CN111060949A - Method for estimating detection data background of seawater radionuclide by marine environment parameters - Google Patents
Method for estimating detection data background of seawater radionuclide by marine environment parameters Download PDFInfo
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- CN111060949A CN111060949A CN201911256770.1A CN201911256770A CN111060949A CN 111060949 A CN111060949 A CN 111060949A CN 201911256770 A CN201911256770 A CN 201911256770A CN 111060949 A CN111060949 A CN 111060949A
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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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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F16/2458—Special types of queries, e.g. statistical queries, fuzzy queries or distributed queries
- G06F16/2465—Query processing support for facilitating data mining operations in structured databases
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- G—PHYSICS
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- G06F2216/03—Data mining
Abstract
The invention discloses a method for estimating the data background of seawater radionuclide by marine environmental parameters, which comprises the following steps: (1) setting a marine environment parameter range possibly related to radionuclide detection as an event; (2) traversing a test result database of the radionuclide, finding and listing events of the marine environment parameter range which occur simultaneously with the events of the background value range in the radionuclide detection, and establishing an event data set; (3) traversing the event data set, and finding out all frequent item sets meeting the minimum support threshold; (4) obtaining an association rule meeting a minimum confidence threshold value from the frequent item set; the association rule represents the conditional probability of occurrence of the data background value range of the radionuclide detection when more than two marine environmental parameters occur; (5) and estimating the data background value range of the radionuclide detection by monitoring whether the marine environment parameters in the association rule occur or not. The method provided by the invention solves the problem of a background estimation method generated by the marine environment in the radionuclide detection process in the data acquisition process of the sensor, fully considers the interference of marine environment factors on detection signals, and can improve the accuracy of data calculation in radionuclide detection.
Description
Technical Field
The invention relates to the technical field of seawater detection, in particular to a method for estimating the background of detection data of a seawater radionuclide by marine environment parameters.
Background
In the comprehensive measurement process of the ocean radioactive substances, if corresponding radioactive substances exist, corresponding peaks appear in corresponding energy intervals. Because the peak of the detected radionuclide signal is the result of the action of various factors, including the real result of the radionuclide, and in addition, the error signal collected by the sensor is possibly caused by marine physical parameters, the change of the counting rate of the radionuclide is large. The existing method for monitoring the radioactive environment of seawater is generally based on the premise that a detection signal corresponding to a radioactive substance to be detected in seawater is stable or unchanged, and cannot truly reflect the complex marine environment.
The actual ocean field detection environment is complex and changeable, and interference factors are many. In the actual operation process, the interference of the change of the marine environment on the measurement of marine substances is found, and the phenomenon is that the amplitude of a detected voltage signal can change irregularly, so that the real signal value corresponding to the radioactive nuclide in the seawater is difficult to judge quickly and accurately. Usually, during the radionuclide detection process, a lot of peak fluctuations occur, and there are error signal values caused by interference data.
In the existing radionuclide detection, no effective means can be used for incorporating interference factors caused by marine environment into radioactivity monitoring data calculation. Based on the reasons, the existing data calculation method for the detection of the radioactive nuclide in the seawater has no field real-time performance and does not calculate the real range of the background.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for estimating the background of the detection data of the marine radionuclide by marine environmental parameters, so as to achieve the purpose of improving the efficiency and accuracy of calculating the radionuclide.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for estimating the background of the detection data of the radionuclide in the seawater from marine environmental parameters comprises the following steps:
(1) setting a marine environment parameter range possibly related to radionuclide detection as an event;
(2) traversing a test result database of the radionuclide, finding and listing events of the marine environment parameter range which occur simultaneously with the events of the background value range in the radionuclide detection, and establishing an event data set;
(3) traversing the event data set, and finding out all frequent item sets meeting the minimum support threshold;
(4) obtaining an association rule meeting a minimum confidence threshold value from the frequent item set; the association rule represents the conditional probability of occurrence of the data background value range of the radionuclide detection when more than two marine environmental parameters occur;
(5) and estimating the data background value range of the radionuclide detection by monitoring whether the marine environment parameters in the association rule occur or not.
Further, in the step (1), the marine environmental parameters possibly related to the detection of the radionuclide by the sea comprise flow velocity, effective wave height, water temperature, air pressure, air temperature, air speed and surface seawater salinity; the set event is a value range of each marine environment parameter.
Further, in the step (2), a detected database is searched, and each piece of information recorded in the database is: wave height, water temperature, air pressure, air temperature, wind speed, salinity and background values of radionuclides; the wave height, water temperature, air pressure, air temperature, air speed and salinity information are data synchronously acquired by the radioactive sensor, and the acquisition time and the acquisition place are the same; the radionuclide is a result value calculated by accumulating data for 3 hours, and the environmental parameter is data collected in the 3 hours.
Further, in the step (3), the support degree of the frequent item set is not less than 20%.
Further, in the step (4), the confidence of the association rule is not less than 75%.
According to the method for estimating the background of the detection data of the seawater radionuclide by the marine environmental parameters, provided by the invention, the correlation rule mining is carried out on the data acquired by the radioactive sensor to obtain the relation between the marine environmental parameters and the background value of the radioactive detection data, so that the interference of the marine environmental factors on the detection data is included in the calculation of the radioactive detection data, and the detection accuracy is improved.
The method only aims at the data with the accumulation time length of 3 hours collected by the radioactive sensor, predicts the range of the background corresponding to the radionuclide detection caused by the marine environment interference, has field real-time performance, and can calculate the real range of the background in real time, thereby improving the detection accuracy.
Drawings
FIG. 1 is a schematic flow chart of a method for estimating a background of marine radionuclide K40 data from marine environmental parameters according to an embodiment of the present invention;
FIG. 2 is a diagram of data files of a partial database disclosed in an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of a database according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a method for estimating the background of seawater radionuclide K40 data by marine environment parameters, which comprises the following specific steps as shown in figure 1:
s101, setting a marine environment parameter range which is possibly related to the detection of the radionuclide K40 as an event.
In the present embodiment, the set events are as follows, I1 is event 1:
i1: the flow velocity is 3-5 m/s
I2: the temperature is 15-20 DEG C
I3: effective wave height of 3 m
I4: air temperature of 0-20
I5: wind speed > 5 m/s
I6: salinity is more than 31.2
I7: the temperature is 5-15 DEG C
I8: flow velocity > 5 m/s
I9: the background signal of the radionuclide K40 is in a range of 90-100.
S102, traversing the test result database of the radionuclide K40, finding and listing the events of the marine environment parameter range which occur simultaneously with the events of the background signal range in the radionuclide K40 detection, and establishing an event data set as shown in Table 1.
TABLE 1 Marine environmental parameter Range-radionuclide K40 detection background Signal Range dataset
S103, traversing the data set in the table 1, setting the minimum support degree to be 20%, and obtaining a frequent item set as shown in the table 2.
TABLE 2 frequent item set
S104, generating an association rule from the frequent item set, namely an association rule of the marine environment parameters and the background range of the radionuclide K40 detection: when the 2 marine environmental parameters are characterized, the conditional probability of the occurrence of the signal background value range detected by the radionuclide K40, namely the confidence level (ab) ═ P (a, B)/P (a), is obtained.
When I2 and I3 occur simultaneously, the probability of occurrence of I9 is P (12, I3, I9)/P (I2, I3) ═ 3/4 ═ 75%
That is, when I2 and I3 occur simultaneously, the probability of I9 occurring is 75%.
S105, monitoring marine environment parameters: when the temperature is 15-20 ℃ and the effective wave height is 3 meters, the background range of the estimated radionuclide K40 detection signal is 90-100 intervals.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A method for estimating the background of the detection data of the radionuclide in the seawater by using marine environmental parameters is characterized by comprising the following steps:
(1) setting a marine environment parameter range possibly related to radionuclide detection as an event;
(2) traversing a test result database of the radionuclide, finding and listing events of the marine environment parameter range which occur simultaneously with the events of the background value range in the radionuclide detection, and establishing an event data set;
(3) traversing the event data set, and finding out all frequent item sets meeting the minimum support threshold;
(4) obtaining an association rule meeting a minimum confidence threshold value from the frequent item set; the association rule characterization
When more than two marine environmental parameters occur, the conditional probability of the occurrence of the data background value range of the radionuclide detection;
(5) and estimating the data background value range of the radionuclide detection by monitoring whether the marine environment parameters in the association rule occur or not.
2. The method for estimating the background of data on radionuclide detection in sea according to claim 1, wherein in step (1), the parameters of sea environment that are likely to be related to the detection of radionuclide by sea include flow velocity, effective wave height, water temperature, air pressure, air temperature, wind speed, salinity of surface sea; the set event is a value range of each marine environment parameter.
3. The method for estimating background of data for detecting radionuclides in seawater as claimed in claim 1 wherein, in step (2), the database that has been detected is searched, and each piece of information recorded in the database is: wave height, water temperature, air pressure, air temperature, wind speed, salinity and background values of radionuclides; the wave height, water temperature, air pressure, air temperature, air speed and salinity information are data synchronously acquired by the radioactive sensor, and the acquisition time and the acquisition place are the same; the radionuclide is a result value calculated by accumulating data for 3 hours, and the environmental parameter is data collected in the 3 hours.
4. The method for estimating background of data for detection of radionuclides in seawater as claimed in claim 1 wherein, in step (3), the support of the frequent itemset is not less than 20%.
5. The method for estimating background of detection data for radionuclides in seawater as claimed in claim 1 wherein, in step (4), the confidence of the association rule is not less than 75%.
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