CN102608644A - Radioactive substance monitoring system - Google Patents
Radioactive substance monitoring system Download PDFInfo
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- CN102608644A CN102608644A CN2011104535149A CN201110453514A CN102608644A CN 102608644 A CN102608644 A CN 102608644A CN 2011104535149 A CN2011104535149 A CN 2011104535149A CN 201110453514 A CN201110453514 A CN 201110453514A CN 102608644 A CN102608644 A CN 102608644A
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Abstract
The invention relates to a radioactive substance monitoring system, which comprises a detector, wherein the detector is used for counting radioactive substances and generating warning according to the counting. The radioactive substance monitoring system is characterized in that a collimating grid is arranged on the detecting surface of the detector so ad to reduce the counting generated by natural radioactive substances.
Description
The application is to be that November 18, application number in 2008 are 200810227003.3 and denomination of invention dividing an application for the application for a patent for invention of " radioactive substance monitoring system " applying date.
Technical field
The present invention relates to a kind of radioactive substance monitoring system, it comprises detector, is used for radiomaterial is counted and produce to be reported to the police according to counting.
Background technology
Plastic scintillator detector is the roentgen dose X of surveying radiomaterial, power spectrum, radiomaterial such as is counted at one of the most frequently used radioactive matter monitoring equipment.In fields such as special nuclear material detection, radiomaterial detection, low dosage environment measuring, ray energy spectrum measurement, because detection efficiency is high, power spectrum responds characteristics such as wide, plastic scintillator detector has become the first-selected detector in these fields.
Mostly existing radioactive substance monitoring system based on plastic scintillant is the single-channel count system.Also there is the minority radioactive substance monitoring system to use the multipotency window setting technique to distinguish the different radioactive sources that can distinguish.The disadvantage of these systems is exactly the kind that is difficult to judge exactly radioactive source, and this just makes that harmless naturally occurring radioactive substance (potash fertilizer, pottery etc.) triggers a lot of false alarms in the goods, brings a lot of troubles to the staff.
The detector that employing has the nuclide identification ability can address this problem to a certain extent, but costing an arm and a leg of this type systematic can't popularize.
Therefore need a kind of radioactive substance monitoring system cheaply, it can reduce the false alarm rate that is caused by naturally occurring radioactive substance (being called for short NORM, Naturally Occurring Radioactive Material) greatly.
Summary of the invention
Task of the present invention is to provide a kind of improved radioactive substance monitoring system; It can utilize the difference of the external characteristic of naturally occurring radioactive substance and artificial radioactivity material to suppress the counting that naturally occurring radioactive substance produces through on the searching surface of detector, increasing collimating grid, thereby reaches the purpose that reduces false alarm rate.
This task is through solving according to radioactive substance monitoring system of the present invention.
Comprise the detector that is used for radiomaterial is counted and generation is reported to the police according to counting according to radioactive substance monitoring system of the present invention; It is characterized in that; On the searching surface of this detector, collimating grid is installed, is used to reduce the counting that produces by naturally occurring radioactive substance.
The present invention based on understanding be that the common volume of goods that contains the naturally occurring radioactive substance that can cause the monitoring system false alarm is big (otherwise transmitted intensity can't trigger warning), naturally occurring radioactive substance is evenly dispersed in the whole goods; And the common volume of man-made source less (being point-like), activity ratio is more concentrated.If before the searching surface of detector, collimating grid is installed, detector all can descend to the detection counting of two types of radioactive sources (naturally occurring radioactive substance and man-made source) to some extent so; Because the activity ratio of naturally occurring radioactive substance is disperseed, its overall dimension is again much larger than detector, and therefore, the explorer count meeting that is produced by naturally occurring radioactive substance declines to a great extent; On the contrary, because the artificial radioactivity volume source is less with respect to detector, therefore, the explorer count that is produced by man-made source then can not receive very big influence.So, both can reduce the error-alert degree that brings by naturally occurring radioactive substance to a certain extent, not influence monitoring simultaneously again other radiomaterial.
In a preferred embodiment of the invention, said detector is a plastic scintillator detector.
In a preferred embodiment of the invention, the several certificates of the grid of the said collimating grid naturally occurring radioactive substance that will reach suppresses effect and selects with the detection sensitivity that will reach.
In a preferred embodiment of the invention, the size of said collimating grid is selected with the detection sensitivity that will reach according to the naturally occurring radioactive substance inhibition effect that will reach.
In a preferred embodiment of the invention, said collimating grid is the metal collimating grid.The grid metal is preferably heavy metal, for example plumbous.
In a preferred embodiment of the invention, the thickness of grid metal is selected according to effect that stops the ray that naturally occurring radioactive substance produces that will reach and the detection sensitivity that will reach.
Radioactive substance monitoring system of the present invention is applicable to any place that need carry out Monitoring and Controlling to radiomaterial, and for example customs port, nuclear physics laboratory, nuclear power station, nuke rubbish are buried place or storage, hospital, weapon manufacturing plant etc.
Compare characteristics such as that the present invention has is reasonable in design, wide accommodation, false alarm rate are low, detection sensitivity height with prior art.
Description of drawings
In conjunction with accompanying drawing, will more complete understanding be arranged to the present invention with reference to following detailed description, and can be well understood to advantage of the present invention more, wherein:
Fig. 1 is the structural representation according to radioactive material detection system of the present invention;
Fig. 2 is the principle of work synoptic diagram of the radioactive material detection system of prior art; And
Fig. 3 is the principle of work synoptic diagram according to radioactive material detection system of the present invention.
Embodiment
Now, will embodiments of the invention at length be described with reference to accompanying drawing.At this, should be understood that: the description of following examples is not a limitation of the present invention, but illustrates of the present invention.
Fig. 1 is the structural representation according to radioactive material detection system of the present invention, wherein this radioactive material detection system comprise be used for to radiomaterial count and the detector 1 of produce reporting to the police according to counting be installed in the collimating grid 2 on this detector 1.In Fig. 1, left side figure is the front elevation of the detector 1 behind the installation collimating grid 2, and right figure is the side view of the detector 1 behind the installation collimating grid 2.As can from figure, find out, collimating grid 2 is installed on the searching surface of detector 1, is close together with searching surface.
In an embodiment of the present invention, this detector 1 is a plastic scintillator detector, and other detector also can be imagined certainly.
In an embodiment of the present invention, the size of collimating grid 2 and grid number can be confirmed according to concrete needs.The length of collimating grid 2 or width or area are big more, and the area of searching surface that blocks detector 1 is just big more, just more little to the detection counting of other radioactive source, therefore just poor more to the detection sensitivity of other radioactive source.In addition; The grid number is many more, and the visual angle of detector is just more little, has only comparison could get into detector and produce counting over against the ray of detector; Therefore the effect that suppresses naturally occurring radioactive substance is just good more; And the area that blocks detector simultaneously is just big more, and is just more little to the detection counting of other radioactive source, therefore just poor more to the detection sensitivity of other radioactive source; Otherwise the grid number is few more, and the effect that suppresses naturally occurring radioactive substance is just poor more, and is just good more to the detection sensitivity of other radioactive source.Therefore, the size of collimating grid and grid number should be selected with the detection sensitivity that will reach according to the naturally occurring radioactive substance inhibition effect that will reach respectively.
In an embodiment of the present invention, collimating grid 2 is the metal collimating grid.For the ray that stops that effectively naturally occurring radioactive substance produces, should suitably select the material and the thickness of grid metal.Because the grid metal is thick more, stop that the effect of the ray that naturally occurring radioactive substance produces is just good more, but just poor more to the detection sensitivity of other radioactive source simultaneously, so the preferably thin heavy metal of grid metal, for example plumbous.
Fig. 2 is the principle of work synoptic diagram of the radioactive material detection system of prior art.Under the situation of this detection system, before radiomaterial got into detection channels, the ray that radiomaterial produced had produced counting on detector, and this is useful for man-made source, and this is harmful to for naturally occurring radioactive substance.Shown in Fig. 2 (b), 2 (c); Do not having under the situation of collimating grid, no matter goods is in which position, and all rays that naturally occurring radioactive substance sent all can arrive detector in the goods; Can cause the counting of detector higher like this, thereby false alarm rate is also higher.
Fig. 3 is the principle of work synoptic diagram according to radioactive material detection system of the present invention.Shown in Fig. 3 (b), 3 (c); Be equipped with on the searching surface of detector under the situation of collimating grid; The ray that the interior naturally occurring radioactive substance in zone that has only the inlet point line to identify sends just can arrive detector; Make detector produce counting, and said zone generally is very little with respect to goods, so collimating grid can reduce the counting that is caused by naturally occurring radioactive substance effectively.
Shown in Fig. 2 (a), 3 (a), for the less man-made source of volume, be equipped with on the searching surface of detector under the situation of collimating grid, only after having got into said zone, man-made source just can make detector produce counting.Because man-made source is little to the contribution of explorer count outside said zone, therefore collimating grid is installed not is very big to the influence of the counting that man-made source produced.
Based on above-mentioned principle of work; Can the metal collimating grid be installed on the searching surface of plastic scintillator detector; So not only can reduce the caused error-alert degree of the goods that contains naturally occurring radioactive substance; Can also keep the detection sensitivity to man-made source basically simultaneously, be to kill two birds with one stone.
Although the present invention has been described with reference to embodiments of the invention in the front, those skilled in the art can carry out various modifications and improvement to said embodiment without departing from the scope of the invention.
Claims (8)
1. method that is used to reduce the false alarm rate when utilizing radioactive substance monitoring system that radiomaterial is monitored; Said radioactive substance monitoring system comprises detector; Radiomaterial is counted and produce to be reported to the police through this detector according to counting
It is characterized in that, on the searching surface of this detector, collimating grid is installed, be used to reduce the counting that produces by naturally occurring radioactive substance, thereby reduce false alarm rate by naturally occurring radioactive substance caused.
2. method according to claim 1, wherein, plastic scintillator detector is used as said detector.
3. method according to claim 1, wherein, the naturally occurring radioactive substance that the several certificates of the grid of said collimating grid will reach suppresses effect and selects with the detection sensitivity that will reach.
4. method according to claim 1, wherein, the size of said collimating grid suppresses effect according to the naturally occurring radioactive substance that will reach and selects with the detection sensitivity that will reach.
5. method according to claim 1, wherein, the metal collimating grid is used as said collimating grid.
6. method according to claim 5, wherein, the grid metal is a heavy metal.
7. method according to claim 6, wherein, the grid metal is plumbous.
8. method according to claim 5, wherein, the thickness of grid metal is selected according to effect that stops the ray that naturally occurring radioactive substance produces that will reach and the detection sensitivity that will reach.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104535149A CN102608644A (en) | 2008-11-18 | 2008-11-18 | Radioactive substance monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104535149A CN102608644A (en) | 2008-11-18 | 2008-11-18 | Radioactive substance monitoring system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810227003A Division CN101738627A (en) | 2008-11-18 | 2008-11-18 | Radioactive substance monitoring system |
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| CN102608644A true CN102608644A (en) | 2012-07-25 |
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| CN2011104535149A Pending CN102608644A (en) | 2008-11-18 | 2008-11-18 | Radioactive substance monitoring system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2352969Y (en) * | 1998-12-04 | 1999-12-08 | 中国人民解放军57607部队 | Broad measuring and quick radiation measuring device using scintillation detector |
| CN2771855Y (en) * | 2005-03-02 | 2006-04-12 | 北京埃索特核电子机械有限公司 | Container internal nuclear material and its radioactive matter detecting device |
| US7064333B2 (en) * | 2003-10-20 | 2006-06-20 | Japan Nuclear Cycle Development Institute | Direction sensitive detector of radiation |
| US20060284094A1 (en) * | 2005-02-04 | 2006-12-21 | Dan Inbar | Detection of nuclear materials |
| CN1912651A (en) * | 2005-08-10 | 2007-02-14 | 西门子公司 | Detector module, detector and computer tomography |
| US20070034808A1 (en) * | 2005-04-27 | 2007-02-15 | Applied Research Associates, Inc. | Method and system for detection and identification of rapidly moving radioactive sources |
| CN101762613A (en) * | 2008-12-24 | 2010-06-30 | 同方威视技术股份有限公司 | Combination device of detector and collimator for X-ray examination and method |
-
2008
- 2008-11-18 CN CN2011104535149A patent/CN102608644A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2352969Y (en) * | 1998-12-04 | 1999-12-08 | 中国人民解放军57607部队 | Broad measuring and quick radiation measuring device using scintillation detector |
| US7064333B2 (en) * | 2003-10-20 | 2006-06-20 | Japan Nuclear Cycle Development Institute | Direction sensitive detector of radiation |
| US20060284094A1 (en) * | 2005-02-04 | 2006-12-21 | Dan Inbar | Detection of nuclear materials |
| CN2771855Y (en) * | 2005-03-02 | 2006-04-12 | 北京埃索特核电子机械有限公司 | Container internal nuclear material and its radioactive matter detecting device |
| US20070034808A1 (en) * | 2005-04-27 | 2007-02-15 | Applied Research Associates, Inc. | Method and system for detection and identification of rapidly moving radioactive sources |
| CN1912651A (en) * | 2005-08-10 | 2007-02-14 | 西门子公司 | Detector module, detector and computer tomography |
| CN101762613A (en) * | 2008-12-24 | 2010-06-30 | 同方威视技术股份有限公司 | Combination device of detector and collimator for X-ray examination and method |
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Application publication date: 20120725 |