CN108595796A - The computational methods and medium of large space deep penetration radiation field Dose Rate - Google Patents
The computational methods and medium of large space deep penetration radiation field Dose Rate Download PDFInfo
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- CN108595796A CN108595796A CN201810320533.6A CN201810320533A CN108595796A CN 108595796 A CN108595796 A CN 108595796A CN 201810320533 A CN201810320533 A CN 201810320533A CN 108595796 A CN108595796 A CN 108595796A
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Abstract
The present invention provides a kind of computational methods and medium of large space deep penetration radiation field Dose Rate, wherein method includes：Scene three-dimensional modeling data is stored according to nuclear material and radiation source data builds computation of radiation field model；It is that flux turns dose mode by the calculating mode setting of the computation of radiation field model；Computational methods are set as the combination that detector method is combined with grid computing method；The Dose Rate of radiation field is calculated according to the calculating pattern and the computational methods.While the present invention realizes that radioactive source three dimensions radiation field Dose Rate overall distribution rule is grasped, obtain key point Dose Rate accurately calculates value.
Description
Technical field
The present invention relates to radioactive substance radiation field detection field more particularly to the calculating sides of large space deep penetration radiation field
Method is exactly specifically a kind of computational methods and medium of large space deep penetration radiation field Dose Rate.
Background technology
Complicated radiation field, related work can be formed in nuclear material storage space because of radioactive nucleus elements such as storage uranium, plutoniums
Personnel can cause certain by irradiation (nuclear radiation), nuclear radiation during daily maintenance, inspection of nuclear material etc. to its body
Kind detrimental effect, in order to effectively avoid detrimental effect of the nuclear radiation to staff's body, it is necessary to first know that nuclear material storage is empty
Between the radiation field distribution situation that is formed of inner nuclear material and its influence degree to staff, further according to radiation field distribution situation and
It carries out effective radiation protection to the influence degree of staff to staff.
In the prior art, computation of radiation field method includes mainly that Monte Carlo simulation, theoretical calculation and experiment measure, and is compared
For, Monte Carlo simulation can be to being not easy to measure radiation field or be unable to measure radiation field to analyze, and is not necessarily to excessively letter
Change it is assumed that the radiation field calculated is more close to actual complex situation, it is possible to prevente effectively from other methods are close because of a large amount of geometry
Like caused calculating error, and the inner behavior mechanism of radiation field can be disclosed, be acknowledged as calculating the most effective side of radiation field
Method.
But when directly calculating large-scale dimension deep penetration radiation field using Monte Carlo method there are convergence rate compared with
Slowly, the problems such as relative error is larger, the especially problem in the case where source item is complicated, space structure is asymmetric, space scale is larger
It is more obvious, and this problem cannot be simply by increasing the method solution for calculating number of particles, extending the calculating time.
Therefore, those skilled in the art need to develop a kind of overall distribution rule that can be grasped radioactive source and form radiation field
Rule, and can accurately calculate key point dosage rate, and the computation of radiation field method that computational efficiency is high, accuracy is high, to for
It realizes that the optimization of large space deep penetration radiation field Dose Rate calculates to lay the foundation.
Invention content
In view of this, the technical problem to be solved in the present invention is to provide a kind of large space deep penetration radiation field air absorption
The computational methods and medium of dosage rate, the overall distribution that radioactive source forms radiation field cannot accurately be grasped in the prior art by solving
Rule, the problem of key point dosage rate can not be accurately calculated.
In order to solve the above-mentioned technical problem, it is empty to provide a kind of large space deep penetration radiation field to specific implementation mode of the invention
The computational methods of aspiration dosage rate, including：Scene three-dimensional modeling data is stored according to nuclear material and radiation source data builds spoke
Penetrate field computation model；It is that flux turns dose mode by the calculating mode setting of the computation of radiation field model；Computational methods are set
It is set to the combination that detector method is combined with grid computing method；Spoke is calculated according to the calculating pattern and the computational methods
Penetrate the Dose Rate of field.
The specific implementation mode of the present invention also provides a kind of computer storage media including computer executed instructions, described
When computer executed instructions are handled via data processing equipment, which executes large space deep penetration radiation field air
The computational methods of absorbed dose rate.
Above-mentioned specific implementation mode according to the present invention it is found that large space deep penetration radiation field Dose Rate meter
Calculation method and medium at least have the advantages that：Using variance-reduction technique simultaneously to detector calculate and gridding method calculate into
Row subtracts variance processing and is obtained while realizing that radioactive source three dimensions radiation field Dose Rate overall distribution rule is grasped
To the value that accurately calculates of key point Dose Rate, and computational efficiency, computational accuracy are calculated far above directly simulation.
It is to be understood that above-mentioned general description and detailed description below are merely illustrative and illustrative, not
It can the limitation range of the invention to be advocated.
Description of the drawings
Following appended attached drawing is the part of specification of the present invention, depicts example embodiments of the present invention, institute
Attached drawing is used for illustrating the principle of the present invention together with the description of specification.
Fig. 1 is a kind of meter for large space deep penetration radiation field Dose Rate that the specific embodiment of the invention provides
The flow chart of the embodiment one of calculation method.
Fig. 2 is a kind of meter for large space deep penetration radiation field Dose Rate that the specific embodiment of the invention provides
The flow chart of the embodiment two of calculation method.
Fig. 3 is a kind of meter for large space deep penetration radiation field Dose Rate that the specific embodiment of the invention provides
The flow chart of the embodiment three of calculation method.
Fig. 4 A are that neutron transport in the prior art calculates design sketch.
Fig. 4 B are that the neutron transport based on Monte Carlo EGS4 method that the specific embodiment of the invention provides calculates design sketch.
Fig. 5 A are that the γ that (n, γ) is generated in the prior art transports calculating design sketch.
Fig. 5 B are that the γ that (n, the γ) based on Monte Carlo EGS4 method that the specific embodiment of the invention provides is generated transports meter
Calculate design sketch.
Fig. 6 A are that low energy γ transports calculating design sketch in the prior art.
Fig. 6 B are that the low energy γ based on Monte Carlo EGS4 method that the specific embodiment of the invention provides transports calculating design sketch.
Specific implementation mode
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will with attached drawing and in detail
Narration clearly illustrates that the spirit of disclosed content, any skilled artisan are understanding the content of present invention
After embodiment, when the technology that can be taught by the content of present invention, it is changed and modifies, without departing from the essence of the content of present invention
God and range.
The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but not as a limitation of the invention.
In addition, in the drawings and embodiments the use of element/component of same or like label is for representing same or like portion
Point.
About " first " used herein, " second " ... etc., not especially censure the meaning of order or cis-position,
It is non-to limit the present invention, only for distinguishing the element described with same technique term or operation.
About direction term used herein, such as：Upper and lower, left and right, front or rear etc. are only the sides of refer to the attached drawing
To.Therefore, the direction term used is intended to be illustrative and not intended to limit this creation.
It is the term of opening, i.e., about "comprising" used herein, " comprising ", " having ", " containing " etc.
Mean including but not limited to.
About it is used herein " and/or ", include the things any or all combinations.
Include " two " and " two or more " about " multiple " herein；Include " two groups " about " multigroup " herein
And " more than two ".
About term used herein " substantially ", " about " etc., to modify it is any can be with the quantity or mistake of microvariations
Difference, but this slight variations or error can't change its essence.In general, microvariations that such term is modified or error
Range in some embodiments can be 20%, in some embodiments can be 10%, can be in some embodiments 5% or its
His numerical value.It will be understood by those skilled in the art that the aforementioned numerical value referred to can be adjusted according to actual demand, it is not limited thereto.
It is certain describing the word of the application by lower or discuss in the other places of this specification, to provide art technology
Personnel's guiding additional in relation to the description of the present application.
Fig. 1 is a kind of meter for large space deep penetration radiation field Dose Rate that the specific embodiment of the invention provides
As shown in Figure 1, first building computation of radiation field model, then computation of radiation field pattern is arranged in the flow chart of the embodiment one of calculation method
And computational methods, the Dose Rate of radiation field is finally calculated using the calculating pattern and computational methods of setting.
In the specific implementation mode shown in the drawings, the computational methods of large space deep penetration radiation field Dose Rate
Including：
Step 101：Scene three-dimensional modeling data is stored according to nuclear material and radiation source data builds computation of radiation field model.
In the embodiment of the present invention, computation of radiation field model is built, nuclear material is stored in pail pack when storing, then presses by nuclear material
According to 3 × 3 arrangement mode be placed on the barrier shield of storehouse after.
Step 102：It is that flux turns dose mode by the calculating mode setting of the computation of radiation field model.The reality of the present invention
It applies in example, setting calculates in mode process, and choosing flux turns dose mode, need not track during each PARTICLE TRANSPORT FROM and object
The energy conversion that matter interaction generates, it is shorter and higher, accurate to air or the relatively low substance applicability of other density to calculate the time
Exactness is higher.
Step 103：Computational methods are set as the combination that detector method is combined with grid computing method.The present invention's
In embodiment, key point Dose Rate is accurately calculated using detector, using grid computing method to overall distribution
Rule is roughly calculated, and is realized and is obtained the accurate air absorbent of key point while radiation field overall distribution rule is grasped
Dose rate value.The grid computing method is that entire radiation field is divided into the particle calculated after multiple cubes in each cube
Number.
Step 104：The Dose Rate of radiation field is calculated according to the calculating pattern and the computational methods.
Referring to Fig. 1, mode setting will be calculated and be that flux turns dose mode, at the same detector is calculated and gridding method calculate into
Row subtracts variance processing, while improving the convergence of two methods, realizes that radioactive source three dimensions radiation field Dose Rate is whole
While the body regularity of distribution is grasped, the value that accurately calculates of key point Dose Rate is obtained, improves computational accuracy, is improved
Computational efficiency.
Fig. 2 is a kind of meter for large space deep penetration radiation field Dose Rate that the specific embodiment of the invention provides
The flow chart of the embodiment two of calculation method reads and shows as shown in Fig. 2, after the Dose Rate for calculating radiation field
The Dose Rate for showing radiation field, is checked for experimenter.
In the specific implementation mode shown in the drawings, after step 104, large space deep penetration radiation field air absorbed dose of radiation
The computational methods of rate further include：
Step 105：Read and show the Dose Rate of the radiation field.In the embodiment of the present invention, indicate empty
The file of aspiration dosage rate is INP files and data files, and the detector in INP files including key point calculates air suction
Dosage rate exact value is received, is directly read；Data files include that gridding method calculates the distribution of three dimensions Dose Rate
Coarse value can be used for three-dimensional spatial distribution law study, which needs to carry out data files to the conversion of TXT files, and
It is shown afterwards by three-dimensional visualization tool.
Referring to Fig. 2, the exact value of existing Dose Rate can be directly read, and have the absorption of three dimensions air
The rough Distribution Value of dosage rate, can be used for three-dimensional spatial distribution law study, and intuitive display is convenient for observation analysis.
Fig. 3 is a kind of meter for large space deep penetration radiation field Dose Rate that the specific embodiment of the invention provides
The flow chart of the embodiment three of calculation method, as shown in figure 3, exploitation right window variance-reduction technique, force collision are combined with exponential transform
Variance-reduction technique blocks the method guiding that variance-reduction technique is combined and contributes larger particle to setting Dose Rate
Detector where point acceleration transport, to increase computing unit population, improve computational efficiency and computational accuracy.
In the specific implementation mode shown in the drawings, step 104 specifically includes：
Step 1041：The key point in radiation field is arranged in detector.In the embodiment of the present invention, the key point
It is calculated according to staff's motion frequency, the setting of shielding object and radioactive source distance.
Step 1042：Mesh generation is carried out to the radiation field according to practical application scene and region-of-interest.The present invention's
In embodiment, the fineness of the mesh generation is determined according to pre- space distribution rule of grasping.According to practical application field
Scape and region-of-interest select mesh generation form.Mesh generation form includes cube grid, sphere grid and cylinder grid, net
Lattice divide thickness and determine that mesh generation can carefully increase very much calculated load, and grid is too by quasi- space distribution rule levels of precision of grasping
It is thick to influence computational accuracy, therefore according to actual demand and cost determination mesh generation should be calculated.
Step 1043：Using block subtract variance to the radiation field carry out space block.In the embodiment of the present invention, utilize
It blocks variance-reduction technique to block the opposite geometric space for not making much sense counting, considers record point position by room bottom
Cement thickness, room upper space and wall peripheral air size compression reduce PARTICLE TRANSPORT FROM bulk.
Step 1044：Utilization index transformation, force collision combination method guiding PARTICLE TRANSPORT FROM direction.The embodiment of the present invention
In, utilization index converter technique changes transporting particle microscopic cross in the medium to change the free path of particle in the medium,
To reduce particle in non-counting unit and material effect probability；It is improved using force collision method and contributes detection big count block
Particle encounter number, guiding particle enter counting unit.It should be noted that same lattice cell force collision and index variation phase
Conflict, but the two can be used in conjunction with each other in the calculation, further speeded up particle and entered counting region, improve and calculate effect
Rate.Step 1044 can specifically include：Utilization index converter technique adjusts the microscopic cross of transporting particle in the medium；Using force
Impaction improves the collision frequency of count block particle.The adjustment formula of the microscopic cross is：
Wherein,For the microscopic cross after adjustment；For prototype micro section；P is draw direction；μ is particle direction and drawing
Stretch the cosine of angle between direction.
Step 1045：Exploitation right window guides particle to counting unit Accelerating running, reduces and calculates variance.The implementation of the present invention
In example, step 1045 specifically includes：The energy range of the different grids of window generator joint acquisition is weighed by weighing window generator and energy
Between weigh window lower limit distribution file；Call the energy section power window lower limit distribution file that particle is guided to accelerate to transport to counting unit
Row.
Step 1046：Calculate the Dose Rate of the radiation field.In the embodiment of the present invention, with nuclear material storehouse
For storage usage scenario calculates：Radioactive source is low concentration plutonium, pail pack is the sandwich solid wood of stainless steel and lead, medium be air,
Wall is concrete, door is stainless steel, and room-sized is 10m × 9m × 3.5m.Exact value is calculated according to the above step that calculates, is obtained
Whole relatively directly calculate (the detector method) of relative error that calculating is transported to neutron, (n, γ) generation γ, low energy γ reduces
80%, 40% and 100%, it calculates quality factor and has been respectively increased 70 times, 9 times and 100 times.
Referring to Fig. 3, while realizing that radioactive source three dimensions radiation field Dose Rate overall distribution rule is grasped,
The value that accurately calculates of key point Dose Rate is obtained, and computational efficiency, computational accuracy are far above directly simulation meter
It calculates.
The specific implementation mode of the present invention also provides a kind of computer storage media including computer executed instructions, described
When computer executed instructions are handled via data processing equipment, which executes large space deep penetration radiation field air
The computational methods of absorbed dose rate.This approach includes the following steps：
Step 101：Scene three-dimensional modeling data is stored according to nuclear material and radiation source data builds computation of radiation field model.
Step 102：It is that flux turns dose mode by the calculating mode setting of the computation of radiation field model.
Step 103：Computational methods are set as the combination that detector method is combined with grid computing method.
Step 104：The Dose Rate of radiation field is calculated according to the calculating pattern and the computational methods.
Another embodiment of the present invention also provides a kind of computer storage media including computer executed instructions,
When the computer executed instructions are handled via data processing equipment, which executes large space deep penetration radiation field
The computational methods of Dose Rate.This approach includes the following steps：
Step 101：Scene three-dimensional modeling data is stored according to nuclear material and radiation source data builds computation of radiation field model.
Step 102：It is that flux turns dose mode by the calculating mode setting of the computation of radiation field model.
Step 103：Computational methods are set as the combination that detector method is combined with grid computing method.
Step 104：The Dose Rate of radiation field is calculated according to the calculating pattern and the computational methods.
Step 105：Read and show the Dose Rate of the radiation field.
Another embodiment of the present invention also provides a kind of computer storage media including computer executed instructions,
When the computer executed instructions are handled via data processing equipment, which executes large space deep penetration radiation field
The computational methods of Dose Rate.This approach includes the following steps：
Step 101：Scene three-dimensional modeling data is stored according to nuclear material and radiation source data builds computation of radiation field model.
Step 102：It is that flux turns dose mode by the calculating mode setting of the computation of radiation field model.
Step 103：Computational methods are set as the combination that detector method is combined with grid computing method.
Step 1041：The key point in radiation field is arranged in detector.
Step 1042：Mesh generation is carried out to the radiation field according to practical application scene and region-of-interest.
Step 1043：Using block subtract variance to the radiation field carry out space block.
Step 1044：Utilization index transformation, force collision combination method guiding PARTICLE TRANSPORT FROM direction.
Step 1045：Exploitation right window guides particle to counting unit Accelerating running, reduces and calculates variance.
Step 1046：Calculate the Dose Rate of the radiation field.
As shown in Fig. 4 A~Fig. 6 B, it is assumed that radioactive source is low concentration plutonium, pail pack is the sandwich solid wood of stainless steel and lead, medium
Be concrete for air, wall, door is stainless steel, room-sized is 10m × 9m × 3.5m.Spoke is calculated according to the above step that calculates
The Dose Rate exact value for penetrating field obtains the opposite global error that neutron, (n, γ) generation γ, low energy γ transport calculating
Relatively directly calculate (detector method) and reduce 80%, 40% and 100%, calculate quality factor be respectively increased 70 times, 9 times and
100 times, two-dimensional space distribution is promoted with obvious effects.
The specific embodiment of the invention provide a kind of large space deep penetration radiation field Dose Rate computational methods and
Medium, simultaneously calculates detector using variance-reduction technique and gridding method calculating carries out subtracting variance processing, realizes that radioactive source is three-dimensional
While galactic cosmic rays Dose Rate overall distribution rule is grasped, the essence of key point Dose Rate is obtained
True calculated value, and computational efficiency, computational accuracy are calculated far above directly simulation.
The above-mentioned embodiment of the present invention can be implemented in various hardware, Software Coding or both combination.For example, this hair
Bright embodiment, which is alternatively in data signal processor (Digital Signal Processor, DSP), executes the above method
Program code.The present invention can also refer to computer processor, digital signal processor, microprocessor or field-programmable gate array
Arrange the multiple functions that (Field Programmable Gate Array, FPGA) is executed.Above-mentioned processing can be configured according to the present invention
Device executes particular task, and machine-readable software code or the firmware generation of the ad hoc approach that the present invention discloses are defined by executing
Code is completed.Software code or firmware code can be developed into different program languages and different formats or form.Or
Different target platform composing software codes.However, configuring generation according to the software code of execution task of the present invention and other types
Different code pattern, type and the language of code do not depart from spirit and scope of the invention.
The foregoing is merely the schematical specific implementation modes of the present invention, before the design and principle for not departing from the present invention
It puts, the equivalent variations and modification that any those skilled in the art is made should all belong to the scope of protection of the invention.
Claims (10)
1. a kind of computational methods of large space deep penetration radiation field Dose Rate, which is characterized in that this method includes：
Scene three-dimensional modeling data is stored according to nuclear material and radiation source data builds computation of radiation field model；
It is that flux turns dose mode by the calculating mode setting of the computation of radiation field model；
Computational methods are set as the combination that detector method is combined with grid computing method；And
The Dose Rate of radiation field is calculated according to the calculating pattern and the computational methods.
2. the computational methods of large space deep penetration radiation field Dose Rate as described in claim 1, which is characterized in that
After the step of calculating the Dose Rate of radiation field according to the calculating pattern and the computational methods, this method is also wrapped
It includes：
Read and show the Dose Rate of the radiation field.
3. the computational methods of large space deep penetration radiation field Dose Rate as described in claim 1, which is characterized in that
The step of calculating the Dose Rate of radiation field according to the calculating pattern and the computational methods, specifically includes：
The key point in radiation field is arranged in detector；
Mesh generation is carried out to the radiation field according to practical application scene and region-of-interest；
Using block subtract variance to the radiation field carry out space block；
Utilization index transformation, force collision combination method guiding PARTICLE TRANSPORT FROM direction；
Exploitation right window guides particle to counting unit Accelerating running；And
Calculate the Dose Rate of the radiation field.
4. the computational methods of large space deep penetration radiation field Dose Rate as claimed in claim 3, which is characterized in that
The key point is calculated according to staff's motion frequency, the setting of shielding object and radioactive source distance.
5. the computational methods of large space deep penetration radiation field Dose Rate as claimed in claim 3, which is characterized in that
The fineness of the mesh generation is determined according to pre- space distribution rule of grasping.
6. the computational methods of large space deep penetration radiation field Dose Rate as claimed in claim 3, which is characterized in that
It the step of utilization index transformation, force collision combination method guiding PARTICLE TRANSPORT FROM direction, specifically includes：
Utilization index converter technique adjusts the microscopic cross of transporting particle in the medium；And
The collision frequency of count block particle is improved using force collision method.
7. the computational methods of large space deep penetration radiation field Dose Rate as claimed in claim 6, which is characterized in that
The adjustment formula of the microscopic cross is：
Wherein,For the microscopic cross after adjustment；For prototype micro section；P is draw direction；μ is particle direction and stretching side
The cosine of angle between.
8. the computational methods of large space deep penetration radiation field Dose Rate as claimed in claim 3, which is characterized in that
Exploitation right window guides the step of particle is to counting unit Accelerating running, specifically includes：
The energy section power window lower limit distribution file of the different grids of window generator joint acquisition is weighed by weighing window generator and energy；
And
The energy section power window lower limit distribution file is called to guide particle to counting unit Accelerating running.
9. the computational methods of large space deep penetration radiation field Dose Rate as described in claim 1, which is characterized in that
The grid computing method is that entire radiation field is divided into the population calculated after multiple cubes in each cube.
10. a kind of computer storage media including computer executed instructions, the computer executed instructions are via data processing
When equipment processing, which requires 1~9 any large space deep penetration radiation field air to absorb
The computational methods of dosage rate.
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