CN110287557A - A kind of Monte Carlo model method for building up for the estimation of sturgeon dosage rate - Google Patents
A kind of Monte Carlo model method for building up for the estimation of sturgeon dosage rate Download PDFInfo
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Abstract
The invention discloses a kind of Monte Carlo model method for building up for the estimation of sturgeon dosage rate comprising following steps: S1, to sturgeon anatomic measurement and weighing；S2, sturgeon each section approximate geometry body is described according to the sturgeon parameter measured in step S1；The Monte Carlo model foundation of S3, sturgeon dosage rate；S4, the estimation of sturgeon dosage rate；The verifying of S5, sturgeon model in terms of dosage rate estimation.This programme can establish by using the above-mentioned Monte Carlo model method for building up for the estimation of sturgeon dosage rate and provide model that is closer to the truth, can effectively distinguishing sturgeon histoorgan for the radiation effect evaluation of sturgeon, has the advantages that dividing tissue organ compared with ERICA model, and the biologic-organ divided is simple, data easily obtain, and have good promotion and application value.
Description
Technical field
The present invention relates to non-human species' radiation effect assessment technique fields, and in particular to one kind is estimated for sturgeon dosage rate
The Monte Carlo model method for building up of calculation.
Background technique
Attention with society to protection non-human species, ionising radiation on the possibility of non-human species influence also increasingly by
To the concern of people.International Atomic Energy Agency (IAEA), the courtyard radiation effect committee, the United Nations (UNSCEAR), international radiation
The protection committee (ICRP) successively delivers specialised publication discussion and describes this problem.It " is put publication in 2003 in China
The anti-therapy of radioactive pollution " and the requirement having in " the nuclear safety method " implemented to protection non-human species in 2018.
International non-human species' dose of radiation and radiation effect appraisal procedure and model have respectively: having Canadian
AECL approach, R&D128, D-Max of Britain, the LAKECOB of Holland, the ERICA of European Union, the U.S. RESRAD-
BIOTA, EDEN2, CATEAUR of France etc., the ERICA program for the European Union being most widely used at present and the RESRAD- in the U.S.
BIOTA program.
Biology is divided into fresh water, ocean and terrestrial life according to the difference of habitat in European Union's ERICA program.Every type
Belong under type according to the affiliated section of plant and the difference of growth phase is further divided, biology has been divided into 40 classes altogether.It is given birth to
Object model is represented with spheroid, and density, element composition, nucleic are uniformly distributed in sphere, and the size of organism can pass through change
Change the axial length of spheroid to change.Biology four classes are divided into according to habitat in U.S.'s RESRAD-BIOTA program: aquatic
Animal, four class of shore bank animal, terricole and land plant, biological model are divided according to body size, have been divided into 8 types
Type, biological figure also use spheroid to be represented.Furthermore 12 kinds defined in No. 108 reports that ICRP was published in 2008
With reference to biology, biological shape is all made of homogeneous ellipsoid representative.
It is represented with uniform spheroid and carries out dosage rate estimation with reference to biology, dividing tissue organ, does not have ignored not only ellipse
Difference between sphere and the practical figure of biology, and the density of sensitive organ, element are formed, Nuclear analysis and in vivo
The influence of dosage rate caused by the position of distribution does not consider yet, this will will lead to the uncertainty of organism dosage rate estimated value
And radiation effect is underestimated.
Summary of the invention
In view of the deficiencies in the prior art, it is estimated the purpose of the present invention is to provide a kind of with for sturgeon dosage rate
Monte Carlo model method for building up, which can establish the simplification anatomical model of sturgeon,
Radiation dose rate for sturgeon estimates, for sturgeon radiation effect evaluate provide it is closer to the truth and can be effective
The sturgeon model of dividing tissue organ.
To achieve the above object, The technical solution adopted by the invention is as follows:
It is a kind of for sturgeon dosage rate estimation Monte Carlo model method for building up, the Monte Carlo model method for building up its
Include the following steps；S1, to sturgeon anatomic measurement and weighing；S2, according to the sturgeon parameter measured in step S1 to sturgeon
Each section carries out geometric description；The Monte Carlo model foundation of S3, sturgeon dosage rate；S4, the estimation of sturgeon dosage rate；S5, sturgeon
Verifying of the model in terms of dosage rate estimation.
Further, in above-mentioned steps S1, the anatomic measurement of sturgeon and weighing are as follows: take out sturgeon, weigh to it, survey
Formal parameter is measured, and is dissected according to the position of differentiation, measures its each section formal parameter and quality respectively.
Further, in above-mentioned steps S2, according to resulting sturgeon parameter skeletonizing is measured, gained is marked in sketch
Sturgeon various pieces are represented using solid, determine that each position is related to curved surface by geometric parameter, provide surface equation with
And the correlation between each curved surface.
Further, in above-mentioned steps S3, according to the format of input file in the software MCNP of Monte Carlo, by each curved surface
And the curved surface constituent relation of each section is write such as MCNP input file, operation obtains the section of sturgeon model and different sections
Figure；Using identical method, the model of sturgeon local environment medium is established.
Further, according to the Monte Carlo sturgeon model for the sturgeon set up in above-mentioned steps S3, according to locating for biology
Irradiate medium in environment and particle energy, type, write source file, operation obtains the energy absorption point of different-energy particle
Number, acquired results are updated to dose rate conversion factor DCC calculation formula, calculate sturgeon inside and outside exposure dose rate conversion because
Son, calculation formula are as follows:
Internal dose rate conversion factor
External irradiation dose rate conversion factor
Wherein in formula:
The conversion coefficient of 5.76 × 10-4-J/h from MeV/s to μ；
ν --- emission types (α, β or γ)；
Ek--- the kth kind energy of ν particle radiation type, MeV；
Yk--- energy is E when radionuclide decays every timekν particle yield, 1；
Mi--- source tissue/organ i quality, kg；
Mj--- target tissue/organ j quality, kg；
φv,i,j(Ek) --- every transmitting primary energy is E in source tissue/organ ikν particle inhaled by target tissue/organ j
The energy absorption score of receipts；
Mm--- the quality of external source surrounding medium m, kg；
φv,m,j(Ek) --- every transmitting primary energy is E in external source surrounding medium mkν particle by target tissue/organ j
The energy absorption score of absorption；
According to the activity concentration in the activity concentration and water body of sturgeon each section of experiment acquisition, substitutes into dosage rate and calculate
Total average dose rate of sturgeon is calculated in formula, and dosage rate calculation formula is as follows:
Internal dose rate:
External irradiation dose rate:
Accumulated dose rate:
Wherein in formula:
WR,v--- radiation weighting factor, interior irradiation, α radiation take 10, and low energy β radiation takes 3, and non-low energy β and γ radiation take 1；
External exposure takes 1 to non-low energy β and γ radiation, does not consider α and low energy β；
Ci--- the activity concentration of nucleic A, Bq/kg fresh weight in source tissue/organ i；
Cm--- the activity concentration of nucleic A, Bq/kg or Bq/L in external environment medium m；
R --- occupancy factor of the biology in the surrounding medium.
Compared with prior art, the advantageous effects that this programme has are as follows: this programme is used for sturgeon by using above-mentioned
Dosage rate estimation Monte Carlo model method for building up can establish for sturgeon radiation effect evaluate provide be more nearly very
Truth condition, the model that can effectively distinguish sturgeon histoorgan, have the advantages that dividing tissue organ compared with ERICA model,
And the biologic-organ divided is simple, and data easily obtain, and have good promotion and application value.
Detailed description of the invention
Fig. 1 is the Monte Carlo model method for building up flow diagram of sturgeon dosage rate estimation in the present invention.
Fig. 2 is sturgeon model diagrammatic cross-section in the present invention.
Fig. 3 is sturgeon operation result contrast schematic diagram in the present invention.
Specific embodiment
The present invention is described in further detail with specific embodiment with reference to the accompanying drawings of the specification.
This programme is to carry out the estimation of dosage rate with reference to biology for existing represented with uniform spheroid, exist due to
Not dividing tissue organ, not only has ignored the difference between spheroid and the practical figure of biology, and to the density of sensitive organ,
Dosage rate influence caused by element composition, Nuclear analysis and the position that is distributed in vivo does not consider yet, this will will lead to
The uncertainty of organism dosage rate estimated value and to radiation effect the problem of underestimating, and then propose a kind of with using
In the Monte Carlo model method for building up of sturgeon dosage rate estimation, which can establish sturgeon
Simplify anatomical model, for sturgeon radiation dose rate estimate, for sturgeon radiation effect evaluation provide be more nearly really
Situation and the sturgeon model for capableing of effective dividing tissue organ.
Referring to figure 1, Monte Carlo model method for building up of the use for the estimation of sturgeon dosage rate in the present embodiment,
Itself the following steps are included:
S1, anatomic measurement and weighing are carried out to sturgeon
The sturgeon for taking out experiment, weighs to it, measure sturgeon formal parameter (entire length including sturgeon,
Maximum overall width etc.)；Then is dissected and (is dissected according to the major organs of sturgeon) according to the position of differentiation,
The formal parameter and quality of each section after measurement is dissected respectively；
S2, geometric description is carried out to each position
The sturgeon sketch after resulting sturgeon parameter draws dissection is measured according to above-mentioned steps S1, is marked in figure measured
Obtained each section organ geometric parameter；Various pieces are represented using solid, determines that each position is related to curved surface, gives
Correlation between surface equation and each curved surface out；
S3, Monte Carlo model are established
Referring to shown in attached drawing 2, according to the format of input file in the software MCNP of Monte Carlo, by the song of each organ of sturgeon
Face equation writes curved surface card according to call format, then establishes the relationship that each organ is related between curved surface by Boolean calculation, compiles
Lattice cell card is write, the density of each organ, element composition are programmed into data card.Then run input file, obtain sturgeon model with
And the sectional view of different directions.Using identical method, the model of sturgeon local environment medium is established.
S4, the estimation of sturgeon dosage rate
Simplify anatomical model using the Monte Carlo for the sturgeon set up in above-mentioned steps S3, according to locating for biology
Irradiate medium in environment and particle energy, type, write source file, operation obtains the energy absorption point of different-energy particle
Number, acquired results are updated to dose rate conversion factor DCC calculation formula, calculate sturgeon inside and outside exposure dose rate conversion because
Son, calculation formula are as follows:
Internal dose rate conversion factor
External irradiation dose rate conversion factor
Wherein, in formula:
5.76×10-4--- the conversion coefficient of J/h from MeV/s to μ；
ν --- it indicates emission types (α, β or γ)；
Ek--- the kth kind energy of ν particle radiation type, unit MeV；
Yk--- energy is E when radionuclide decays every timekν particle yield, 1；
Mi--- source tissue/organ i quality, unit kg；
Mj--- target tissue/organ j quality, unit kg；
--- every transmitting primary energy is E in source tissue/organ ikν particle absorbed by target tissue/organ j
Energy absorption score；
Mm--- the quality of external source surrounding medium m, unit kg；
--- every transmitting primary energy is E in external source surrounding medium mkν particle by target tissue/organ j
The energy absorption score of absorption.
According to the activity concentration in the activity concentration and water body of sturgeon each section of experiment acquisition, substitutes into dosage rate and calculate
Formula obtains total average dose rate of sturgeon, and dosage rate calculation formula is as follows:
Internal dose rate:
External irradiation dose rate:
Accumulated dose rate:
Wherein, in formula:
WR,v--- radiation weighting factor, interior irradiation, α radiation take 10, and low energy β radiation takes 3, and non-low energy β and γ radiation take 1；
External exposure takes 1 to non-low energy β and γ radiation, does not consider α and low energy β；
Ci--- the activity concentration of nucleic A, Bq/kg fresh weight in source tissue/organ i；
Cm--- the activity concentration of nucleic A, Bq/kg or Bq/L in external environment medium m；
R --- occupancy factor of the biology in the surrounding medium.
S5, dosage rate estimation result are compared with ERICA
The activity concentration of organism each section is weighted according to quality, organism mean activity concentration is obtained, will give birth to
Object activity concentration, geometric dimension input ERICA program, and operation obtains the dosage rate of organism each section.
Sturgeon dosage rate obtained above is compared with the result that ERICA method is run, model is tested
Card.
In conjunction with shown in reference attached drawing 3, by carrying out various test to the above-mentioned sturgeon Monte Carlo model in this programme
Card, result are as follows:
(1), the three-dimensional figure of contrast model and the actual shape of sturgeon, the two shape are coincide substantially；
(2), operation result compares: for β nucleic90For Sr, using simplified anatomical model and ERICA entirety mould is used
The resulting dosage rate difference of type is little, and for γ nucleic137For Cs, interior external exposure is variant, wherein interior irradiate ERICA
It is slightly lower, and external exposure EIRCA is much higher.This explanation has the tissue of different densities, element composition and nucleic Concentration Distribution
The distribution of organ in vivo will affect the energy deposition of the stronger particle of penetrability, the particle weaker for energy, difference
It is smaller.
In conclusion this programme can by using the above-mentioned Monte Carlo model method for building up estimated for sturgeon dosage rate
With set up for sturgeon radiation effect evaluation mould that is closer to the truth, can effectively distinguishing sturgeon histoorgan is provided
Type has the advantages that dividing tissue organ compared with ERICA model, and the biologic-organ divided is simple, and data easily obtain,
It has good promotion and application value.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technology
Within, then the present invention is also intended to include these modifications and variations.
Claims (5)
1. a kind of Monte Carlo model method for building up for the estimation of sturgeon dosage rate, it is characterised in that: the Monte Carlo model
Method for building up its include the following steps；
S1, to sturgeon anatomic measurement and weighing；
S2, sturgeon each section approximate geometry body is described according to the sturgeon parameter measured in step S1；
The Monte Carlo model foundation of S3, sturgeon dosage rate；
S4, the estimation of sturgeon dosage rate；
The verifying of S5, sturgeon model in terms of dosage rate estimation.
2. a kind of Monte Carlo model method for building up for the estimation of sturgeon dosage rate according to claim 1, feature
It is: in above-mentioned steps S1, the anatomic measurement of sturgeon and weighing are as follows: take out sturgeon, weigh to it, measure outer parameter
Number, and dissected according to the position of differentiation, its each section formal parameter and quality are measured respectively.
3. a kind of Monte Carlo model method for building up for the estimation of sturgeon dosage rate according to claim 1, feature
It is: in above-mentioned steps S2, according to resulting sturgeon parameter skeletonizing is measured, gained geometric parameter is marked in sketch,
Sturgeon various pieces are represented using approximate geometry body, determine that each position is related to curved surface, provide surface equation and each
Correlation between curved surface.
4. a kind of Monte Carlo model method for building up for the estimation of sturgeon dosage rate according to claim 3, feature
It is: in above-mentioned steps S3, according to the format of input file in the software MCNP of Monte Carlo, by the curved surface of each organ of sturgeon
Equation writes curved surface card according to call format, then establishes the relationship that each organ is related between curved surface by Boolean calculation, writes
The density of each organ, element composition are programmed into data card by lattice cell card；Then run input file, obtain sturgeon model and
The sectional view of different directions.Using identical method, the model of sturgeon local environment medium is established.
5. a kind of Monte Carlo model method for building up for the estimation of sturgeon dosage rate according to claim 4, feature
It is: according to the Monte Carlo model for the sturgeon set up in above-mentioned steps S3, medium in the irradiation environment according to locating for biology
And particle energy, type, write source file, operation obtains the energy absorption score of different-energy particle, by acquired results generation
Enter to dose rate conversion factor DCC calculation formula, calculates the inside and outside exposure dose rate conversion factor of sturgeon, calculation formula is such as
Under:
Internal dose rate conversion factor
External irradiation dose rate conversion factor
Wherein in formula:
The conversion coefficient of 5.76 × 10-4-J/h from MeV/s to μ；
ν --- emission types (α, β or γ)；
Ek--- the kth kind energy of ν particle radiation type, MeV；
Yk--- energy is E when radionuclide decays every timekν particle yield, 1；
Mi--- source tissue/organ i quality, kg；
Mj--- target tissue/organ j quality, kg；
φv,i,j(Ek) --- every transmitting primary energy is E in source tissue/organ ikThe energy that is absorbed by target tissue/organ j of ν particle
Measure absorption fraction；
Mm--- the quality of external source surrounding medium m, kg；
φv,m,j(Ek) --- every transmitting primary energy is E in external source surrounding medium mkν particle absorbed by target tissue/organ j
Energy absorption score；
According to the activity concentration in the activity concentration and water body of sturgeon each section of experiment acquisition, dosage rate calculation formula is substituted into
Total average dose rate of sturgeon is calculated, dosage rate calculation formula is as follows:
Internal dose rate:
External irradiation dose rate:
Accumulated dose rate:
Wherein in formula:
WR,v--- radiation weighting factor, interior irradiation, α radiation take 10, and low energy β radiation takes 3, and non-low energy β and γ radiation take 1；Outer photograph
It penetrates and 1 is taken to non-low energy β and γ radiation, do not consider α and low energy β；
Ci--- the activity concentration of nucleic A, Bq/kg fresh weight in source tissue/organ i；
Cm--- the activity concentration of nucleic A, Bq/kg or Bq/L in external environment medium m；
R --- occupancy factor of the biology in the surrounding medium.
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Citations (3)
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| CN104267125A (en) * | 2014-10-13 | 2015-01-07 | 中国水产科学研究院长江水产研究所 | Method for predicting drug residues in grass carp tissue with physiological pharmacokinetic model |
| CN107391898A (en) * | 2016-05-16 | 2017-11-24 | 中国辐射防护研究院 | The computational methods of aquatile dose conversion factor |
| CN109523586A (en) * | 2018-12-03 | 2019-03-26 | 中国辐射防护研究院 | A kind of dosage rate evaluation method and system based on Monte Carlo voxel model |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267125A (en) * | 2014-10-13 | 2015-01-07 | 中国水产科学研究院长江水产研究所 | Method for predicting drug residues in grass carp tissue with physiological pharmacokinetic model |
| CN107391898A (en) * | 2016-05-16 | 2017-11-24 | 中国辐射防护研究院 | The computational methods of aquatile dose conversion factor |
| CN109523586A (en) * | 2018-12-03 | 2019-03-26 | 中国辐射防护研究院 | A kind of dosage rate evaluation method and system based on Monte Carlo voxel model |
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