CN111650630A - Radioactive source arrangement method and system - Google Patents
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Abstract
The invention belongs to the technical field of radioactive sources, and discloses a radioactive source arrangement method and a radioactive source arrangement system, wherein the radioactive source arrangement system comprises: the parameter acquisition module and the radioactive source energy acquisition module are respectively used for acquiring radioactive source arrangement parameters and radioactive source energy; the radioactive source activity measuring module, the radiation rate determining module, the radiation amount calculating module, the to-be-radiated article absorbed dose calculating module and the total radiation amount calculating module are respectively used for determining the activity of a radioactive source, the radiation amount rate of the radioactive source at a reference point, the to-be-radiated article absorbed dose and the total radiation amount; the arrangement position calculation module and the evaluation module are respectively used for determining the arrangement position of the radioactive sources and evaluating the result; the arrangement module is used for arranging the radioactive sources; the invention can provide a plurality of radioactive source arrangement modes, and simultaneously carries out quantitative evaluation on each arrangement mode, thereby determining the optimal arrangement method and obtaining the radioactive source arrangement mode with the minimum reference surface dosage rate unevenness.
Description
Technical Field
The invention belongs to the technical field of radioactive sources, and particularly relates to a radioactive source arrangement method and a radioactive source arrangement system.
Background
At present, a radioactive source is a generic name of a radiation source made of a radioactive substance. The radioactive source is generally characterized by the activity of the radioactive nuclide, and the intensity of the radioactive nuclide can also be marked by the ray emissivity or the fluence rate. High activity or high emissivity sources for non-destructive inspection, radiation therapy, radiation treatment are conventionally referred to as radiation sources (radiationsources). The radiation application technology based on radioactive sources is widely applied in the fields of industry, agriculture, medicine, resources, environment, military, scientific research and the like.
However, the conventional radioactive source arrangement is mainly performed through manual experience, and particularly, when new and old sources are replaced, the radioactive source arrangement needs to be rearranged to ensure the uniformity of the radiation field, so that the time is long, the arrangement result is not necessarily the optimal result, and the efficiency is low.
Through the above analysis, the problems and defects of the prior art are as follows: the existing radioactive source arrangement method is long in time consumption, the arrangement result is not necessarily the optimal result, and meanwhile, the efficiency is low.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a radioactive source arrangement method and a radioactive source arrangement system.
The invention is realized in such a way that the radioactive source arrangement method comprises the following steps:
acquiring related radioactive source arrangement parameters by using a scanning device and a camera device, or inputting the related radioactive source arrangement parameters by using an input device; acquiring the energy of a radioactive source by using a scintillation detector;
measuring the activity of the radioactive source by using a radioactive source activity detector; determining an exposure rate constant of a certain determined radiation source based on the acquired or inputted radiation source type;
calculating the exposure dose rate of the radioactive source at the reference point based on the acquired or input shape, position, structure, spatial position of the reference point group and other related parameters of the radioactive source frame; calculating the absorption dose of the article to be radiated based on the acquired related parameters;
calculating the total irradiation amount based on the relevant irradiation type, the irradiation amount of the radioactive source at the reference point and the absorbed dose of the object to be irradiated; performing grouping and sequencing on the radioactive sources according to the sequence from small to large based on the radioactive source activity measurement result;
dividing a radiation field based on the radiation irradiation requirement, the shape of the radiation source frame, the structure of the radiation source frame, the parameters of a related radiation source and the absorbed dose of the object to be irradiated, and determining the required irradiation amount of each area; determining the arrangement position of the radioactive sources based on the required irradiation quantity of each area, the activity of the radioactive sources and the energy parameters;
evaluating the arrangement positions obtained by calculation by using a quantitative evaluation function; arranging the radioactive sources according to the position arrangement scheme with the optimal evaluation; and performing simulated display of the radioactive source arrangement based on various radioactive source arrangement parameters and the radioactive arrangement result.
Further, in step three, the calculating the dose rate of the radiation source at the reference point based on the acquired or inputted shape, position, structure, spatial position of the reference point group and other related parameters includes:
(1) when a single radioactive source is used:
making two straight lines on a vertical plane away from the central point of a single radioactive source to respectively represent the distribution of the radiation dose rate in two directions;
points are taken in the whole course of the two lines, and the irradiation dose rate of each point on the two lines is calculated.
The calculation formula of each point exposure dose rate is:
in the formula ：XPThe dose rate of a point on a straight line, in units of C.kg-1·s-1(ii) a A represents the activity of a single radioactive source, in Bq; representing the dose rate constant of the radiation source; l represents the length of the source in m; r represents the vertical distance of the calculated point on the straight line to the radioactive source in m; l denotes the height of the bottom of the source to the calculation point, in m.
(2) When a plurality of radioactive sources are used:
the method comprises the steps of calculating the irradiation dose rate of each radioactive source at a reference point based on a single radioactive source calculation method, and then summing the calculated irradiation dose rates of each radioactive source at the same reference point to obtain the irradiation dose rates of a plurality of radioactive sources at the reference point.
Further, in step three, the calculating the absorbed dose of the article to be irradiated based on the obtained related parameters includes:
firstly, determining the number of radioactive sources and the placement positions of the radioactive sources;
next, the absorbed dose of the article to be irradiated for each radiation source is calculated.
Further, step four, the calculation of the total irradiation amount based on the relevant irradiation type, the irradiation amount of the radiation source at the reference point and the absorbed dose of the article to be irradiated comprises:
1) judging the motion state of the object to be radiated in the irradiation field; the motion forms comprise static state, dynamic state or static and dynamic state; the static state is that the object to be irradiated is irradiated at a fixed position in the irradiation field; the dynamic state is that an object to be irradiated irradiates at a certain fixed speed in an irradiation field;
2) and (3) calculating the total irradiation amount according to different motion forms:
static total exposure calculation formula: the total irradiation amount is the irradiation dose rate of the object to be irradiated at a certain point;
the dynamic total exposure calculation formula is as follows: total exposure (exposure rate of the object to be irradiated at a certain point) (path traveled by the object to be irradiated/exposure time);
if the irradiation has both static and dynamic irradiation, the total irradiation value is the sum of the static total irradiation and the dynamic total irradiation.
Further, in step four, the performing the grouping and sorting of the radioactive sources according to the order from small to large based on the radioactive source activity measurement result includes:
when arranging, the radioactive sources in the same group are placed in the radioactive source placement positions in symmetrical positions.
Further, in step six, the quantitative evaluation function is:
s.t.
wherein ,
means for expressing the average absorbed dose for all reference points on the reference plane
Normalizing, normalizing the target function value P, α is a weighting coefficient representing the tendency of users to attach importance to D and P in the process of radioactive source arrangement, W, H is the width and height of a source frame, respectively, and the F function reflects the uniformity of the absorption dose rate distribution of any source arrangement scheme on a reference surface, and the smaller the function value is, the more uniform the absorption dose rate distribution is.
Another object of the present invention is to provide a radioactive source arraying system for implementing the radioactive source arraying method, including:
the parameter acquisition module is used for acquiring related radioactive source arrangement parameters by using the scanning device and the camera device, or inputting the related radioactive source arrangement parameters by using the input device, and transmitting data to the main control module for connection;
the radioactive source energy acquisition module is used for acquiring radioactive source energy by using a scintillation detector and transmitting data to the main control module for connection;
the radioactive source activity measuring module is used for measuring the activity of the radioactive source by using the radioactive source activity detector; and transmitting the data to the main control module for connection;
the irradiation rate determining module is used for determining an irradiation rate constant of the radioactive source based on the acquired or input radioactive source parameters and transmitting data to the main control module for connection;
the main control module is connected with the parameter acquisition module, the radioactive source energy acquisition module, the radioactive source activity measurement module, the exposure rate determination module, the exposure calculation module, the absorbed dose calculation module of an article to be irradiated, the total exposure calculation module, the radioactive source activity sequencing module, the radiation field dividing module, the arrangement position calculation module, the evaluation module, the arrangement module and the display module and is used for controlling each module to normally work;
the exposure calculation module is used for calculating the exposure rate of the radioactive source at the reference point based on the acquired or input shape, position, structure, spatial position of the reference point group and other related parameters of the radioactive source frame, and transmitting the data to the main control module for connection;
the radiation object absorbed dose calculation module is used for calculating the absorbed dose of the radiation object based on the acquired related parameters and transmitting the data to the main control module for connection;
the total exposure calculating module is used for calculating the total exposure based on the relevant irradiation type, the exposure of the radioactive source at the reference point and the absorbed dose of the object to be irradiated, and transmitting the data to the main control module for connection;
the radioactive source activity sequencing module is used for performing the grouped sequencing of radioactive sources according to the sequence from small to large based on the radioactive source activity measurement result and transmitting the data to the main control module for connection;
the radiation field dividing module is used for dividing the radiation field based on the radiation irradiation requirement, the shape of the radiation source frame, the structure of the radiation source frame, the parameters of a related radiation source and the absorbed dose of an article to be radiated, determining the required irradiation amount of each area and transmitting data to the main control module for connection;
the arrangement position calculation module is used for determining the arrangement position of the radioactive source based on the required irradiation amount of each area, the activity of the radioactive source and the energy parameter, and transmitting data to the main control module for connection;
the evaluation module is used for evaluating the arrangement positions obtained by calculation by utilizing a quantitative evaluation function and transmitting data to the main control module for connection;
the arrangement module is used for arranging the radioactive sources according to the position arrangement scheme with the optimal evaluation and transmitting data to the main control module for connection;
and the display module is used for performing simulated display of the radioactive source arrangement based on various radioactive source arrangement parameters and the radioactive arrangement result, and transmitting data to the main control module for connection.
Further, the radioactive source arrangement parameters include, but are not limited to, an article to be irradiated, a radiation irradiation requirement, a shape of the radioactive source rack, a structure of the radioactive source rack, a position of the radioactive source rack, a distance between the radioactive source rack and a reference plane, a spatial position and specification of a reference point group, the number of radioactive sources, a length of the radioactive source, the number of radioactive source mounting positions and corresponding mounting position coordinates, a kind of the radioactive source, and an irradiation type.
It is another object of the present invention to provide a computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface to implement the radiation source arrangement method when executed on an electronic device.
It is another object of the present invention to provide a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the radiation source arrangement method.
By combining all the technical schemes, the invention has the advantages and positive effects that: the invention obtains the related radioactive source arrangement parameters by the scanning device and the camera device through the parameter obtaining module, or inputs the related radioactive source arrangement parameters by the input device. The radioactive source energy acquisition module acquires the energy of a radioactive source by using a scintillation detector. The radioactive source activity measuring module measures the activity of the radioactive source by using the radioactive source activity detector. The fluence rate determination module determines a fluence rate constant for the radiation source based on the acquired or input radiation source parameters. The exposure calculation module calculates the exposure rate of the radioactive source at the reference point based on the acquired or input shape, position, structure, spatial position of the reference point group and other related parameters of the radioactive source frame. And the to-be-irradiated article absorbed dose calculation module calculates the absorbed dose of the to-be-irradiated article based on the acquired related parameters. And the total exposure calculation module calculates the total exposure based on the relevant irradiation type, the exposure of the radioactive source at the reference point and the absorbed dose of the object to be irradiated. And the radioactive source activity sequencing module performs the grouped sequencing of radioactive sources according to the sequence from small to large based on the radioactive source activity measurement result. The radiation field dividing module divides a radiation field based on the radiation irradiation requirement, the shape of the radiation source frame, the structure of the radiation source frame, the parameters of a related radiation source and the absorbed dose of an article to be irradiated, and determines the required irradiation dose of each area. The arrangement position calculation module determines the arrangement position of the radioactive source based on the required irradiation amount of each area, the activity of the radioactive source and the energy parameter. The evaluation module evaluates the calculated arrangement position by using a quantitative evaluation function. And the arrangement module is used for arranging the radioactive sources according to the position arrangement scheme which is optimal for evaluation. The invention can provide a plurality of radioactive source arrangement modes, and simultaneously carries out quantitative evaluation on each arrangement mode, thereby determining the optimal arrangement method and obtaining the radioactive source arrangement mode with the minimum reference surface dosage rate unevenness. The invention can greatly reduce the number of solution space states by placing the same group of radiation sources on the placing positions with symmetrical positions; the efficiency of radioactive source arrangement is improved, manpower and material resources are saved, and a comprehensive, accurate and effective radioactive source arrangement mode is obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an arrangement system of radioactive sources according to an embodiment of the present invention.
In the figure: 1. a parameter acquisition module; 2. a radioactive source energy acquisition module; 3. a radioactive source activity measuring module; 4. an exposure rate determination module; 5. a main control module; 6. an exposure amount calculation module; 7. an absorption dose calculation module for the article to be irradiated; 8. a total exposure calculation module; 9. a radioactive source activity sequencing module; 10. a radiation field dividing module; 11. an arrangement position calculation module; 12. an evaluation module; 13. an arrangement module; 14. and a display module.
FIG. 2 is a flowchart of a method for arranging radioactive sources according to an embodiment of the present invention.
Fig. 3 is a flowchart of a method for calculating the dose rate of a single radiation source according to an embodiment of the present invention.
Fig. 4 is a flowchart of a method for calculating an absorbed dose of an article to be irradiated according to an embodiment of the present invention.
Fig. 5 is a flowchart of a total exposure calculating method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to solve the problems in the prior art, the present invention provides a method and a system for arranging radioactive sources, which are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the alignment system of the radiation source provided by the embodiment of the present invention includes:
and the parameter acquisition module 1 is connected with the main control module 5 and is used for acquiring related radioactive source arrangement parameters by using a scanning device and a camera device or inputting the related radioactive source arrangement parameters by using an input device.
And the radioactive source energy acquisition module 2 is connected with the main control module 5 and is used for acquiring radioactive source energy by using the scintillation detector.
And the radioactive source activity measuring module 3 is connected with the main control module 5 and is used for measuring the activity of the radioactive source by using the radioactive source activity detecting instrument.
And the radiation rate determining module 4 is connected with the main control module 5 and is used for determining the radiation rate constant of the radiation source based on the acquired or input radiation source parameters.
The main control module 5 is connected with the parameter acquisition module 1, the radioactive source energy acquisition module 2, the radioactive source activity measurement module 3, the exposure rate determination module 4, the exposure calculation module 6, the absorbed dose calculation module 7 of the object to be irradiated, the total exposure calculation module 8, the radioactive source activity sequencing module 9, the radiation field division module 10, the arrangement position calculation module 11, the evaluation module 12, the arrangement module 13 and the display module 14, and is used for controlling the normal work of each module.
And the exposure calculating module 6 is connected with the main control module 5 and is used for calculating the exposure rate of the radioactive source at the reference point based on the acquired or input shape, position, structure, spatial position of the reference point group and other related parameters of the radioactive source frame.
And the radiation object absorbed dose calculation module 7 is connected with the main control module 5 and is used for calculating the absorbed dose of the radiation object based on the acquired related parameters.
And the total exposure calculating module 8 is connected with the main control module 5 and is used for calculating the total exposure based on the relevant irradiation type, the exposure of the radioactive source at the reference point and the absorbed dose of the object to be irradiated.
And the radioactive source activity sequencing module 9 is connected with the main control module 5 and is used for performing the grouped sequencing of radioactive sources according to the sequence from small to large based on the radioactive source activity measurement result.
And the radiation field dividing module 10 is connected with the main control module 5 and is used for dividing the radiation field based on the radiation irradiation requirement, the shape of the radiation source frame, the structure of the radiation source frame, the parameters of a related radiation source and the absorbed dose of an article to be radiated and determining the required irradiation dose of each area.
And the arrangement position calculation module 11 is connected with the main control module 5 and is used for determining the arrangement position of the radioactive source based on the required irradiation amount of each area, the activity of the radioactive source and the energy parameters.
And the evaluation module 12 is connected with the main control module 5 and is used for evaluating the arrangement positions obtained by calculation by using a quantitative evaluation function.
And the arrangement module 13 is connected with the main control module 5 and is used for arranging the radioactive sources according to the position arrangement scheme with the optimal evaluation.
And the display module 14 is connected with the main control module 5 and is used for performing simulation display of the radioactive source arrangement based on various radioactive source arrangement parameters and the radioactive arrangement result.
The radioactive source arrangement parameters provided by the embodiment of the invention include, but are not limited to, an article to be irradiated, a radiation irradiation requirement, a shape of a radioactive source frame, a structure of the radioactive source frame, a position of the radioactive source frame, a distance between the radioactive source frame and a reference surface, a spatial position and specification of a reference point group, the number of radioactive sources, the length of the radioactive sources, the number of radioactive source mounting positions and corresponding mounting position coordinates, the type of the radioactive sources and an irradiation type.
As shown in fig. 2, the radioactive source arrangement method provided by the embodiment of the present invention includes the following steps:
s101, acquiring related radioactive source arrangement parameters by using a scanning device and a camera device, or inputting the related radioactive source arrangement parameters by using an input device; and acquiring the energy of the radioactive source by using a scintillation detector.
S102, measuring the activity of the radioactive source by using a radioactive source activity detector; an exposure rate constant of a certain radiation source is determined based on the type of radiation source acquired or input.
S103, calculating the radiation dose rate of the radiation source at a reference point based on the acquired or input shape, position, structure, spatial position of the reference point group and other related parameters of the radiation source frame; and calculating the absorption dose of the article to be irradiated based on the acquired related parameters.
S104, calculating the total irradiation amount based on the relevant irradiation type, the irradiation amount of the radiation source at the reference point and the absorbed dose of the object to be irradiated; and carrying out the grouping and sequencing of the radioactive sources according to the sequence from small to large based on the activity measurement result of the radioactive sources.
S105, dividing a radiation field based on the radiation irradiation requirement, the shape of the radiation source frame, the structure of the radiation source frame, the related radiation source parameters and the absorbed dose of the object to be irradiated, and determining the required irradiation amount of each area; the arrangement position of the radioactive sources is determined based on the required irradiation amount of each area and the activity and energy parameters of the radioactive sources.
S106, evaluating the arrangement positions obtained by calculation by utilizing a quantitative evaluation function; arranging the radioactive sources according to the position arrangement scheme with the optimal evaluation; and performing simulated display of the radioactive source arrangement based on various radioactive source arrangement parameters and the radioactive arrangement result.
As shown in fig. 3, in step S103, the calculating an exposure dose rate of the radiation source at the reference point based on the acquired or inputted shape, position, structure, spatial position of the reference point group, and other related parameters of the radiation source frame according to the embodiment of the present invention includes:
(1) when a single radioactive source is used:
two straight lines are drawn on a vertical plane 0.4m away from the central point of a single radioactive source, and the two straight lines respectively represent the distribution of the radiation dose rate in two directions.
Points are taken in the whole course of the two lines, and the irradiation dose rate of each point on the two lines is calculated.
The calculation formula of each point exposure dose rate is:
in the formula ：XPThe dose rate of a point on a straight line, in units of C.kg-1·s-1(ii) a A represents the activity of a single radioactive source, in Bq; representing the dose rate constant of the radiation source; l represents the length of the source in m; r represents the vertical distance of the calculated point on the straight line to the radioactive source in m; l denotes the height of the bottom of the source to the calculation point, in m.
(2) When a plurality of radioactive sources are used:
the method comprises the steps of calculating the irradiation dose rate of each radiation source at a reference point based on a single radiation source calculation method, and then summing the calculated irradiation dose rates of each radiation source at the same reference point to obtain the irradiation dose rates of a plurality of radiation sources at the reference point.
As shown in fig. 4, in step S103, the calculating of the absorbed dose of the article to be irradiated based on the acquired relevant parameters according to the embodiment of the present invention includes:
s301, determining the number of the radioactive sources and the placement positions of the radioactive sources.
And S302, calculating the absorbed dose of the to-be-irradiated object to each radioactive source.
As shown in fig. 5, in step S104, the calculation of the total exposure dose based on the relevant exposure type, the exposure dose of the radiation source at the reference point, and the absorption dose of the article to be irradiated according to the embodiment of the present invention includes:
s401, judging the motion form of an object to be radiated in an irradiation field; the motion forms comprise static state, dynamic state or static and dynamic state; the static state is that the object to be irradiated is irradiated at a fixed position in the irradiation field; the dynamic state is that an object to be irradiated irradiates at a certain fixed speed in an irradiation field;
and S402, calculating the total irradiation amount according to different motion forms.
Static total exposure calculation formula: the total irradiation amount is the irradiation dose rate of the object to be irradiated at a certain point;
the dynamic total exposure calculation formula is as follows: total exposure is the exposure rate of the object to be irradiated at a certain point (distance traveled by the object to be irradiated/exposure time).
If the irradiation has both static and dynamic irradiation, the total irradiation value is the sum of the static total irradiation and the dynamic total irradiation.
In step S104, the performing of the radiation source grouping and sorting according to the order from small to large based on the radiation source activity measurement result provided by the embodiment of the present invention includes:
when arranging, the radioactive sources in the same group are placed in the radioactive source placement positions in symmetrical positions.
In step S106, the quantitative evaluation function provided in the embodiment of the present invention is:
s.t.
wherein ,
means for expressing the average absorbed dose for all reference points on the reference plane
Normalizing the function value P, α, weighting coefficient, W, H width and height of source frame, F function representing the uniformity of the absorbed dose rate distribution of any source arrangement scheme on the reference surface, and smaller function value representing the absorbentThe more uniform the dose rate distribution.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (9)
1. The radioactive source arrangement method is characterized by comprising the following steps:
acquiring related radioactive source arrangement parameters by using a scanning device and a camera device, or inputting the related radioactive source arrangement parameters by using an input device; acquiring the energy of a radioactive source by using a scintillation detector;
measuring the activity of the radioactive source by using a radioactive source activity detector; determining an exposure rate constant of a certain determined radiation source based on the acquired or inputted radiation source type;
calculating the exposure dose rate of the radioactive source at the reference point based on the acquired or input shape, position, structure, spatial position of the reference point group and other related parameters of the radioactive source frame; calculating the absorption dose of the article to be radiated based on the acquired related parameters;
calculating the total irradiation amount based on the relevant irradiation type, the irradiation amount of the radioactive source at the reference point and the absorbed dose of the object to be irradiated; performing grouping and sequencing on the radioactive sources according to the sequence from small to large based on the radioactive source activity measurement result;
dividing a radiation field based on the radiation irradiation requirement, the shape of the radiation source frame, the structure of the radiation source frame, the parameters of a related radiation source and the absorbed dose of the object to be irradiated, and determining the required irradiation amount of each area; determining the arrangement position of the radioactive sources based on the required irradiation quantity of each area, the activity of the radioactive sources and the energy parameters;
evaluating the arrangement positions obtained by calculation by using a quantitative evaluation function; arranging the radioactive sources according to the position arrangement scheme with the optimal evaluation; performing simulated display of the radioactive source arrangement based on various radioactive source arrangement parameters and the radioactive arrangement result;
in step three, the calculating the irradiation dose rate of the radiation source at the reference point based on the acquired or input shape, position, structure, spatial position of the reference point group and other related parameters comprises:
(1) when a single radioactive source is used:
making two straight lines on a vertical plane away from the central point of a single radioactive source to respectively represent the distribution of the radiation dose rate in two directions;
points are taken in the whole process of the two lines, and the irradiation dose rate of each point on the two lines is calculated;
the calculation formula of each point exposure dose rate is:
in the formula ：XPThe dose rate of a point on a straight line, in units of C.kg-1·s-1(ii) a A represents the activity of a single radioactive source, in Bq; representing the dose rate constant of the radiation source; l represents the length of the source in m; r represents the vertical distance of the calculated point on the straight line to the radioactive source in m; l represents the height from the bottom end of the radioactive source to the calculation point, and the unit is m;
(2) when a plurality of radioactive sources are used:
the method comprises the steps of calculating the irradiation dose rate of each radioactive source at a reference point based on a single radioactive source calculation method, and then summing the calculated irradiation dose rates of each radioactive source at the same reference point to obtain the irradiation dose rates of a plurality of radioactive sources at the reference point.
2. The method for arranging radioactive sources according to claim 1, wherein in step three, the calculating the absorbed dose of the article to be irradiated based on the acquired relevant parameters comprises:
firstly, determining the number of radioactive sources and the placement positions of the radioactive sources;
next, the absorbed dose of the article to be irradiated for each radiation source is calculated.
3. The method for arranging radioactive sources according to claim 1, wherein the calculating of the total exposure based on the relevant irradiation type, the exposure of the radioactive source at the reference point and the absorbed dose of the object to be irradiated comprises:
1) judging the motion state of the object to be radiated in the irradiation field; the motion forms comprise static state, dynamic state or static and dynamic state; the static state is that the object to be irradiated is irradiated at a fixed position in the irradiation field; the dynamic state is that an object to be irradiated irradiates at a certain fixed speed in an irradiation field;
2) and (3) calculating the total irradiation amount according to different motion forms:
static total exposure calculation formula: the total irradiation amount is the irradiation dose rate of the object to be irradiated at a certain point;
the dynamic total exposure calculation formula is as follows: total exposure (exposure rate of the object to be irradiated at a certain point) (path traveled by the object to be irradiated/exposure time);
if the irradiation has both static and dynamic irradiation, the total irradiation value is the sum of the static total irradiation and the dynamic total irradiation.
4. The method for arranging radioactive sources according to claim 1, wherein in step four, the step of sorting the radioactive sources into groups in descending order based on the activity measurement results of the radioactive sources comprises:
when arranging, the radioactive sources in the same group are placed in the radioactive source placement positions in symmetrical positions.
5. The method for arranging radioactive sources according to claim 1, wherein in step six, the quantitative evaluation function is:
s.t.
wherein ,
means for expressing the average absorbed dose for all reference points on the reference plane
Normalizing, normalizing the target function value P, α is a weighting coefficient representing the tendency of users to attach importance to D and P in the process of radioactive source arrangement, W, H is the width and height of a source frame, respectively, and the F function reflects the uniformity of the absorption dose rate distribution of any source arrangement scheme on a reference surface, and the smaller the function value is, the more uniform the absorption dose rate distribution is.
6. An arrangement system of radioactive sources for implementing the arrangement method of the radioactive sources according to any one of claims 1 to 5, wherein the arrangement system of the radioactive sources comprises:
the parameter acquisition module is used for acquiring related radioactive source arrangement parameters by using the scanning device and the camera device, or inputting the related radioactive source arrangement parameters by using the input device, and transmitting data to the main control module for connection;
the radioactive source energy acquisition module is used for acquiring radioactive source energy by using a scintillation detector and transmitting data to the main control module for connection;
the radioactive source activity measuring module is used for measuring the activity of the radioactive source by using the radioactive source activity detector; and transmitting the data to the main control module for connection;
the irradiation rate determining module is used for determining an irradiation rate constant of the radioactive source based on the acquired or input radioactive source parameters and transmitting data to the main control module for connection;
the main control module is connected with the parameter acquisition module, the radioactive source energy acquisition module, the radioactive source activity measurement module, the exposure rate determination module, the exposure calculation module, the absorbed dose calculation module of an article to be irradiated, the total exposure calculation module, the radioactive source activity sequencing module, the radiation field dividing module, the arrangement position calculation module, the evaluation module, the arrangement module and the display module and is used for controlling each module to normally work;
the exposure calculation module is used for calculating the exposure rate of the radioactive source at the reference point based on the acquired or input shape, position, structure, spatial position of the reference point group and other related parameters of the radioactive source frame, and transmitting the data to the main control module for connection;
the radiation object absorbed dose calculation module is used for calculating the absorbed dose of the radiation object based on the acquired related parameters and transmitting the data to the main control module for connection;
the total exposure calculating module is used for calculating the total exposure based on the relevant irradiation type, the exposure of the radioactive source at the reference point and the absorbed dose of the object to be irradiated, and transmitting the data to the main control module for connection;
the radioactive source activity sequencing module is used for performing the grouped sequencing of radioactive sources according to the sequence from small to large based on the radioactive source activity measurement result and transmitting the data to the main control module for connection;
the radiation field dividing module is used for dividing the radiation field based on the radiation irradiation requirement, the shape of the radiation source frame, the structure of the radiation source frame, the parameters of a related radiation source and the absorbed dose of an article to be radiated, determining the required irradiation amount of each area and transmitting data to the main control module for connection;
the arrangement position calculation module is used for determining the arrangement position of the radioactive source based on the required irradiation amount of each area, the activity of the radioactive source and the energy parameter, and transmitting data to the main control module for connection;
the evaluation module is used for evaluating the arrangement positions obtained by calculation by utilizing a quantitative evaluation function and transmitting data to the main control module for connection;
the arrangement module is used for arranging the radioactive sources according to the position arrangement scheme with the optimal evaluation and transmitting data to the main control module for connection;
and the display module is used for performing simulated display of the radioactive source arrangement based on various radioactive source arrangement parameters and the radioactive arrangement result, and transmitting data to the main control module for connection.
7. The radiation source arrangement system of claim 6 wherein the radiation source arrangement parameters include, but are not limited to, the item to be irradiated, the radiation exposure requirements, the shape of the radiation source holder, the structure of the radiation source holder, the position of the radiation source holder, the distance between the radiation source holder and the reference plane, the spatial position and specification of the reference point group, the number of radiation sources, the length of the radiation sources, the number of placement positions of the radiation sources and their corresponding placement position coordinates, the type of radiation sources, and the type of irradiation.
8. A computer program product stored on a computer readable medium, comprising a computer readable program for providing a user input interface for implementing the radiation source arrangement method of any one of claims 1-5 when executed on an electronic device.
9. A computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the radiation source arrangement method of any one of claims 1-5.
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