CN109738929B - Dose estimation method and system based on maximum consumption of resident food - Google Patents
Dose estimation method and system based on maximum consumption of resident food Download PDFInfo
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Abstract
The invention discloses a dose estimation method and a system based on the maximum consumption of resident food, wherein the method comprises the following steps: s1, carrying out a recipe survey on residents in a preset radius range of the nuclear power station, surveying to obtain weekly consumption of the residents on various foods, and calculating to obtain annual consumption of the residents on the various foods; s2, after the annual consumption of the individual food is sorted in an ascending order, the annual consumption of the individual food corresponding to the 90% percentile of the sorted order is taken, and the annual consumption of the individual food is redistributed according to the share of the average consumption of each food, so that the annual maximum consumption of each food is obtained; and S3, substituting the annual maximum consumption of each food into an internal irradiation dose calculation formula to calculate the internal irradiation dose of residents, and calculating the total dose of the nuclear power station to the residents according to the internal irradiation dose. According to the method and the system provided by the invention, the maximum consumption of the resident food according with the actual situation is obtained through statistical calculation by adopting a percentile method, so that the calculated resident dosage is more accurate.
Description
Technical Field
The invention relates to the field of dose estimation, in particular to a dose estimation method and system based on the maximum consumption of resident food.
Background
During operation of nuclear facilities, radionuclides may be released into the environment in the form of particles or gases, settle on the surfaces of crops, plants, etc., and the route of ingestion is a major component of the dose for residents.
Radioactive effluents released into the atmosphere by gaseous pathways cause radiation exposure to the public during atmospheric diffusion, the following exposure pathways being considered in the estimation of the radiation dose to the surrounding public: (1) External irradiation by immersion in a radioactive contaminated atmosphere; (2) External irradiation caused by radioactive substances deposited on the ground; (3) The internal irradiation caused by eating radioactive contaminated grains, vegetables, fruits and the like; (4) Internal irradiation caused by feeding radioactive contaminated feed to meat, milk, etc. of livestock; (5) internal irradiation by inhalation of radioactively contaminated air. It can be seen that the maximum consumption of food by residents has an important influence on calculation of radiation dose of key resident groups, and is one of important links of atmospheric diffusion consequence evaluation.
The International radioprotection Commission No. 101 publication "assembling Dose of The regenerative Person for The reproduction of Radiation Protection of The Public and The optimization of The radiologic Protection: broadcasting the Process "explicitly suggests that in selecting life habit data for a representative individual, care needs to be taken: (a) Rationality, not only can be realistically applied to one person, but also cannot exceed the range of possible data in daily life; (b) Persistence, i.e., selected life habit data, can continue to be available for the duration of the assessment. The ICRP101 publication suggests that caution should be used with a 95% percentile of food consumption to avoid undue conservative calculations.
The publication "general happy place data for radiologic associations" published by the british national radiation protection commission in 2003, and during the recipe survey, the food was divided into 26 groups, and the residents were divided into four age groups: 6-12 months, 10-11 years old, 14-15 years old, 16-64 years old. Maximum food consumption by the residents: take 95% percentile of the consumed amount of each food. The calculation method is not reasonable, so that the total amount of the maximum food consumption is larger, the actual consumption data of residents are separated, and the dosage estimation is larger.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method and a system for estimating the dosage based on the maximum consumption of resident food.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a dose estimation method based on the maximum consumption of resident food, comprising:
s1, carrying out recipe survey on residents in a preset radius range of a nuclear power station, obtaining weekly consumption of the residents on various foods through survey, and calculating annual consumption of the residents on the various foods according to the weekly consumption;
s2, sorting the annual food consumption of the individual food in an ascending order, performing statistical calculation through percentiles, taking the annual food consumption of the individual food corresponding to 90% of the sorted percentiles, and redistributing the annual food consumption of the individual food according to the average consumption share of each food to obtain the annual maximum consumption of each food; or
After the annual consumption of each food is sorted in an ascending order, the annual consumption of each food is calculated through percentiles, the annual consumption of each food corresponding to 90% percentiles of the order is taken, and the annual maximum consumption of each food is determined by combining the survey result of the eating frequency of each food;
and S3, substituting the annual maximum consumption of each food into an internal irradiation dose calculation formula, calculating to obtain the internal irradiation dose caused by the fact that the residents eat various foods polluted by radioactivity, and calculating to obtain the total dose of the nuclear power station to the residents according to the internal irradiation dose.
Further, in the above method for estimating a dosage based on the maximum consumption of food by a resident, the step S1 further comprises: and dividing the residents according to the age range to obtain a plurality of age groups.
Further, according to the method for calculating the maximum food consumption of residents near the nuclear power plant, the calculation formula of the internal radiation dose is as follows:
wherein,
the internal irradiation dose is the internal irradiation dose for eating and accumulation of individuals of the age group a in a sector area below the wind direction i, and the unit is Sv/a;
the annual maximum consumption of p-type food by individuals in the age group a in units of kg/a or 1/a; g Fa Is the intake dose conversion factor of the age group a, and has the unit Sv/Bq; f. of p The portion of p-type food consumed;
the unit is Bq/kg or Bq/1 for the radionuclide concentration in p-type food.
Further, a method of dose estimation based on the maximum consumption of resident foods as described above, the various foods including: food crops, vegetables, meats, aquatic products, milks and products thereof, eggs and fruits 7 groups, the vegetables include: leaves, rhizomes, fruits and aquatic species; the meat comprises: pork, mutton, beef and poultry; the aquatic product comprises: fish, crustaceans, molluscs, and algae.
A dose estimation system based on a resident food maximum consumption amount, comprising:
the survey module is used for conducting a recipe survey on residents in a preset radius range of the nuclear power station, surveying the weekly consumption of the residents on various foods, and calculating the annual consumption of the residents on the various foods according to the weekly consumption;
the determining module is used for performing statistical calculation through percentiles after the personal food annual consumption is sorted in an ascending order, taking the personal food annual consumption corresponding to the 90% percentile of the sort, and redistributing the personal food annual consumption according to the share of the average consumption of each food to obtain the annual maximum consumption of each food; or
After the annual consumption of each food is sorted in an ascending order, statistical calculation is carried out through percentiles, the annual consumption of each food corresponding to 90% percentiles in the order is taken, and the annual maximum consumption of each food is determined by combining the survey result of the eating frequency of each food;
and the calculation module is used for substituting the annual maximum consumption of each kind of food into an internal irradiation dose calculation formula, calculating to obtain the internal irradiation dose caused by that the residents eat various kinds of food polluted by radioactivity, and calculating to obtain the total dose of the nuclear power station to the residents according to the internal irradiation dose.
Further, the system for estimating dosage based on maximum consumption of food by residents as described above, wherein the investigation module is further configured to: and dividing the residents according to the age range to obtain a plurality of age groups.
Further, in the above dose estimation system based on the maximum consumption of food by the residents, the calculation formula of the internal irradiation dose is:
wherein,
the internal irradiation dose is the internal irradiation dose for eating and accumulation of individuals of the age group a in a sector area below the wind direction i, and the unit is Sv/a;
the annual maximum consumption of p-type foods by individuals in the age group a in units of kg/a or 1/a; g Fa Is the intake dose conversion factor of the age group a, and has the unit Sv/Bq; f. of p Is the portion of the p-type food consumed;
the unit is Bq/kg or Bq/1 for the radionuclide concentration in p-type food.
Further, a dose estimation system based on the maximum consumption of resident foods as described above, said various foods including: food crops, vegetables, meats, aquatic products, milks and products thereof, eggs and fruits 7 groups, the vegetables include: leaves, rhizomes, fruits and aquatic species; the meat comprises: pork, mutton, beef and poultry; the aquatic product comprises: fish, crustaceans, molluscs, and algae.
The invention has the beneficial effects that: according to the method and the system provided by the invention, survey data are collected, the reasonable maximum consumption of the resident food which accords with the actual situation is obtained by adopting a percentile method to carry out statistical calculation, the calculated resident dosage is more accurate, the environmental evaluation accuracy of the nuclear power plant is improved, and the potential social benefit and the economic benefit are realized.
Drawings
FIG. 1 is a schematic flow chart of a method for estimating dosage based on maximum consumption of food by residents according to an embodiment of the present invention;
FIG. 2 is a flow chart of a first method for calculating the maximum consumption of food by a resident provided in the embodiment of the present invention;
FIG. 3 is a flowchart of a second method for calculating the maximum consumption of food by the residents according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of a dosage estimation system based on the maximum consumption of resident food according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in fig. 1, a dose estimation method based on the maximum consumption of resident food, comprising:
s1, carrying out recipe survey on residents in a preset radius range of the nuclear power station, obtaining weekly consumption of the residents on various foods through the survey, and calculating annual consumption of the residents on the various foods according to the weekly consumption;
s2, sorting the annual food consumption of the individual food in an ascending order, performing statistical calculation through percentiles, taking the annual food consumption of the individual food corresponding to 90% of the sorted percentiles, and redistributing the annual food consumption of the individual food according to the average consumption share of each food to obtain the annual maximum consumption of each food; or
After the annual consumption of each food is sorted in an ascending order, carrying out statistical calculation through percentiles, taking the annual consumption of each food corresponding to 90% of the sorted percentiles, and determining the annual maximum consumption of each food by combining the survey result of the eating frequency of each food;
and S3, substituting the annual maximum consumption of each food into an internal irradiation dose calculation formula, calculating to obtain the internal irradiation dose caused by that residents eat various foods polluted by radioactivity, and calculating to obtain the total dose of the nuclear power station to the residents according to the internal irradiation dose.
The step S1 further includes: and dividing residents according to the age range to obtain a plurality of age groups.
The calculation formula of the internal irradiation dose is as follows:
wherein,
the internal irradiation dose is the internal irradiation dose for eating and accumulation of individuals of the age group a in a sector area below the wind direction i, and the unit is Sv/a;
for individuals of age group aAnnual maximum consumption of p-type foods in kg/a or 1/a; g Fa Is the intake dose conversion factor of the age group a, and has the unit Sv/Bq; f. of p Is the portion of the p-type food consumed;
the unit is Bq/kg or Bq/1 for the radionuclide concentration in p-type food.
Various foods include: 7 groups of grain crops, vegetables, meat, aquatic products, milk and products thereof, eggs and fruits, wherein the vegetables comprise: leaves, rhizomes, fruits and aquatic species; the meat comprises: pork, mutton, beef and poultry; the aquatic product comprises: fish, crustaceans, molluscs, and algae.
Example one
And (4) carrying out resident recipe survey on a certain nuclear power plant within the radius of 5km, and issuing a recipe questionnaire. The food consumption varieties are divided into 7 groups of grain crops, vegetables, meat, aquatic products, milk and products thereof, eggs and fruits. Wherein the vegetables include leaves, roots, fruits and aquatic plants; meat consumption including pork, mutton, beef and poultry; aquatic product consumption includes fish, crustaceans, molluscs, and algae. The annual consumption amount is calculated by investigating the weight of various foods eaten by residents in a week.
The resident ages are divided into three groups of children (0-7 years old), adolescents (7-17 years old) and adults (more than 17 years old) according to different age groups.
And collecting survey data, and performing statistical calculation by using percentiles. The percentile is a numerical value at a certain percentile in a set of data arranged in a certain order, and is denoted by Pr. A percentile Pr divides the overall observations of the population or sample into two parts, theoretically r% of which are smaller and (100-r%) of which are larger.
The key point of the invention is that the reasonable maximum food consumption of residents which accords with the actual situation is obtained by calculation, and then more accurate total dosage is obtained by calculation. The invention provides two statistical methods.
(1) In the qualified questionnaire, after 7 groups of foods of the personal foods are sorted in an ascending order, the percentile is adopted for statistical calculation, the personal total food consumption corresponding to the 90% percentile is taken, and each food is distributed according to the average food consumption, so that the annual maximum consumption of the personal food of each food is obtained. As shown in fig. 2.
(2) After the consumption of each food of 7 groups of foods is sorted in an ascending order, the percentile is adopted for statistical calculation, and the annual maximum consumption of the personal food is obtained by taking the consumption of each food corresponding to 90 percent of the sorted percentile. And then, according to the survey of eating frequency of different foods, a questionnaire shows a table I, and the value of food which is eaten at least 1 time or 4-6 times per week every day is obtained according to the annual maximum consumption of personal food, and the value of other food types is obtained according to the average food consumption. As shown in fig. 3.
TABLE A survey of the frequency of consumption of different foods by residents in a range of 5km in radius of a nuclear power plant (2016)
According to the first method, the maximum annual consumption of food of residents of different age groups in 2018 in the range of radius 5km of a certain nuclear power plant is counted, and the maximum annual consumption is shown in the table II.
The present invention is superior to the 95% percentile of each food consumption recommended by the british national radiation protection committee (NRPB). But instead a percentile of 90% of the total food consumption is selected, or the maximum food consumption of several foods is selected according to the actual eating frequency.
The method is closer to the actual consumption condition of residents and more reasonable, the calculated resident dosage is more accurate, the environment evaluation accuracy of the nuclear power plant is improved, and the method has potential social benefits and economic benefits.
As shown in fig. 4, a dose estimation system based on the maximum consumption of resident food, comprising:
the survey module 1 is used for conducting a recipe survey on residents in a preset radius range of the nuclear power station, surveying the weekly consumption of the residents on various foods, and calculating the annual consumption of the residents on the various foods according to the weekly consumption;
the determining module 2 is used for performing statistical calculation through percentiles after the food annual consumption of individuals is sorted in an ascending order, taking the food annual consumption of the individual corresponding to the 90% percentile of the sorting, and redistributing the food annual consumption of the individual according to the share of the average consumption of each food to obtain the annual maximum consumption of each food; or
After the annual consumption of each food is sorted in an ascending order, carrying out statistical calculation through percentiles, taking the annual consumption of each food corresponding to 90% of the sorted percentiles, and determining the annual maximum consumption of each food by combining the survey result of the eating frequency of each food;
and the calculating module 3 is used for substituting the annual maximum consumption of each food into an internal irradiation dose calculation formula, calculating to obtain the internal irradiation dose caused by that residents eat various foods polluted by radioactivity, and calculating to obtain the total dose of the nuclear power station to the residents according to the internal irradiation dose.
The investigation module 1 is further configured to: and dividing residents according to the age range to obtain a plurality of age groups.
The calculation formula of the internal irradiation dose is as follows:
wherein,
the internal irradiation dose is the internal irradiation dose for eating and waiting for food of a age group individuals in a sector area below the wind direction, and the unit is Sv/a;
the annual maximum consumption of p-type food by individuals in the age group a in units of kg/a or 1/a; g Fa An edible preparation for the age group of aA quantitative conversion factor, in units Sv/Bq; f. of p Is the portion of the p-type food consumed;
the unit is Bq/kg or Bq/1 for the radionuclide concentration in p-type food.
Various foods include: 7 groups of grain crops, vegetables, meat, aquatic products, milk and products thereof, eggs and fruits, wherein the vegetables comprise: leaves, rhizomes, fruits and aquatic species; the meat comprises: pork, mutton, beef and poultry; the aquatic product comprises: fish, crustaceans, molluscs, and algae.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
Claims (6)
1. A dose estimation method based on the maximum consumption of resident food, comprising:
s1, conducting a recipe survey on residents in a preset radius range of a nuclear power station, surveying to obtain weekly consumption of the residents on various foods, and calculating according to the weekly consumption to obtain annual consumption of the residents on the various foods;
s2, sorting the annual food consumption of the individual food in an ascending order, performing statistical calculation through percentiles, taking the annual food consumption of the individual food corresponding to 90% of the sorted percentiles, and redistributing the annual food consumption of the individual food according to the average consumption share of each food to obtain the annual maximum consumption of each food; or
After the annual consumption of each food is sorted in an ascending order, carrying out statistical calculation through percentiles, taking the annual consumption of each food corresponding to 90% of the sorted percentiles, and determining the annual maximum consumption of each food by combining the survey result of the eating frequency of each food;
s3, substituting the annual maximum consumption of each food into an internal irradiation dose calculation formula, calculating to obtain the internal irradiation dose caused by the fact that the residents eat various foods polluted by radioactivity, and calculating to obtain the total dose of the nuclear power station to the residents according to the internal irradiation dose;
the calculation formula of the internal irradiation dose is as follows:
wherein,
the internal irradiation dose is the internal irradiation dose for eating and accumulation of individuals of the age group a in a sector area below the wind direction i, and the unit is Sv/a;
the annual maximum consumption of p-type foods by individuals in the age group a in units of kg/a or 1/a; g Fa Is the intake dose conversion factor of the age group a, and has the unit Sv/Bq; f. of p The portion of p-type food consumed;
the unit is Bq/kg or Bq/1 for the radionuclide concentration in p-type food.
2. The resident food maximum consumption based dose estimation method according to claim 1, wherein the step S1 further comprises: and dividing the residents according to the age range to obtain a plurality of age groups.
3. A dose estimation method based on the maximum consumption of resident food according to any one of claims 1-2, characterized in that said various foods include: 7 groups of food crops, vegetables, meat, aquatic products, milk and products thereof, eggs and fruits, the vegetables comprising: leaves, rhizomes, fruits and aquatic species; the meat comprises: pork, mutton, beef and poultry; the aquatic product comprises: fish, crustaceans, molluscs, and algae.
4. A dose estimation system based on a maximum consumption of resident food, comprising:
the system comprises a survey module, a data processing module and a data processing module, wherein the survey module is used for carrying out recipe survey on residents in a preset radius range of the nuclear power station, obtaining weekly consumption of the residents for various foods through survey, and calculating annual consumption of the residents for the various foods according to the weekly consumption;
the determining module is used for performing statistical calculation through percentiles after the food annual consumption of individuals is sorted in an ascending order, taking the food annual consumption of the individual corresponding to the 90% percentile of the sorting order, and redistributing the food annual consumption of the individual according to the share of the average consumption of each food to obtain the annual maximum consumption of each food; or
After the annual consumption of each food is sorted in an ascending order, carrying out statistical calculation through percentiles, taking the annual consumption of each food corresponding to 90% of the sorted percentiles, and determining the annual maximum consumption of each food by combining the survey result of the eating frequency of each food;
the calculation module is used for substituting the annual maximum consumption of each kind of food into an internal irradiation dose calculation formula, calculating to obtain the internal irradiation dose caused by that the residents eat various kinds of food polluted by radioactivity, and calculating to obtain the total dose of the nuclear power station to the residents according to the internal irradiation dose;
the calculation formula of the internal irradiation dose is as follows:
wherein,
the internal irradiation dose is the internal irradiation dose for eating and accumulation of individuals of the age group a in a sector area below the wind direction i, and the unit is Sv/a;
the annual maximum consumption of p-type foods by individuals in the age group a in units of kg/a or 1/a; g Fa Is the intake dose conversion factor of the age group a, and has the unit Sv/Bq; f. of p The portion of p-type food consumed;
the unit is Bq/kg or Bq/1 for the radionuclide concentration in p-type food.
5. The resident food maximum consumption based dose estimation system according to claim 4, wherein the investigation module is further configured to: and dividing the residents according to the age range to obtain a plurality of age groups.
6. A resident food maximum consumption based dose estimation system according to any of claims 4-5, characterized in that the foods include: food crops, vegetables, meats, aquatic products, milks and products thereof, eggs and fruits 7 groups, the vegetables include: leaves, rhizomes, fruits and aquatic species; the meat comprises: pork, mutton, beef and poultry; the aquatic product comprises: fish, crustaceans, molluscs, and algae.
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