CN113566970B - Searching method and device for Pu-238 isotope heat source - Google Patents
Searching method and device for Pu-238 isotope heat source Download PDFInfo
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- CN113566970B CN113566970B CN202110693182.5A CN202110693182A CN113566970B CN 113566970 B CN113566970 B CN 113566970B CN 202110693182 A CN202110693182 A CN 202110693182A CN 113566970 B CN113566970 B CN 113566970B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000005855 radiation Effects 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000001931 thermography Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 239000000443 aerosol Substances 0.000 claims description 10
- 238000011109 contamination Methods 0.000 claims description 7
- 238000003915 air pollution Methods 0.000 claims description 6
- 230000002285 radioactive effect Effects 0.000 description 20
- 238000012544 monitoring process Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 3
- 210000003928 nasal cavity Anatomy 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 238000003904 radioactive pollution Methods 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0066—Radiation pyrometry, e.g. infrared or optical thermometry for hot spots detection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/02—Dosimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/167—Measuring radioactive content of objects, e.g. contamination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a searching method and a searching device for a Pu-238 isotope heat source, wherein the method comprises the following steps: determining the preliminary position of the Pu-238 isotope heat source based on the heating characteristics of the Pu-238 isotope heat source and the remote temperature distribution condition in the accident area; determining an optimal search line based on the preliminary location, neutrons and gamma radiation field levels within the accident area; determining the accurate position of the Pu-238 isotope heat source based on the optimal search line, the heating characteristic of the Pu-238 isotope heat source and the close-range temperature distribution condition in the accident area by combining the neutron and gamma radiation field levels in the accident area; measuring the surface and surrounding pollution levels of the Pu-238 isotope heat source based on the accurate position; based on the pollution level and the background level of the Pu-238 isotope heat source when the inclusion is complete, the current situation of the Pu-238 isotope heat source is analyzed. The invention combines infrared thermal imaging, neutron, gamma and pollution measurement to realize accurate positioning of the heat source and judge whether the containment is damaged.
Description
Technical Field
The invention relates to the field of nuclear emergency radiation protection, in particular to a searching method and device for a Pu-238 isotope heat source.
Background
The nuclear-involved spacecraft for carrying out the deep space exploration task uses Pu-238 isotope heat sources, and when the nuclear-involved spacecraft cannot take off or fly normally according to a preset program, explosion and impact can occur, so that the Pu-238 heat sources are scattered and contained to be damaged, and under the extreme accident condition, even radioactive substances are not discharged into the environment, different degrees of pollution are caused to an accident area, and emergency response personnel and the public can be subjected to radioactive pollution or irradiation, so that an emergency disposal flow and a searching method aiming at the Pu-238 isotope heat sources need to be formulated.
Pu-238 heat source is an alpha emitter with low level gamma radioactivity, the main energy of gamma rays is 11.6 keV-21.7 keV, the distance is severely limited by the traditional neutron and gamma measuring instrument due to spontaneous fission and (alpha, n) reaction with lower level neutron rays, and the method is not suitable for heat source searching in large-area accident areas. Therefore, a method for searching a heat source suitable for a large-area accident area is needed to solve the above-mentioned limitation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a searching method and device for a Pu-238 isotope heat source, which are combined with infrared thermal imaging, neutron, gamma and pollution measurement to realize accurate positioning of the heat source.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a searching method of Pu-238 isotope heat source comprises the following steps:
determining a preliminary position of the Pu-238 isotope heat source based on heating characteristics of the Pu-238 isotope heat source and remote temperature distribution conditions in an accident area;
determining an optimal search line based on the preliminary location, neutrons and gamma radiation field levels within the accident area;
determining the accurate position of the Pu-238 isotope heat source based on the optimal search line, the heating characteristics of the Pu-238 isotope heat source and the close-range temperature distribution condition in the accident area by combining neutron and gamma radiation field levels in the accident area;
measuring the surface and surrounding contamination levels of the Pu-238 isotope heat source based on the accurate location;
and analyzing the current situation of the Pu-238 isotope heat source based on the pollution level and the background level when the Pu-238 isotope heat source is well contained.
Further, the searching method as described above, the step of determining the preliminary position of the Pu-238 isotope heat source based on the heating characteristics of the Pu-238 isotope heat source and the remote temperature distribution in the accident area, includes:
and remotely measuring the remote temperature distribution condition in the accident area by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the preliminary position of the Pu-238 isotope heat source.
Further, according to the searching method described above, the step of determining the accurate position of the Pu-238 isotope heat source based on the optimal searching route, the heating characteristics of the Pu-238 isotope heat source and the close-range temperature distribution in the accident area, in combination with neutron and gamma radiation field levels in the accident area, includes:
and measuring the close-range temperature distribution condition in the accident area in a close range by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the accurate position of the Pu-238 isotope heat source by combining the neutron and gamma radiation field level in the accident area.
Further, the searching method as described above, the step of measuring the contamination level of the surface and the surroundings of the Pu-238 isotope heat source based on the accurate position, includes:
and measuring the surface pollution level of the Pu-238 isotope heat source by a surface pollution measuring instrument based on the accurate position, and measuring the air pollution level of the Pu-238 isotope heat source by an aerosol continuous monitor.
Further, the searching method as described above, the step of analyzing the current situation of the Pu-238 isotope heat source based on the pollution level and the background level when the Pu-238 isotope heat source is well contained, comprises:
and comparing the pollution level with the background level of the Pu-238 isotope heat source when the Pu-238 isotope heat source is well contained, analyzing whether the Pu-238 isotope heat source is scattered or damaged, and evaluating the damage degree.
A search device for Pu-238 isotope heat source, comprising:
the first determining module is used for determining the preliminary position of the Pu-238 isotope heat source based on the heating characteristic of the Pu-238 isotope heat source and the remote temperature distribution condition in the accident area;
a second determining module for determining an optimal search line based on the preliminary location, neutron and gamma radiation field levels within the accident area;
the third determining module is used for determining the accurate position of the Pu-238 isotope heat source based on the optimal searching line, the heating characteristic of the Pu-238 isotope heat source and the close-range temperature distribution condition in the accident area by combining the neutron and gamma radiation field levels in the accident area;
a measurement module for measuring the surface and surrounding pollution levels of the Pu-238 isotope heat source based on the accurate location;
and the analysis module is used for analyzing the current situation of the Pu-238 isotope heat source based on the pollution level and the background level when the Pu-238 isotope heat source is well contained.
Further, in the searching device as described above, the first determining module is specifically configured to:
and remotely measuring the remote temperature distribution condition in the accident area by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the preliminary position of the Pu-238 isotope heat source.
Further, in the searching device as described above, the third determining module is specifically configured to:
and measuring the close-range temperature distribution condition in the accident area in a close range by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the accurate position of the Pu-238 isotope heat source by combining the neutron and gamma radiation field level in the accident area.
Further, in the searching device as described above, the measuring module is specifically configured to:
and measuring the surface pollution level of the Pu-238 isotope heat source by a surface pollution measuring instrument based on the accurate position, and measuring the air pollution level of the Pu-238 isotope heat source by an aerosol continuous monitor.
Further, in the searching device as described above, the analysis module is specifically configured to:
and comparing the pollution level with the background level of the Pu-238 isotope heat source when the Pu-238 isotope heat source is well contained, analyzing whether the Pu-238 isotope heat source is scattered or damaged, and evaluating the damage degree.
The invention has the beneficial effects that: the invention adopts a method combining infrared thermal imaging, neutron, gamma and pollution measurement, and the infrared thermal imaging method can quickly perform preliminary positioning in a long distance by the self-heating characteristic of an isotope heat source, is close to a searching process, judges whether the surrounding ground is polluted by pollution measurement, accurately positions the heat source by neutron/gamma dose rate measurement, and judges whether the containment is damaged.
Drawings
FIG. 1 is a schematic flow chart of a method for searching Pu-238 isotope heat source in accordance with an embodiment of the present invention;
FIG. 2 is a flow chart of a method for searching Pu-238 isotope heat source according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a searching apparatus for Pu-238 isotope heat source according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the invention more clear, the technical scheme of the embodiment of the invention will be further described in detail with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
The embodiment of the invention provides a searching method of Pu-238 isotope heat source, as shown in figure 1, comprising the following steps:
s101, determining the primary position of the Pu-238 isotope heat source based on the heating characteristic of the Pu-238 isotope heat source and the remote temperature distribution condition in the accident area.
In the embodiment of the invention, the step of determining the preliminary position of the Pu-238 isotope heat source based on the heating characteristic of the Pu-238 isotope heat source and the remote temperature distribution condition in the accident area comprises the following steps: and (3) remotely measuring the remote temperature distribution condition in the accident area by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the preliminary position of the Pu-238 isotope heat source. Specifically, a thermal infrared imager may be employed. In the embodiment of the invention, a Pu-238 heat source searcher adopts an infrared thermal imager to remotely measure the temperature distribution of an accident area, searches for a hot spot similar to the temperature of the Pu-238 heat source, and determines the approximate position of the Pu-238 heat source.
S102, determining an optimal searching line based on the preliminary position, neutrons and gamma radiation field levels in the accident area.
In the embodiment of the invention, radiation monitoring personnel provide radiation protection support for Pu-238 heat source searching personnel by measuring neutron and gamma radiation field levels in an accident area, and an optimal searching line is adopted to reduce the irradiated dose level.
S103, determining the accurate position of the Pu-238 isotope heat source based on the optimal searching line, the heating characteristic of the Pu-238 isotope heat source and the close-range temperature distribution condition in the accident area by combining the neutron and gamma radiation field levels in the accident area.
In the embodiment of the invention, based on the optimal searching line, the heating characteristic of the Pu-238 isotope heat source and the close-range temperature distribution condition in the accident area, the step of determining the accurate position of the Pu-238 isotope heat source by combining the neutron and gamma radiation field levels in the accident area comprises the following steps: and (3) closely measuring the close-range temperature distribution condition in the accident area by an infrared thermal imaging method, searching for a hot spot with the temperature similar to that of the Pu-238 isotope heat source, and determining the accurate position of the Pu-238 isotope heat source by combining the neutron and gamma radiation field level in the accident area. In the embodiment of the invention, pu-238 heat source searching personnel search the heat source by adopting a thermal imager in a short distance, and accurately position the heat source by combining a neutron dose rate measuring means to obtain the accurate position of the Pu-238 isotope heat source. Specifically, the gamma radiation level of the accident area can be measured using a Pu-238 heat source specific detector and the neutron radiation level of the accident area can be measured using a neutron dose rate.
S104, measuring the pollution level of the surface and the surrounding of the Pu-238 isotope heat source based on the accurate position.
In an embodiment of the present invention, the step of measuring the contamination level of the surface and surrounding of the Pu-238 isotope heat source based on the exact location comprises: based on the accurate position, the surface pollution level of the Pu-238 isotope heat source is measured by a surface pollution measuring instrument, and the air pollution level of the Pu-238 isotope heat source is measured by an aerosol continuous monitor. Specifically, the surface pollution level of the accident area is measured by the surface pollution measuring instrument, if obvious surface pollution exists, the damage of the radioactive source can be judged, the pollution level of the air is measured in the accident area by the aerosol continuous monitoring instrument, and if the pollution is monitored, the damage of the radioactive source can be judged, and the aerosol is generated.
S105, analyzing the current situation of the Pu-238 isotope heat source based on the pollution level and the background level when the Pu-238 isotope heat source is well contained.
In the embodiment of the invention, the step of analyzing the current situation of the Pu-238 isotope heat source based on the pollution level and the background level when the Pu-238 isotope heat source is well contained comprises the following steps: and comparing the pollution level with the background level when the Pu-238 isotope heat source is well contained, analyzing whether the Pu-238 isotope heat source is scattered or damaged, and evaluating the damage degree. In the embodiment of the invention, the measurement result is analyzed, the description of the current situation of the radioactive source is given, and the following aspects are specifically analyzed: whether the inclusion is complete, whether the radioactive source is scattered, whether the radioactive source is damaged, and whether the radioactivity is released. If Pu-238 heat source is intact, no radioactive release is generated, and the radioactive release is directly recovered by recovery personnel. If Pu-238 heat source is damaged, evaluating damage degree, taking wiping samples including nasal cavity and face wiping samples for emergency response personnel, and analyzing internal irradiation hazard suffered by the emergency response personnel; and selecting representative sampling points to sample the environment in the accident area and the accident downwind area.
For example, after ignition and take-off, the nuclear-involved spacecraft can not fly according to a preset track if the nuclear-involved spacecraft fails to fly due to own faults or other factors, and then detonates to terminate the flight task. Because the spacecraft carries a large amount of inflammable and explosive fuel, the fuel and the remains fall into the ground after explosion, and the safety of ground facilities in the landing area is damaged. The explosion combustion can raise the temperature of the remains or fragments of the spacecraft, and uneven temperature distribution can be formed in an accident area, in this case, fire fighters firstly extinguish fire by emergency response of a launching site, and after the remains or fragments are cooled and the temperature is reduced, the Pu-238 heat source can be searched. As shown in fig. 2, the main implementation steps are as follows: s1, a Pu-238 heat source searcher firstly adopts a thermal imager to remotely measure the temperature distribution of an accident area, searches for a hot spot with the temperature similar to that of the Pu-238 heat source, and determines the approximate position of the Pu-238 heat source; s2, measuring neutron and gamma radiation field levels of an accident area by radiation monitoring personnel, providing radiation protection support for Pu-238 heat source searching personnel, and adopting an optimal searching line to reduce the irradiated dose level; s3, searching the heat source by Pu-238 heat source searching personnel at a short distance by adopting a thermal imager, and accurately positioning the heat source by combining a neutron dose rate measuring means; s4, after the approximate position of the Pu-238 heat source is searched, measuring the surface and the periphery of the heat source by adopting a detector, a surface pollution measuring instrument and sampling analysis, and comparing the surface and the periphery with the background level when the Pu-238 radioactive source is well contained; s5, analyzing the measurement result, and giving out the current description of the radioactive source, wherein the current description comprises the following contents: whether the inclusion is complete, whether the radioactive source is scattered, whether the radioactive source is damaged, and whether the radioactivity is released; s6, if the Pu-238 heat source is intact, no radioactive release is generated, the radioactive release is directly recovered by a recovery person; s7, if the Pu-238 heat source is damaged, evaluating the damage degree, taking wiping samples of emergency response personnel, including nasal cavity wiping samples, facial wiping samples and the like, and analyzing internal irradiation hazard suffered by the emergency response personnel; and selecting representative sampling points to sample the environment in the accident area and the accident downwind area.
By adopting the method provided by the embodiment of the invention, the infrared thermal imaging, the neutron, the gamma and the pollution measurement can be combined, the primary positioning is quickly carried out in a long distance through the infrared thermal imaging according to the self-heating characteristic of the isotope heat source, the near searching process is carried out, whether the surrounding ground is polluted or not is judged, the accurate positioning is carried out on the heat source through the neutron/gamma dose rate measurement, and whether the inclusion is damaged or not is judged.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
According to another aspect of the embodiment of the present invention, there is also provided a searching apparatus for Pu-238 isotope heat source, as shown in fig. 3, comprising:
a first determination module 100 is configured to determine a preliminary location of the Pu-238 isotope heat source based on a heating characteristic of the Pu-238 isotope heat source and a remote temperature distribution in the accident area.
In the embodiment of the invention, the preliminary position of the Pu-238 isotope heat source is determined based on the heating characteristic of the Pu-238 isotope heat source and the remote temperature distribution condition in the accident area, and the method comprises the following steps: and (3) remotely measuring the remote temperature distribution condition in the accident area by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the preliminary position of the Pu-238 isotope heat source. Specifically, a thermal infrared imager may be employed. In the embodiment of the invention, a Pu-238 heat source searcher adopts an infrared thermal imager to remotely measure the temperature distribution of an accident area, searches for a hot spot similar to the temperature of the Pu-238 heat source, and determines the approximate position of the Pu-238 heat source.
A second determination module 200 for determining an optimal search line based on the preliminary location, neutron and gamma radiation field levels within the accident area.
In the embodiment of the invention, radiation monitoring personnel provide radiation protection support for Pu-238 heat source searching personnel by measuring neutron and gamma radiation field levels in an accident area, and an optimal searching line is adopted to reduce the irradiated dose level.
A third determining module 300 is configured to determine an accurate position of the Pu-238 isotope heat source based on the optimal search line, the heating characteristics of the Pu-238 isotope heat source, and the close-range temperature distribution in the accident area, in combination with neutron and gamma radiation field levels in the accident area.
In the embodiment of the invention, based on the optimal searching line, the heating characteristic of the Pu-238 isotope heat source and the close-range temperature distribution condition in the accident area, the accurate position of the Pu-238 isotope heat source is determined by combining the neutron and gamma radiation field levels in the accident area, and the method comprises the following steps: and (3) closely measuring the close-range temperature distribution condition in the accident area by an infrared thermal imaging method, searching for a hot spot with the temperature similar to that of the Pu-238 isotope heat source, and determining the accurate position of the Pu-238 isotope heat source by combining the neutron and gamma radiation field level in the accident area. In the embodiment of the invention, pu-238 heat source searching personnel search the heat source by adopting a thermal imager in a short distance, and accurately position the heat source by combining a neutron dose rate measuring means to obtain the accurate position of the Pu-238 isotope heat source. Specifically, the gamma radiation level of the accident area can be measured using a Pu-238 heat source specific detector and the neutron radiation level of the accident area can be measured using a neutron dose rate.
A measurement module 400 for measuring the contamination level of the surface and surrounding of the Pu-238 isotope heat source based on the exact location.
In an embodiment of the invention, measuring the contamination level of the surface and surrounding of the Pu-238 isotope heat source based on the accurate location comprises: based on the accurate position, the surface pollution level of the Pu-238 isotope heat source is measured by a surface pollution measuring instrument, and the air pollution level of the Pu-238 isotope heat source is measured by an aerosol continuous monitor. Specifically, the surface pollution level of the accident area is measured by the surface pollution measuring instrument, if obvious surface pollution exists, the damage of the radioactive source can be judged, the pollution level of the air is measured in the accident area by the aerosol continuous monitoring instrument, and if the pollution is monitored, the damage of the radioactive source can be judged, and the aerosol is generated.
The analysis module 500 is configured to analyze the current status of the Pu-238 isotope heat source based on the pollution level and the background level of the Pu-238 isotope heat source when the Pu-238 isotope heat source is well contained.
In the embodiment of the invention, based on the pollution level and the background level when the Pu-238 isotope heat source is well contained, the method for analyzing the current situation of the Pu-238 isotope heat source comprises the following steps: and comparing the pollution level with the background level when the Pu-238 isotope heat source is well contained, analyzing whether the Pu-238 isotope heat source is scattered or damaged, and evaluating the damage degree. In the embodiment of the invention, the measurement result is analyzed, the description of the current situation of the radioactive source is given, and the following aspects are specifically analyzed: whether the inclusion is complete, whether the radioactive source is scattered, whether the radioactive source is damaged, and whether the radioactivity is released. If Pu-238 heat source is intact, no radioactive release is generated, and the radioactive release is directly recovered by recovery personnel. If Pu-238 heat source is damaged, evaluating damage degree, taking wiping samples including nasal cavity and face wiping samples for emergency response personnel, and analyzing internal irradiation hazard suffered by the emergency response personnel; and selecting representative sampling points to sample the environment in the accident area and the accident downwind area.
By adopting the device provided by the embodiment of the invention, the infrared thermal imaging, the neutron, the gamma and the pollution measurement can be combined, the primary positioning is quickly carried out in a long distance through the infrared thermal imaging according to the self-heating characteristic of the isotope heat source, the near searching process is carried out, whether the surrounding ground is polluted or not is judged, the accurate positioning is carried out on the heat source through the neutron/gamma dose rate measurement, and whether the inclusion is damaged or not is judged.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The integrated units in the above embodiments may be stored in the above-described computer-readable storage medium if implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing one or more computer devices (which may be personal computers, servers or network devices, etc.) to perform all or part of the steps of the method of the various embodiments of the present invention.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
It will be appreciated by persons skilled in the art that the systems and methods of the present invention are not limited to the examples described in the detailed description, which are provided for the purpose of illustrating the invention only and are not intended to limit the invention. Other embodiments will occur to those skilled in the art from a consideration of the specification and practice of the invention as claimed and as claimed in the claims and their equivalents.
Claims (10)
1. A method for searching for a Pu-238 isotope heat source, comprising the steps of:
determining a preliminary position of the Pu-238 isotope heat source based on heating characteristics of the Pu-238 isotope heat source and remote temperature distribution conditions in an accident area;
determining an optimal search line based on the preliminary location, neutrons and gamma radiation field levels within the accident area;
determining the accurate position of the Pu-238 isotope heat source based on the optimal search line, the heating characteristics of the Pu-238 isotope heat source and the close-range temperature distribution condition in the accident area by combining neutron and gamma radiation field levels in the accident area;
measuring the surface and surrounding contamination levels of the Pu-238 isotope heat source based on the accurate location;
and analyzing the current situation of the Pu-238 isotope heat source based on the pollution level and the background level when the Pu-238 isotope heat source is well contained.
2. The searching method according to claim 1, wherein the step of determining the preliminary location of the Pu-238 isotope heat source based on the heating characteristics of the Pu-238 isotope heat source and the remote temperature distribution in the accident area comprises:
and remotely measuring the remote temperature distribution condition in the accident area by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the preliminary position of the Pu-238 isotope heat source.
3. The method of claim 1, wherein determining the exact location of the Pu-238 isotope heat source based on the optimal search line, the exothermic nature of the Pu-238 isotope heat source, and the close range temperature profile within the accident area, in combination with neutron and gamma radiation field levels within the accident area, comprises:
and measuring the close-range temperature distribution condition in the accident area in a close range by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the accurate position of the Pu-238 isotope heat source by combining the neutron and gamma radiation field level in the accident area.
4. The method of claim 1, wherein the step of measuring the contamination level of the surface and surrounding of the Pu-238 isotope heat source based on the accurate location comprises:
and measuring the surface pollution level of the Pu-238 isotope heat source by a surface pollution measuring instrument based on the accurate position, and measuring the air pollution level of the Pu-238 isotope heat source by an aerosol continuous monitor.
5. The method of claim 1, wherein analyzing the status quo of the Pu-238 isotope heat source based on the pollution level and the background level of the Pu-238 isotope heat source when well contained comprises:
and comparing the pollution level with the background level of the Pu-238 isotope heat source when the Pu-238 isotope heat source is well contained, analyzing whether the Pu-238 isotope heat source is scattered or damaged, and evaluating the damage degree.
6. A search device for Pu-238 isotope heat sources, comprising:
the first determining module is used for determining the preliminary position of the Pu-238 isotope heat source based on the heating characteristic of the Pu-238 isotope heat source and the remote temperature distribution condition in the accident area;
a second determining module for determining an optimal search line based on the preliminary location, neutron and gamma radiation field levels within the accident area;
the third determining module is used for determining the accurate position of the Pu-238 isotope heat source based on the optimal searching line, the heating characteristic of the Pu-238 isotope heat source and the close-range temperature distribution condition in the accident area by combining the neutron and gamma radiation field levels in the accident area;
a measurement module for measuring the surface and surrounding pollution levels of the Pu-238 isotope heat source based on the accurate location;
and the analysis module is used for analyzing the current situation of the Pu-238 isotope heat source based on the pollution level and the background level when the Pu-238 isotope heat source is well contained.
7. The searching apparatus of claim 6, wherein the first determining module is specifically configured to:
and remotely measuring the remote temperature distribution condition in the accident area by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the preliminary position of the Pu-238 isotope heat source.
8. The searching apparatus of claim 6, wherein the third determining module is specifically configured to:
and measuring the close-range temperature distribution condition in the accident area in a close range by an infrared thermal imaging method, searching for a hot spot similar to the temperature of the Pu-238 isotope heat source, and determining the accurate position of the Pu-238 isotope heat source by combining the neutron and gamma radiation field level in the accident area.
9. The search device of claim 6, wherein the measurement module is specifically configured to:
and measuring the surface pollution level of the Pu-238 isotope heat source by a surface pollution measuring instrument based on the accurate position, and measuring the air pollution level of the Pu-238 isotope heat source by an aerosol continuous monitor.
10. The search device of claim 6, wherein the analysis module is specifically configured to:
and comparing the pollution level with the background level of the Pu-238 isotope heat source when the Pu-238 isotope heat source is well contained, analyzing whether the Pu-238 isotope heat source is scattered or damaged, and evaluating the damage degree.
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