CN103645491A - Method, device and system for radioactive source positioning - Google Patents
Method, device and system for radioactive source positioning Download PDFInfo
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- CN103645491A CN103645491A CN201310602906.6A CN201310602906A CN103645491A CN 103645491 A CN103645491 A CN 103645491A CN 201310602906 A CN201310602906 A CN 201310602906A CN 103645491 A CN103645491 A CN 103645491A
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Abstract
The invention discloses a method, a device and a system for radioactive source positioning. The method comprises the steps of acquiring a relation between a crystal count ratio in a crystal array of a detector and the radioactive source angle according to analog data; measuring the actual crystal count of the crystal array when the radioactive source under test radiates rays; acquiring a plurality of denoising crystal count ratios according to the actual crystal count and the various count noises within a variation range of count noises, acquiring actual radioactive source angles corresponding to the denoising crystal count ratios according to the relation between the crystal count ratio and the radioactive source angle, and selecting the actual radioactive source angle when the count noises are optimum as the radioactive source angle of the radioactive source under test. The device comprises a processing module, a measuring module and a calculating module. The system comprises a radioactive source positioning device, the radioactive source under test and the detector. According to the invention, the crystal count ration is adopted to act as a calculation parameter, effectively noise deducting technologies are adopted, and the sensitivity and the accuracy of radioactive source positioning are improved.
Description
Technical field
The present invention relates to radioactive source Detection Techniques, particularly a kind of radioactive source localization method, Apparatus and system.
Background technology
Radioactive source is surveyed can be widely used in various radioactive environments, as laboratory, nuclear power plant, nuclear fuel factory, large-scale heavy ion accelerator, radioactive source storehouses etc.Varied for surveying the detector of gamma ray, at present more advanced technology is to utilize the particle in gamma ray can be by the principle of the absorption of crystals such as cesium iodide (CsI) or bismuth germanium oxide (BGO), adopt four crystal composition 2 * 2 crystal arrays, same radioactive source is surveyed and counted, according to the counter angle of releasing radioactive source of the count value of each piece crystal, to determine the orientation of radioactive source.
But when the position of radioactive source and crystal array be not at grade time, the radioactive source angle calculating is not accurate enough, makes positional accuracy low; Meanwhile, because crystal count value is not obvious with the variation of angle, make the sensitivity of existing radioactive source localization method not high, resolution characteristic is on the low side.
Summary of the invention
Provide hereinafter about brief overview of the present invention, to the basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is determined key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only that the form of simplifying provides some concept, usings this as the preorder in greater detail of discussing after a while.
The invention provides a kind of radioactive source localization method, Apparatus and system, in order to solve the defect that in prior art, radioactive source positional accuracy is low and sensitivity is low, realize the radioactive source location of high sensitivity, pin-point accuracy.
The invention provides a kind of radioactive source localization method, comprising:
Step S1, the relation according to crystal counting ratio in the crystal array of reason plan data acquisition detector with radioactive source angle;
Step S2, while measuring radioactive source to be measured radiation ray described in the actual measurement crystal counting of crystal array;
Step S3, counting noise variation range in, according to counting noise described in described actual measurement crystal counting and each, obtain a plurality of denoising crystal counting ratios, according to described crystal counting than with the Relation acquisition of radioactive source angle and described in each denoising crystal counting than the corresponding radioactive source angle of respectively surveying, and choose the radioactive source angle that the actual measurement radioactive source angle of described counting noise when optimum is described radioactive source to be measured.
The present invention also provides a kind of radioactive source locating device, comprising:
Processing module, for obtaining the crystal array crystal counting ratio of detector and the relation of radioactive source angle according to simulated data;
Measurement module, when measuring radioactive source to be measured radiation ray described in the actual measurement crystal counting of crystal array;
Computing module, in the variation range at counting noise, according to counting the described actual measurement crystal counting that noise and described measurement module measure described in each, obtain a plurality of denoising crystal counting ratios, the described crystal counting obtaining according to described processing module than with the Relation acquisition of radioactive source angle and described in each denoising crystal counting than the corresponding radioactive source angle of respectively surveying, and choose the radioactive source angle that the actual measurement radioactive source angle of described counting noise when optimum is described radioactive source to be measured.
The present invention also provides a kind of radioactive source positioning system, comprising: above-mentioned radioactive source locating device, radioactive source to be measured and detector.
Radioactive source localization method provided by the invention, Apparatus and system, adopt crystal counting to be compared to calculating parameter, make parameter obvious with the variation of radioactive source angle, adopt effectively deduction noise technique, for the radioactive source situation in crystal array plane not, can effectively improve changed factor relevant with radioactive source angle in parameter, avoid the defect of prior art, improve sensitivity and the accuracy of radioactive source location.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the process flow diagram of radioactive source localization method the first embodiment of the present invention;
Fig. 2 is the process flow diagram of radioactive source localization method the second embodiment of the present invention;
Fig. 3 is the schematic diagram of 2 * 2 crystal arrays of embodiment of the present invention employing;
Fig. 4 is the graph of a relation that embodiment of the present invention radioactive source angle and crystal are counted ratio;
Fig. 5 is the structural representation of radioactive source locating device the first embodiment of the present invention;
Fig. 6 is the structural representation of radioactive source locating device the second embodiment of the present invention;
Fig. 7 is the system chart of radioactive source positioning system embodiment of the present invention.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.The element of describing in an accompanying drawing of the present invention or a kind of embodiment and feature can combine with element and feature shown in one or more other accompanying drawing or embodiment.It should be noted that for purposes of clarity, in accompanying drawing and explanation, omitted expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and processing.Embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not paying creative work, belongs to the scope of protection of the invention.
Fig. 1 is the process flow diagram of radioactive source localization method the first embodiment of the present invention.As shown in Figure 1, the embodiment of the present invention provides a kind of radioactive source localization method, comprising:
Step S10, according to simulated data, obtain in the crystal array of detector crystal counting than the relation with radioactive source angle, wherein, crystal counting than the counting for adjacent two crystal in crystal array and with the counting of crystal array and ratio;
Step S20, the actual measurement crystal counting of crystal array while measuring radioactive source to be measured radiation ray, wherein, actual measurement crystal counting is the crystal counting that crystal array actual measurement obtains;
Step S30, counting noise variation range in, according to actual measurement crystal, count and respectively count noise and obtain a plurality of denoising crystal counting ratios, according to crystal counting than the Relation acquisition with radioactive source angle and each denoising crystal counting than the corresponding radioactive source angle of respectively surveying, and choose the radioactive source angle that the actual measurement radioactive source angle of counting noise when optimum is radioactive source to be measured, wherein, denoising crystal counting is than the crystal counting ratio for utilizing the crystal after denoising to calculate.
In embodiments of the present invention, first according to simulated data, obtain crystal counting than the relation with radioactive source angle, this simulated data is that situation about being placed on same plane by simulation softward simulated emission source and crystal array obtains, and counts noise and can be considered zero in thus obtained relation.Then, for certain environment to be measured, utilize the crystal array of above-mentioned detector to measure actual measurement crystal counting.When radioactive source to be measured and crystal array be not at grade time, counting on all crystals is all by the counting higher than at grade, the increase of this counting (being counting noise) makes crystal counting than departing from above-mentioned crystal counting than the relation with radioactive source angle.Therefore, can determine according to concrete measured data the variation range of counting noise.Actual measurement crystal counting is carried out to denoising, obtain denoising crystal counting ratio, and obtain the actual measurement radioactive source angle corresponding with it.Finally, in the variation range of counting noise, the actual measurement radioactive source angle while choosing counting noise optimum, as the radioactive source angle of radioactive source to be measured.
The radioactive source localization method that the embodiment of the present invention provides, adopt crystal counting to be compared to calculating parameter, make parameter obvious with the variation of radioactive source angle, adopt effectively deduction noise technique, for the radioactive source situation in crystal array plane not, can effectively improve changed factor relevant with radioactive source angle in parameter, avoid the defect of prior art, improve sensitivity and the accuracy of radioactive source location.
Fig. 2 is the process flow diagram of radioactive source localization method the second embodiment of the present invention.As shown in Figure 2, on the basis of said method the first embodiment, above-mentioned crystal array can be 2 * 2 crystal arrays, and above-mentioned steps S10 can further specifically comprise:
Step S101, in 2 * 2 crystal arrays an optional crystal as reference crystal;
Step S102, with reference to crystal and a crystal being adjacent, be combined as first crystal group, with reference to crystal and another piece crystal of being adjacent, be combined as the second crystal group;
Step S103, the first crystal counting that utilizes simulation softward to measure first crystal group compare BC than the second crystal counting of AB and the second crystal group, wherein, AB=(A+B)/(A+B+C+D), BC=(B+C)/(A+B+C+D), A, B, C and D are followed successively by the crystal counting of four crystal in this 2 * 2 crystal array;
Step S104, respectively obtain first crystal counting than the discrete relationship of AB and radioactive source angle θ and the second crystal counting than the discrete relationship of BC and radioactive source angle θ;
Step S105, above-mentioned discrete relationship is fitted to linear relationship.
Fig. 3 is the schematic diagram of 2 * 2 crystal arrays of embodiment of the present invention employing.As shown in Figure 3, a, b, c and d are four crystal in 2 * 2 crystal arrays.If selecting crystal b is reference crystal, crystal a and crystal b are combined as to first crystal combination, crystal b and crystal c are combined as to the second crystal combination.A, B, C and D are followed successively by the counting of crystal a, b, c and d, utilize simulation softward to measure first crystal counting and compare BC than AB and the second crystal counting.Obtain respectively the discrete relationship of AB and θ and the discrete relationship of BC and θ.Fig. 4 is the graph of a relation that embodiment of the present invention radioactive source angle and crystal are counted ratio.As shown in Figure 4, the relation of AB and θ can be divided into two parts: θ ∈ (90 °, 90 °) and θ ∈ (90 °, 270 °), in two intervals, AB and θ relation all approach linear relationship.Equally, BC is also to approach linear relationship in θ ∈ (0 °, 180 °) and two intervals of θ ∈ (180 °, 360 °).Therefore, it is carried out to matching, obtain linear relationship θ=(AB-y1)/x1, θ=(BC-y2)/x2, wherein, x1, x2, y1 and y2 are Straight Line Fitting Parameters.
When the embodiment of the present invention is worked at detector, can directly calculate AB and BC by measuring, therefore can calculate θ by above-mentioned formula, calculate extremely simple, simultaneously as can be seen from Figure 4, crystal counting is than obvious with the variation of radioactive source angle, therefore locates sensitivity very high.
Further, during radioactive source radiation ray to be measured, the actual measurement crystal counting of crystal a, b, c and d can be counted A ', B ', C ' and D ' successively, and the variation range of counting noise N can be made as Nmin to Nmax.General N min can be made as 0, Nmax can be made as 60% of the middle minimum value of A ', B ', C ' and D '.Above-mentioned steps S30 can specifically comprise:
Step S301, counting noise N are set to Nmin;
Step S302, according to AB '=(A '+B '-2 * N)/(A '+B '+C '+D '-4 * N), obtain the first denoising crystal counting ratio, according to BC '=(B '+C '-2 * N)/(A '+B '+C '+D '-4 * N), obtain the second denoising crystal counting ratio;
Step S303, according to linear relationship, obtain radioactive source angle θ 1 and radioactive source angle θ 2 corresponding to BC ' that AB ' is corresponding;
Step S304, counting noise N are from adding 1;
Step S305, comparison | θ 1-θ 2| and
size,
with
for parameter preset, if
parameters
otherwise, parameter
with
constant;
Whether step S306, judgement counting noise N are greater than Nmax, if so, perform step S307, otherwise, execution step S302;
Step S307, basis
obtain the radioactive source angle of radioactive source to be measured.
When radioactive source to be measured and crystal array be not at grade time, the counting on all crystals is all by the counting higher than at grade, and the increase of this counting (being counting noise) makes crystal counting than the linearity curve shown in AB and BC slip chart 4.In the embodiment of the present invention, suppose that the counting noise on crystal a, b, c and d is N, obtain the crystal counting ratio after denoising:
AB’=（A’-N+B’-N）/（A’-N+B’-N+C’-N+D’-N）
=（A’+B’-2×N）/（A’+B’+C’+D’-4×N），
BC’=（B’-N+C’-N）/（A’-N+B’-N+C’-N+D’-N）
=（B’+C’-2×N）/（A’+B’+C’+D’-4×N）。
According to actual conditions, due to the same radioactive source of correspondence, angle should be identical.Therefore, definite method of counting noise is, continuously changes within the specific limits noise size, makes the angle that calculates by curve A B and curve B C the most approaching, and counting noise now, is and approaches the real optimum noise of counting most.The angle now calculating is and approaches real radioactive source actual angle most.
Radioactive source to be measured in the embodiment of the present invention can be gamma ray radioactive source.
The radioactive source localization method that the embodiment of the present invention provides, adopt crystal counting to be compared to calculating parameter, make parameter obvious with the variation of radioactive source angle, adopt effectively deduction noise technique, for the radioactive source situation in crystal array plane not, effectively remove unhelpful counting noise, can effectively improve changed factor relevant with radioactive source angle in parameter, avoid the defect of prior art, improved sensitivity and the accuracy of radioactive source location.
Fig. 5 is the structural representation of radioactive source locating device the first embodiment of the present invention.As shown in Figure 5, the embodiment of the present invention provides a kind of radioactive source locating device, comprising: processing module 51, measurement module 52 and computing module 53.Wherein, processing module 51 is for obtaining the crystal array crystal counting ratio of detector and the relation of radioactive source angle according to simulated data; The actual measurement crystal counting of crystal array when measurement module 52 radiates ray for measuring radioactive source to be measured; Computing module 53 is in the variation range at counting noise, the actual measurement crystal counting measuring according to each counting noise and measurement module 52 obtains a plurality of denoising crystal counting ratios, the crystal counting obtaining according to processing module 51 than the corresponding radioactive source angle of respectively surveying, and is chosen the radioactive source angle that the actual measurement radioactive source angle of counting noise when optimum is radioactive source to be measured than the Relation acquisition with radioactive source angle and each denoising crystal counting.
In embodiments of the present invention, first processing module 51 is obtained crystal counting than the relation with radioactive source angle according to simulated data, wherein, crystal counting than the counting for adjacent two crystal in crystal array and with the counting of crystal array and ratio.This simulated data is that situation about being placed on same plane by simulation softward simulated emission source and crystal array obtains, and thus obtained crystal counting can be considered zero than counting noise in the relation with radioactive source angle.Then, for certain environment to be measured, measurement module 52 utilizes the crystal array of above-mentioned detector to measure actual measurement crystal counting.When radioactive source to be measured and crystal array be not at grade time, the counting on all crystals is all by the counting higher than at grade, and the increase of this counting (being counting noise) makes crystal counting than departing from above-mentioned linear relationship.Therefore, computing module 53 can be determined according to concrete measured data the variation range of counting noise.Actual measurement crystal counting is carried out to denoising, obtain denoising crystal counting ratio, and obtain the actual measurement radioactive source angle corresponding with it.Finally, in the variation range of counting noise, the actual measurement radioactive source angle while choosing counting noise optimum, as the radioactive source angle of radioactive source to be measured.
The radioactive source locating device that the embodiment of the present invention provides, adopt crystal counting to be compared to calculating parameter, make parameter obvious with the variation of radioactive source angle, adopt effectively deduction noise technique, for the radioactive source situation in crystal array plane not, can effectively improve changed factor relevant with radioactive source angle in parameter, avoid the defect of prior art, improve sensitivity and the accuracy of radioactive source location.
Fig. 6 is the structural representation of radioactive source locating device the second embodiment of the present invention.As shown in Figure 6, on the basis of said apparatus the first embodiment, above-mentioned crystal array can be 2 * 2 crystal arrays, and above-mentioned processing module 51 may further include: chooser module 61, measurement submodule 62, first are processed submodule 63 and matching submodule 64.Wherein, chooser module 61 at the optional crystal of 2 * 2 crystal arrays as reference crystal, with reference to crystal and a crystal being adjacent, be combined as first crystal group, with reference to crystal and another piece crystal of being adjacent, be combined as the second crystal group; Measure submodule 62 and than the second crystal counting of AB and the second crystal group, compare BC for the first crystal counting that utilizes simulation softward to measure first crystal group, wherein, AB=(A+B)/(A+B+C+D), BC=(B+C)/(A+B+C+D), A, B, C and D are followed successively by the crystal counting of four crystal in this 2 * 2 crystal array; First processes submodule 63 counts than the discrete relationship of BC and radioactive source angle θ with discrete relationship and the second crystal of radioactive source angle θ than AB for obtaining respectively first crystal counting; Matching submodule 64 fits to linear relationship for the discrete relationship that above-mentioned the first processing submodule 63 is got.
In Fig. 3, a, b, c and d are four crystal in 2 * 2 crystal arrays.If it is reference crystal that chooser module 61 is selected crystal b, crystal a and crystal b are combined as to first crystal combination, crystal b and crystal c are combined as to the second crystal combination.A, B, C and D are followed successively by the counting of crystal a, b, c and d, measure submodule 62 and utilize simulation softward measurement first crystal counting to compare BC than AB and the second crystal counting.First processes submodule 63 obtains respectively the discrete relationship of AB and θ and the discrete relationship of BC and θ.As shown in Figure 4, the relation of AB and θ can be divided into two parts: θ ∈ (90 °, 90 °) and θ ∈ (90 °, 270 °), in two intervals, AB and θ relation all approach linear relationship.Equally, BC is also to approach linear relationship in θ ∈ (0 °, 180 °) and two intervals of θ ∈ (180 °, 360 °).Therefore, matching submodule 64 carries out matching to it, obtains linear relationship θ=(AB-y1)/x1, θ=(BC-y2)/x2, and wherein, x1, x2, y1 and y2 are Straight Line Fitting Parameters.
When the embodiment of the present invention is worked at detector, can directly calculate AB and BC by measuring, therefore can calculate θ by above-mentioned formula, calculate extremely simple, simultaneously as can be seen from Figure 4, crystal counting is than obvious with the variation of radioactive source angle, therefore locates sensitivity very high.
Further, during radioactive source radiation ray to be measured, the actual measurement crystal counting of crystal a, b, c and d can be counted A ', B ', C ' and D ' successively, and the variation range of counting noise N can be made as Nmin to Nmax.General N min can be made as 0, Nmax can be made as 60% of the middle minimum value of A ', B ', C ' and D '.
Above-mentioned computing module 53 can specifically comprise: submodule 65, the first calculating sub module 66, the second processing submodule 67 are set, certainly add submodule 68, comparison sub-module 69, judge submodule 71 and the second calculating sub module 72.Wherein, submodule 65 is set and is set to Nmin for counting noise N; The first calculating sub module 66 is for obtaining the first denoising crystal counting ratio according to AB '=(A '+B '-2 * N)/(A '+B '+C '+D '-4 * N), according to BC '=(B '+C '-2 * N)/(A '+B '+C '+D '-4 * N), obtains the second denoising crystal counting ratio; Second processes submodule 67 for obtain radioactive source angle θ 1 and radioactive source angle θ 2 corresponding to BC ' that AB ' is corresponding according to the linear relationship of matching submodule 64 matchings; From adding submodule 68 for counting noise N is added to 1 certainly; Comparison sub-module 69 is for relatively | θ 1-θ 2| and
size,
with
for parameter preset, if
parameters
otherwise, parameter
with
constant; Judge submodule 71 is for judging from adding the counting noise N that submodule 68 draws whether be greater than Nmax; The second calculating sub module 72 is for when counting noise N is greater than Nmax, according to
obtain the radioactive source angle of radioactive source to be measured.
When radioactive source to be measured and crystal array be not at grade time, the counting on all crystals is by all higher than counting at grade, and the increase of this counting (being counting noise) makes crystal counting than the linearity curve shown in AB and BC slip chart 4.In the embodiment of the present invention, suppose that the counting noise on crystal a, b, c and d is N, obtain the crystal counting ratio after denoising:
AB’=（A’-N+B’-N）/（A’-N+B’-N+C’-N+D’-N）
=（A’+B’-2×N）/（A’+B’+C’+D’-4×N），
BC’=（B’-N+C’-N）/（A’-N+B’-N+C’-N+D’-N）
=（B’+C’-2×N）/（A’+B’+C’+D’-4×N）。
According to actual conditions, due to the same radioactive source of correspondence, angle should be identical.Therefore, continuously change within the specific limits noise size, make the angle that calculates by curve A B and curve B C the most approaching, counting noise now, is and approaches real optimum counting noise most.The angle now calculating is and approaches real radioactive source actual angle most.
Radioactive source to be measured in the embodiment of the present invention can be gamma ray radioactive source.
The radioactive source locating device that the embodiment of the present invention provides, adopt crystal counting to be compared to calculating parameter, make parameter obvious with the variation of radioactive source angle, adopt effectively deduction noise technique, for the radioactive source situation in crystal array plane not, effectively remove unhelpful counting noise, can effectively improve changed factor relevant with radioactive source angle in parameter, avoid the defect of prior art, improved sensitivity and the accuracy of radioactive source location.
Fig. 7 is the system chart of radioactive source positioning system embodiment of the present invention.As shown in Figure 7, the embodiment of the present invention provides a kind of radioactive source status system, comprising: radioactive source locating device 73, radioactive source to be measured 74 and detector 75.Radioactive source locating device 73 obtains crystal counting in detector 75 according to simulated data and, than the relation with radioactive source angle, then according to this relation, calculates the radioactive source angle of radioactive source 74 to be measured.
In native system embodiment, the function of radioactive source locating device 73, as the specific descriptions in above-mentioned Fig. 5 and Fig. 6 shown device embodiment, does not repeat them here.
Radioactive source to be measured 74 in the embodiment of the present invention can be gamma ray radioactive source.
The radioactive source positioning system that the embodiment of the present invention provides, adopt crystal counting to be compared to calculating parameter, make parameter obvious with the variation of radioactive source angle, adopt effectively deduction noise technique, for the radioactive source situation in crystal array plane not, effectively remove unhelpful counting noise, can effectively improve changed factor relevant with radioactive source angle in parameter, avoid the defect of prior art, improved sensitivity and the accuracy of radioactive source location.
In the various embodiments described above of the present invention, the sequence number of embodiment is only convenient to describe, and does not represent the quality of embodiment.Description to each embodiment all emphasizes particularly on different fields, and there is no the part of detailed description in certain embodiment, can be referring to the associated description of other embodiment.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of programmed instruction, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM (read-only memory) (Read-Only Memory is called for short ROM), random access memory (Random Access Memory is called for short RAM), magnetic disc or CDs.
In the embodiment such as apparatus and method of the present invention, obviously, each parts or each step reconfigure after can decomposing, combine and/or decomposing.These decomposition and/or reconfigure and should be considered as equivalents of the present invention.Simultaneously, in the above in the description of the specific embodiment of the invention, the feature of describing and/or illustrating for a kind of embodiment can be used in same or similar mode in one or more other embodiment, combined with the feature in other embodiment, or substitute the feature in other embodiment.
Should emphasize, term " comprises/comprises " existence that refers to feature, key element, step or assembly while using herein, but does not get rid of the existence of one or more further feature, key element, step or assembly or add.
Finally it should be noted that: although described above the present invention and advantage thereof in detail, be to be understood that in the situation that do not exceed the spirit and scope of the present invention that limited by appended claim and can carry out various changes, alternative and conversion.And scope of the present invention is not limited only to the specific embodiment of the described process of instructions, equipment, means, method and step.One of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use carry out with the essentially identical function of corresponding embodiment described herein or obtain process, equipment, means, method or step result essentially identical with it, that existing and will be developed future according to the present invention.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.
Claims (10)
1. a radioactive source localization method, is characterized in that, comprising:
Step S1, according to simulated data, obtain in the crystal array of detector crystal counting than the relation with radioactive source angle;
Step S2, while measuring radioactive source to be measured radiation ray described in the actual measurement crystal counting of crystal array;
Step S3, counting noise variation range in, according to counting noise described in described actual measurement crystal counting and each, obtain a plurality of denoising crystal counting ratios, according to described crystal counting than with the Relation acquisition of radioactive source angle and described in each denoising crystal counting than the corresponding radioactive source angle of respectively surveying, and choose the radioactive source angle that the actual measurement radioactive source angle of described counting noise when optimum is described radioactive source to be measured.
2. radioactive source localization method according to claim 1, is characterized in that, described crystal array is 2 * 2 crystal arrays, and described step S1 comprises:
Step S11, in described 2 * 2 crystal arrays an optional crystal as reference crystal;
Step S12, described reference crystal and a crystal being adjacent are combined as to first crystal group, described reference crystal and another piece crystal of being adjacent are combined as to the second crystal group;
Step S13, the first crystal counting that utilizes simulation softward to measure described first crystal group compare BC than the second crystal counting of AB and described the second crystal group, wherein, AB=(A+B)/(A+B+C+D), BC=(B+C)/(A+B+C+D), A, B, C and D are followed successively by the crystal counting of four crystal in described 2 * 2 crystal arrays;
Step S14, respectively obtain described first crystal counting than the discrete relationship of AB and described radioactive source angle θ and described the second crystal counting than the discrete relationship of BC and described radioactive source angle θ;
Step S15, described discrete relationship is fitted to linear relationship.
3. radioactive source localization method according to claim 2, it is characterized in that, during described radioactive source radiation ray to be measured, in described 2 * 2 crystal arrays, the actual measurement crystal of four crystal counting is followed successively by A ', B ', C ' and D ', the variation range of described counting noise is Nmin to Nmax, and described step S3 comprises:
Step S31, described counting noise N are set to Nmin;
Step S32, according to AB '=(A '+B '-2 * N)/(A '+B '+C '+D '-4 * N), obtain the first denoising crystal counting ratio, according to BC '=(B '+C '-2 * N)/(A '+B '+C '+D '-4 * N), obtain the second denoising crystal counting ratio;
Step S33, according to described linear relationship, obtain radioactive source angle θ 1 and radioactive source angle θ 2 corresponding to BC ' that AB ' is corresponding;
Step S34, described counting noise N are from adding 1;
Step S35, comparison | θ 1-θ 2| and
size,
with
for parameter preset, if |
parameters
otherwise, parameter
with
constant;
Step S36, judge whether described counting noise N is greater than Nmax, if so, performs step S37, otherwise, execution step S32;
Step S37, basis
obtain the radioactive source angle of described radioactive source to be measured.
4. according to the radioactive source localization method described in claim 2 or 3, it is characterized in that, described linear relationship is θ=(AB-y1)/x1, θ=(BC-y2)/x2, and wherein, x1, x2, y1 and y2 are Straight Line Fitting Parameters.
5. a radioactive source locating device, is characterized in that, comprising:
Processing module, for obtaining the crystal array crystal counting ratio of detector and the relation of radioactive source angle according to simulated data;
Measurement module, when measuring radioactive source to be measured radiation ray described in the actual measurement crystal counting of crystal array;
Computing module, in the variation range at counting noise, according to counting the described actual measurement crystal counting that noise and described measurement module measure described in each, obtain a plurality of denoising crystal counting ratios, the described crystal counting obtaining according to described processing module than with the Relation acquisition of radioactive source angle and described in each denoising crystal counting than the corresponding radioactive source angle of respectively surveying, and choose the radioactive source angle that the actual measurement radioactive source angle of described counting noise when optimum is described radioactive source to be measured.
6. radioactive source locating device according to claim 5, is characterized in that, described crystal array is 2 * 2 crystal arrays, and described processing module comprises:
Chooser module, be used at the optional crystal of described 2 * 2 crystal arrays as reference crystal, described reference crystal and a crystal being adjacent are combined as to first crystal group, described reference crystal and another piece crystal of being adjacent are combined as to the second crystal group;
Measure submodule, for the first crystal counting that utilizes simulation softward to measure described first crystal group, than the second crystal counting of AB and described the second crystal group, compare BC, wherein, AB=(A+B)/(A+B+C+D), BC=(B+C)/(A+B+C+D), A, B, C and D are followed successively by the crystal counting of four crystal in described 2 * 2 crystal arrays;
First processes submodule, for obtaining respectively described first crystal counting, than AB, counts than the discrete relationship of BC and described radioactive source angle θ with discrete relationship and described the second crystal of described radioactive source angle θ;
Matching submodule, fits to linear relationship for the described discrete relationship that described the first processing submodule is got.
7. radioactive source locating device according to claim 6, it is characterized in that, during described radioactive source radiation ray to be measured, in described 2 * 2 crystal arrays, the actual measurement crystal of four crystal counting is followed successively by A ', B ', C ' and D ', the variation range of described counting noise is Nmin to Nmax, and described computing module comprises:
Submodule is set, for described counting noise N, is set to Nmin;
The first calculating sub module, for obtaining the first denoising crystal counting ratio according to AB '=(A '+B '-2 * N)/(A '+B '+C '+D '-4 * N), according to BC '=(B '+C '-2 * N)/(A '+B '+C '+D '-4 * N), obtain the second denoising crystal counting ratio;
Second processes submodule, for obtain radioactive source angle θ 1 and radioactive source angle θ 2 corresponding to BC ' that AB ' is corresponding according to the described linear relationship of described matching submodule matching;
From adding submodule, for described counting noise N is added to 1 certainly;
Comparison sub-module, for relatively | θ 1-θ 2| and
size,
with
for parameter preset, if
parameters
otherwise, parameter
with
constant;
Whether judgement submodule, described be greater than Nmax from adding the described counting noise N that submodule draws for judging;
The second calculating sub module, for when described counting noise N is greater than Nmax, according to
obtain the radioactive source angle of described radioactive source to be measured.
8. according to the radioactive source locating device described in claim 6 or 7, it is characterized in that, the described linear relationship of described matching submodule matching is θ=(AB-y1)/x1, θ=(BC-y2)/x2, and wherein, x1, x2, y1 and y2 are Straight Line Fitting Parameters.
9. a radioactive source positioning system, is characterized in that, comprising: as radioactive source locating device, radioactive source to be measured and the detector as described in arbitrary in claim 5-8.
10. radioactive source positioning system according to claim 9, is characterized in that, described radioactive source to be measured is gamma ray radioactive source.
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