass through γ
Spectroscopy determines uranium abundance.
With235U abundance is 10%, diameter 8mm, high 10mm UO2(wherein uranium-bearing gross mass 4.78g, contains pellet sample235U
Quality 0.478g) exemplified by sketch specific implementation process.
For convenience of measurement, by every 8 of pellet with paper roll into length 80mm, diameter about 10mm (the pellet diameter addend layer scraps of paper
Thickness) cigarette-like " pellet rod ".Then 8 pellet rods are chosen to measure.8 pellet rods are put into made of aluminium alloy
In support frame, placing range is all in effective sample space.
Then multiplicity measurement is carried out to sample, the neutron multiplicity data measured is gone out by corresponding analysis arithmetic analysis
Corresponding induction fission rate F values, then pass through good F values of scale and equivalent235Relation curve (formula 3) between U mass is true
It is fixed equivalent235U mass is 43.7g.
F is the induction fission rate that is solved according to multiplicity counting rate in above formula, meffTo be equivalent235U mass, a and b are
System parameter, wherein a is 10.1, b 45.0.
Sample is measured by gamma energy spectrum method again235U abundance, it is as a result 9.9%.It is corresponding235U and238U mass ratios are
0.11.According to meff=43.7, enr=0.099, and ceff=0.044, and formula (2), you can provide235U mass is
31.4g, compared with nominal value 30.6g, relative deviation 2.6%.
Test result indicates that 6*6*8cm of the present apparatus to setting3Sample space, ensure that be better than 5% coupling uniformity
(as shown in table 1) and it is better than 1.5% efficiency uniformity (detection efficient of center is 6.59%, and the spy of marginal position
It is 6.67% to survey efficiency, 1.2%) both differ.
1 two kinds of differences of table235The repeated measuring results of U abundance samples
Claims (8)
1. one kind measure235The device of U mass, it is characterised in that the device is mainly made up of scintillator detector and neutron source,
Scintillator detector detection head end, which contacts with each other, forms regular polygon structure, and neutron source is placed in regular polygon inside configuration.
A kind of 2. measure according to claim 1235The device of U mass, it is characterised in that outside the scintillator detector
Provided with slow body.
A kind of 3. measure according to claim 1235The device of U mass, it is characterised in that the scintillator detector connects
The gap area that binding structure is formed is provided with shield.
A kind of 4. measure according to claim 1235The device of U mass, it is characterised in that the scintillator detector is
Liquid scintillation bulk detector.
A kind of 5. measure according to claim 2235The device of U mass, it is characterised in that the slow body is polyethylene.
A kind of 6. measure according to claim 3235The device of U mass, it is characterised in that the shield is polyethylene.
A kind of 7. measure according to claim 1235The device of U mass, it is characterised in that the neutron source has 2, point
Wei Yu not be above and below sample.
A kind of 8. measure according to claim 1235The device of U mass, it is characterised in that the polygonized structure upper end
Equipped with lid.
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CN201720580119.XU CN206906592U (en) | 2017-05-24 | 2017-05-24 | One kind measure235The device of U mass |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108919334A (en) * | 2018-08-22 | 2018-11-30 | 中国原子能科学研究院 | A kind of UF6The verification measurement method of uranium quality and abundance in big tank |
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2017
- 2017-05-24 CN CN201720580119.XU patent/CN206906592U/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108919334A (en) * | 2018-08-22 | 2018-11-30 | 中国原子能科学研究院 | A kind of UF6The verification measurement method of uranium quality and abundance in big tank |
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