CN104198515A - Nondestructive container detection method based on Compton gamma light-nuclear resonance fluorescence - Google Patents
Nondestructive container detection method based on Compton gamma light-nuclear resonance fluorescence Download PDFInfo
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- CN104198515A CN104198515A CN201410439837.6A CN201410439837A CN104198515A CN 104198515 A CN104198515 A CN 104198515A CN 201410439837 A CN201410439837 A CN 201410439837A CN 104198515 A CN104198515 A CN 104198515A
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Abstract
The invention discloses a nondestructive container detection method based on the Compton gamma light-nuclear resonance fluorescence. The method comprises the following steps: (1) putting a Compton gamma light source on one side of a container to supply gamma light beams, and putting energy spectrometers on the two sides of the container, wherein included angles of 90 degrees and -90 degrees are formed between the energy spectrometers in the horizontal plane and the direction of an incident gamma beam respectively for performing energy spectrum measurement; (2) identifying nuclear resonance fluorescence characteristic peaks of various nuclides according to the distribution of measured energy spectra so as to further obtain possible nuclide type information in the container; (3) putting a flow intensity detector on the other side, opposite to the side in which the light source is arranged, of the container, and measuring the number of rays passing through different container positions by horizontally and vertically scanning the container to obtain position information and ray intensity information; and (4) putting nuclide evidential foils with different thicknesses between the container and the flow intensity detector, repeatedly executing the step (3), and comparing the ray intensity value with the ray intensity value measured in the step (3). According to the method, the various nuclides can be identified quickly and accurately, the signal to noise ratio is improved, the photographic reproduction dosage is reduced, and the scanning time is shortened.
Description
Technical field
The invention belongs to field of non destructive testing, relate in particular to a kind of container lossless detection method based on Compton γ light-nuclear fluore scence.
Background technology
Compton light source refers to a kind of X/ gamma ray projector that utilizes high power laser light and relativistic electron beam to carry out inverse Compton scattering and to produce.The performance characteristics such as it has that flux () is high, pulse is short, (standard) monoenergetic, good directionality, polarization are high and energy is adjustable, it is one of strong probe disclosing on atom/molecule yardstick the structure of matter and biological phenomena, at physics, chemistry, biological, medical science and isotope imaging, and numerous Disciplinary Frontiers such as energy demand also have high using value.
Existing nondestructive detection system can not be analyzed all kinds of nucleic fast He accurately, and signal to noise ratio (S/N ratio) is to be improved, and note in reply dosage is large, and sweep time is long.
Container nondestructive detection system based on Compton γ light-nuclear fluore scence method, compared with existing detection system, has obvious advantage.
Summary of the invention
The object of the present invention is to provide a kind of container lossless detection method based on Compton γ light-nuclear fluore scence (NRF), being intended to solve existing nondestructive detection system can not analyze all kinds of nucleic fast He accurately, signal to noise ratio (S/N ratio) is to be improved, note in reply dosage is large, the problem that sweep time is long.
The present invention is achieved in that a kind of container lossless detection method based on Compton γ light-nuclear fluore scence comprises the following steps:
Step 1, be sidelong and put Compton γ light source γ light beam is provided at container one, an each energy spectrometer, become respectively with incident γ beam direction in surface level ± 90 ° of angular measurement power spectrums of this energy spectrometer of placing in container both sides;
Step 2, according to measuring spectral distribution, the nuclear fluore scence characteristic peak of the various nucleic of identification and then obtain possible nucleic kind of information in container;
Step 3, place the strong detector of stream at the opposite side relative with light source of container, by horizontal and vertical scan containers, measure the ray counting by different container positions, obtain the information of position and transmitted intensity;
Step 4, place the nucleic witness paper tinsel of different-thickness between strong detector at container and stream, repeating step three transmitted intensity of measuring with step 3 are compared, as the nuclear fluore scence peak position at witness paper tinsel has obvious radiation attenuation, as it is not obvious to decay, can further regulate the thickness of nucleic witness paper tinsel to observe radiation attenuation, confirm nucleic kind and obtain nucleic positional information, otherwise, otherwise result.
Described energy spectrometer, as the number of germanium detector is greater than one.
The strong detector of described stream, as the number of lanthanum bromide counter is greater than one.
Beneficial effect of the present invention is as follows:
(1) by scanning incident energy of γ ray, there is not dividing of so-called " easily measuring nucleic " and " the difficult nucleic of measuring " in nuclear material (comprising its isotope) Non-Destructive Testing based on nuclear fluore scence (NRF), all can analyze fast and accurately all kinds of nucleic of atomic number Z>2;
(2), in the gamma-ray detection system with better energy resolution, by regulating the Compton beam,gamma-ray energy of accurate monoenergetic to separating the fluorescence gamma-rays producing near fluorescent energy point and from background noise, be conducive to improve its signal to noise ratio (S/N ratio);
(3) the high brightness gamma ray projector that laser Compton scattering produces will contribute to improve the performance index of nondestructive detection system, under the brightness of identical unit accumulation, compared with method based on bremsstrahlung source, the irradiation dose that it is required and sweep time be little (or short) 1000 times conventionally.
Brief description of the drawings
Fig. 1 is the container lossless detection method process flow diagram based on Compton γ light-nuclear fluore scence that the embodiment of the present invention provides;
Fig. 2 and Fig. 3 are that the container that the embodiment of the present invention provides detects schematic layout pattern;
Fig. 4 is the low atomic number nucleic C that provides of the embodiment of the present invention, the nuclear fluore scence peak of N, O;
Fig. 5 is the nuclear fluore scence peak of the Cr nucleic that provides of the embodiment of the present invention;
Fig. 6 is the testing result of the different scanning position that provides of the embodiment of the present invention;
Fig. 7 is that Compton γ light-nuclear fluore scence method of utilizing that the embodiment of the present invention provides is surveyed the schematic diagram of metallic lead material hidden in goods and parcel;
Fig. 8 is the variation diagram of the plumbous nuclear fluore scence yield detecting that provides of the embodiment of the present invention with target position;
Fig. 9 be the embodiment of the present invention provide in the situation that container is loaded with certain nucleic, Compton γ light injects (solid line) before container, see through (imaginary point) after container and see through nucleic witness paper tinsel after the relative current of (dotted line) change by force, in figure, horizontal ordinate is nuclear fluore scence peak position poor of incident gamma energy and nucleic.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, a kind of container lossless detection method based on Compton γ light-nuclear fluore scence comprises the following steps:
S101: be sidelong and put γ light source γ light beam is provided at container one, each HpGe energy energy spectrometer of placing in container both sides, as HpGe energy spectrometer, its become respectively with incident γ beam direction in surface level ± 90 ° of angular measurement power spectrums;
S102: according to measuring spectral distribution, possible nucleic kind of information in the nuclear fluore scence characteristic peak of the various nucleic of identification and then acquisition container;
Step 3, place the strong detector of stream at the opposite side relative with light source of container, as lanthanum bromide counter, by horizontal and vertical scan containers, measure the ray counting by different container positions, obtain the information of position and transmitted intensity;
S104: as shown in Figure 3, between container and the strong detector of stream, place the nucleic witness paper tinsel of different-thickness, repeating step three transmitted intensity of measuring with step 3 are compared, as the nuclear fluore scence peak position at witness paper tinsel has obvious radiation attenuation, as it is not obvious to decay, can further regulate the thickness of nucleic witness paper tinsel to observe radiation attenuation, confirm nucleic kind and obtain nucleic positional information, otherwise, otherwise result.
Further, the number of described energy spectrometer is greater than one.
Further, the number of the described strong detector of stream is greater than one.
Further, the location point of too low counting is counting of abnormal point.
Principle of work of the present invention is:
Utilize Compton light source syncaryon resonance fluorescence (NRF) to carry out direct Non-Destructive Testing and management to nuclear material.Nuclear fluore scence provides a kind of fingerprint of uniqueness to the interested nuclear material of people.This fingerprint is determined by the proton in core and neutron number.In the time utilizing bremsstrahlung source or Compton light source that the g beam irradiation sample of certain energy (energy difference between two energy levels of core, transition energy) is provided.The g radial energy of incident is effectively absorbed by nucleon.The nucleon of being excited is subsequently emitted its energy g ray consistent with projectile energy in the process of de excitation.By the g ray in measurement de excitation process (Electromagnetic Transitions) or the absorption spectra of sample, just can obtain composition and the content of sample Radionuclide.Compton γ light source is compared with other light source, have that well-illuminated height, pulse are short, monochromaticity and collimation good, and energy is in the continuous performance characteristics such as adjustable, the Compton γ light that covers sub-MeV to tens MeVNeng district has extremely strong penetration power, is suitable for very much heavily shielding nuclear material Non-Destructive Testing and identification under environment.
As Figure 4-8, Fig. 4 is the nuclear fluore scence peak of low atomic number nucleic C, N, O to nucleic Non-Destructive Testing (experiment measuring) result based on Compton γ light-nuclear fluore scence; Fig. 5 is the nuclear fluore scence peak of Cr nucleic; Fig. 6 is the testing result of different scanning position, in the upper figure of Fig. 6, can know and see plumbous resonance fluorescence peak at y=-8cm place, position, illustrates that there is lead the inside; In figure below of Fig. 6, do not find certain plumbous resonance fluorescence peak at y=-12cm place, position, the unleaded nucleic in this position is tentatively described.
Fig. 7 utilizes Compton γ light-nuclear fluore scence method to survey the schematic diagram of nuclear material (as plumbous material) hidden in goods and parcel.
Fig. 8 is the plumbous nuclear fluore scence yield that the detects variation diagram with target position, and result of detection shows, in-10-10mm position, in goods and parcel, in hidden nucleic, has plumbous nucleic, and other position finds no the sign of plumbous nucleic.
Fig. 9 is in the situation that container is loaded with certain nucleic, Compton γ light injects (solid line) before container, see through (imaginary point) after container and see through nucleic witness paper tinsel after the relative current of (dotted line) change by force, in figure, horizontal ordinate is nuclear fluore scence peak position poor of incident gamma energy and nucleic.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that performing creative labour can make or distortion still within protection scope of the present invention.
Claims (3)
1. the container lossless detection method based on Compton γ light-nuclear fluore scence, is characterized in that, the described container lossless detection method based on Compton γ light-nuclear fluore scence comprises the following steps:
Step 1, be sidelong and put Compton γ light source γ light beam is provided at container one, respectively place energy spectrometer in container both sides, become respectively with incident γ beam direction ± 90 ° of angular measurement power spectrums of this energy spectrometer in surface level;
Step 2, according to measuring spectral distribution, the nuclear fluore scence characteristic peak of the various nucleic of identification and then obtain the nucleic kind of information in container;
Step 3, place the strong detector of stream at the opposite side relative with light source of container, by horizontal and vertical scan containers, measure the ray counting by different container positions, obtain the information of position and transmitted intensity;
Step 4, place the nucleic witness paper tinsel of different-thickness between strong detector at container and stream, repeating step three transmitted intensity of measuring with step 3 are compared, as the nuclear fluore scence peak position at witness paper tinsel has obvious radiation attenuation, as it is not obvious to decay, further regulate the thickness of nucleic witness paper tinsel to observe radiation attenuation, confirm nucleic kind and obtain nucleic positional information, otherwise, otherwise result.
2. the container lossless detection method based on Compton γ light-nuclear fluore scence as claimed in claim 1, is characterized in that, the number of described energy spectrometer is greater than 1.
3. the container lossless detection method based on Compton γ light-nuclear fluore scence as claimed in claim 1, is characterized in that, the number of the described strong detector of stream is greater than 1.
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| CN201410439837.6A CN104198515A (en) | 2014-09-01 | 2014-09-01 | Nondestructive container detection method based on Compton gamma light-nuclear resonance fluorescence |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267775A (en) * | 2018-01-18 | 2018-07-10 | 西北核技术研究所 | A kind of pulse gamma-rays spectral measurement system and method based on nuclear fluore scence |
| CN112485819A (en) * | 2020-11-05 | 2021-03-12 | 深圳中广核工程设计有限公司 | Nuclear facility solid waste package radioactivity evaluation method and system |
-
2014
- 2014-09-01 CN CN201410439837.6A patent/CN104198515A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267775A (en) * | 2018-01-18 | 2018-07-10 | 西北核技术研究所 | A kind of pulse gamma-rays spectral measurement system and method based on nuclear fluore scence |
| CN108267775B (en) * | 2018-01-18 | 2019-08-13 | 西北核技术研究所 | A kind of pulse gamma-rays spectral measurement system and method based on nuclear fluore scence |
| CN112485819A (en) * | 2020-11-05 | 2021-03-12 | 深圳中广核工程设计有限公司 | Nuclear facility solid waste package radioactivity evaluation method and system |
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