CN112649888B - Uranium ore quantitative scale coefficient solving method based on energy spectrum logging characteristic spectrum peak - Google Patents

Uranium ore quantitative scale coefficient solving method based on energy spectrum logging characteristic spectrum peak Download PDF

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CN112649888B
CN112649888B CN202011328036.4A CN202011328036A CN112649888B CN 112649888 B CN112649888 B CN 112649888B CN 202011328036 A CN202011328036 A CN 202011328036A CN 112649888 B CN112649888 B CN 112649888B
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uranium
natural gamma
characteristic spectrum
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thorium
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王海涛
汤彬
王仁波
刘志锋
黄凡
张丽娇
周书民
张雄杰
张焱
陈锐
刘琦
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East China Institute of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
    • G01V5/04—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
    • G01V5/06—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging for detecting naturally radioactive minerals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
    • G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract

The invention discloses a uranium ore quantitative scale coefficient calculation method based on an energy spectrum logging characteristic spectrum peak. The method comprises the steps of dividing a natural gamma energy spectrum curve into a plurality of characteristic spectrum peaks corresponding to thorium, uranium-radium and potassium elements, wherein a scale coefficient represents a constant which is scaled in a saturated ore bed and is responded by a logging instrument, and represents the counting rate of all gamma rays emitted by a certain radioactive element with unit content in the saturated ore bed in response to each characteristic spectrum peak. The uranium ore quantitative scale coefficient solving method based on the energy spectrum logging characteristic spectrum peak realizes accurate quantification of three natural gamma radioactive elements including thorium, uranium-radium and potassium.

Description

Uranium ore quantitative scale coefficient solving method based on energy spectrum logging characteristic spectrum peak
Technical Field
The invention belongs to the field of nuclear radiation detection, and can realize accurate quantification of various radioactive elements through natural gamma-ray spectrum logging in the uranium ore exploration industry, and is particularly suitable for uranium-thorium mixed type or uranium-thorium-potassium mixed type minerals.
Background
Natural gamma-ray logging is a common geophysical method for drilling wells and is also the basic method for uranium exploration. It is prepared by detecting natural decay series (uranium series, thorium series, actinium uranium series, etc.) and potassium ( 40 K) The total amount of gamma rays or the spectral count rate (both of which are proportional to the decay rate),and calculating the content of uranium, thorium or potassium elements in the formation rock, which are characterized by the initial nuclide. The natural gamma logging is to place a gamma total amount logging instrument or a gamma energy spectrum logging instrument into a borehole, measure the natural gamma irradiation rate of rock ore on the borehole wall, and determine the position and the thickness of a radioactive stratum penetrated by the borehole and the content of radioactive elements (uranium, thorium and potassium) according to a gamma irradiation rate curve along the depth of the borehole. At present, gamma logging is a main method for reserve calculation in the exploration of uranium deposits and uranium-thorium mixed deposits, and especially when the core sampling rate in a drill hole is not high, gamma logging based on quantitative radioactive elements is particularly important. The gamma logging standard of China only requires a natural gamma total logging method with mature technology to be adopted as a main basis for quantifying uranium in stratum rocks.
In the uranium system and the thorium system in the nature, under the radioactive equilibrium state, the proportional relation of the atomic numbers of nuclides in the system is determined, so the relative intensities of gamma rays with different energies are also determined, and the energies of the gamma rays of the characteristic nuclides of a certain nuclide can be selected from the two systems respectively to identify uranium and thorium. The energy of gamma rays emitted by a characteristic nuclide, called characteristic energy, is used in natural gamma-ray spectral logging, e.g. in the uranium family 214 The gamma rays of 1.76MeV emitted by Bi identify uranium, optionally in the thorium series 208 Tl emits a gamma ray of 2.62MeV to identify thorium and a gamma ray of 1.46MeV to identify potassium. If the gamma rays are counted according to the selected characteristic energy respectively, the spectrum is measured. The energy of the gamma rays emitted by the particles is plotted in a coordinate system, the abscissa represents the energy of the gamma rays, and the ordinate represents the corresponding intensity of the gamma rays with the energy, so that a relation graph of the energy and the intensity of the gamma rays is obtained, and the graph is called an energy spectrum graph or an energy spectrum curve graph of natural gamma rays. Therefore, the measured natural gamma energy spectrum is converted into the content of uranium, thorium and potassium in the stratum and is output in the form of a continuous logging curve, and thus the natural gamma energy spectrum logging is carried out.
Compared with natural gamma total amount logging, the natural gamma energy spectrum logging can not only realize the function of total amount logging, but also obtain more useful information and determine the content of uranium, thorium and potassium in the stratum so as to divide the stratum in more detail and research various geological problems related to the distribution of radioactive elements. For example, for mixed uranium deposit, the natural gamma total logging cannot realize accurate uranium deposit quantification, and a natural gamma energy spectrum logging method applicable to uranium deposit needs to be researched. The uranium ore quantitative scale coefficient calculation method based on the energy spectrum logging characteristic spectrum peak can realize accurate quantification of radioactive elements of thorium, uranium-radium and potassium. So far, no report of applying the method to uranium ore natural energy spectrum logging production practice is seen.
Disclosure of Invention
The invention aims to provide a uranium ore quantitative scale coefficient calculation method based on an energy spectrum logging characteristic spectrum peak, which aims to realize accurate quantification of different types of radioactive elements through natural gamma energy spectrum logging in the uranium ore exploration industry.
The purpose of the invention is realized by the following technical scheme:
(1) according to the positions of the characteristic peaks of different radioactive elements, a natural gamma energy spectrum curve is divided into m characteristic spectrum peaks, which are respectively: i thorium systems, j uranium-radium systems and k potassium systems, wherein m is i + j + k;
(2) calculating the counting rate of m characteristic spectrum peaks on a natural gamma radioactive background standard model
Figure GDA0003670844890000021
Respectively solving the counting rates of corresponding m characteristic spectrum peaks on natural gamma radioactive standard models of thorium element, uranium-radium element and potassium element
Figure GDA0003670844890000022
Wherein x represents one of natural gamma radioactive elements of thorium, uranium-radium and potassium. The specific method comprises the following steps:
1) calculating the counting rate of thorium characteristic spectrum peak on a natural gamma radioactive background standard model
Figure GDA0003670844890000023
Counting rate of characteristic spectrum peak of uranium-radium system
Figure GDA0003670844890000024
Count rate of potassium characteristic spectrum peaks
Figure GDA0003670844890000025
2) At a nominal content of Q Th The counting rate of each characteristic spectrum peak corresponding to the thorium element is obtained on a natural gamma radioactive thorium element standard model
Figure GDA0003670844890000026
At a nominal content of Q Th The counting rate of each characteristic spectrum peak corresponding to the uranium-radium element is calculated on a natural gamma radioactive thorium element standard model
Figure GDA0003670844890000027
At a nominal content of Q Th The counting rate of each characteristic spectrum peak corresponding to the potassium element is obtained on the natural gamma radioactive thorium element standard model
Figure GDA0003670844890000028
3) At a nominal content of Q U The counting rate of each characteristic spectrum peak corresponding to the thorium element is calculated on a natural gamma radioactive uranium element standard model
Figure GDA0003670844890000029
At a nominal content of Q U The counting rate of each characteristic spectrum peak corresponding to the uranium-radium element is calculated on a natural gamma radioactive uranium element standard model
Figure GDA00036708448900000210
At a nominal content of Q U The counting rate of each characteristic spectrum peak corresponding to the potassium element is obtained on the natural gamma radioactive uranium element standard model
Figure GDA0003670844890000031
4) At a nominal content of Q K The counting rate of each characteristic spectrum peak corresponding to the thorium element is calculated on a natural gamma radioactive potassium element standard model
Figure GDA0003670844890000032
At a nominal content of Q K The counting rate of each characteristic spectrum peak corresponding to the uranium-radium element is calculated on a natural gamma radioactive potassium element standard model
Figure GDA0003670844890000033
At a nominal content of Q K The counting rate of each characteristic spectrum peak corresponding to the potassium element is obtained on the natural gamma radioactive potassium element standard model
Figure GDA0003670844890000034
(3) And (3) solving a uranium ore quantitative energy spectrum stripping coefficient based on an energy spectrum logging characteristic spectrum peak, wherein the stripping coefficient of the element x to the element y on the characteristic spectrum peak m can be expressed as follows:
Figure GDA0003670844890000035
wherein x and y represent arbitrary natural gamma radioactive elements, and x/y represents an element x to an element y, Q x And (3) expressing the nominal content of the radioactive standard model element x, wherein m represents each characteristic spectrum peak, and m belongs to i + j + k and m belongs to y.
The specific process is as follows:
1) stripping coefficient of thorium element to each characteristic spectrum peak of thorium element
Figure GDA0003670844890000036
All are stripping coefficients of 1, uranium-radium element to each characteristic spectrum peak of the uranium-radium element
Figure GDA0003670844890000037
All are 1, the stripping coefficient of potassium element to each characteristic spectrum peak of the potassium element
Figure GDA0003670844890000038
Are all 1;
2) using a natural gamma radioactive background standard model with a nominal content of Q Th Standard model of natural gamma radioactive thorium element and nominal content Q U The standard model of natural gamma radioactive uranium element is used for solving the stripping coefficient of i characteristic spectrum peaks of thorium element by uranium-radium element:
Figure GDA0003670844890000039
3) using a natural gamma radioactive background standard model with a nominal content of Q Th Standard model of natural gamma-ray radioactive thorium element and nominal content of Q K The stripping coefficient of the i characteristic spectrum peaks of the thorium element by the potassium element is calculated by the natural gamma radioactive potassium element standard model:
Figure GDA00036708448900000310
4) using a natural gamma radioactive background standard model with a nominal content of Q U Standard model of natural gamma-ray radioactive uranium element and nominal content of Q Th The natural gamma radioactive thorium element standard model is used for solving the stripping coefficient of the thorium element to j characteristic spectrum peaks of the uranium-radium element:
Figure GDA00036708448900000311
5) using a natural gamma radioactive background standard model with a nominal content of Q U Standard model of natural gamma-ray radioactive uranium-radium element and nominal content of Q K The standard model of natural gamma radioactive potassium element is used for solving the stripping coefficient of j characteristic spectrum peaks of uranium-radium element by potassium element:
Figure GDA0003670844890000041
6) using a natural gamma radioactive background standard model with a nominal content of Q K Standard model of natural gamma radioactive potassium element and nominal content Q Th The natural gamma radioactive thorium element standard model is used for solving the stripping coefficient of the thorium element to k characteristic spectrum peaks of the potassium element:
Figure GDA0003670844890000042
7) using a natural gamma radioactive background standard model with a nominal content of Q K Standard model of natural gamma radioactive potassium element and nominal content Q U The standard model of natural gamma radioactive uranium-radium element is used for solving the stripping coefficient of k characteristic spectrum peaks of the uranium-radium element to the potassium element:
Figure GDA0003670844890000043
8) and (4) integrating the steps 1) to 7) in the step (3) to obtain the natural gamma energy spectrum stripping coefficient based on the characteristic spectrum peak:
Figure GDA0003670844890000044
can be formulated as:
Figure GDA0003670844890000045
(4) and (3) calculating a uranium ore quantitative conversion coefficient based on the energy spectrum logging characteristic spectrum peak, wherein the conversion coefficient of the element y on the characteristic spectrum peak m can be expressed as:
Figure GDA0003670844890000046
wherein y represents an arbitrary natural gamma radioactive element, Q y And (3) expressing the nominal content of the radioactive standard model element y, wherein m represents each characteristic spectrum peak, and m belongs to i + j + k and m belongs to y.
The method comprises the following specific steps:
1) using a natural gamma radioactive background standard model with a nominal content of Q Th The natural gamma radioactive thorium element standard model calculates the conversion coefficient of each characteristic spectrum peak corresponding to the thorium element:
Figure GDA0003670844890000051
2) using a natural gamma radioactive background standard model with a nominal content of Q U The standard model of natural gamma radioactive uranium-radium element is used for solving the conversion coefficient of the uranium-radium element corresponding to each characteristic spectrum peak:
Figure GDA0003670844890000052
3) using a natural gamma radioactive background standard model with a nominal content of Q K The standard model of natural gamma radioactive potassium element in (1) is used for solving the conversion coefficient of each characteristic spectrum peak corresponding to the potassium element:
Figure GDA0003670844890000053
the matrix approach can be expressed as:
Figure GDA0003670844890000054
(5) and (3) calculating quantitative scale coefficients of the uranium ores based on the characteristic spectral peaks of the energy spectrum logging:
Figure GDA0003670844890000055
wherein n, x and y represent any natural gamma radioactive elements, n is x + y, m represents each characteristic spectrum peak, m is i + j + k, and m is y.
The matrix approach can be expressed as:
Figure GDA0003670844890000056
in the actual quantitative process of the uranium ores, a quantitative calibration coefficient calculation method of the uranium ores based on characteristic spectral peaks of energy spectrum logging is utilized, and stripping coefficients are established
Figure GDA0003670844890000061
Conversion factor
Figure GDA0003670844890000062
Content of natural gamma radioactive elements and counting rate of characteristic spectrum peak
Figure GDA0003670844890000063
The correlation equation can strip the influence of other natural gamma radioactive elements in the process of analyzing the content of a certain radioactive element, and solve the content of uranium-radium element, thorium and potassium element, thereby realizing the quantification of uranium ore. The invention has the advantages that: by utilizing a uranium ore quantitative scale coefficient solving method based on a characteristic spectrum peak of energy spectrum logging, the influence of other natural gamma radioactive elements can be removed in the analysis process of the content of a certain radioactive element, and the accurate quantification of radioactive elements such as thorium, uranium-radium, potassium and the like is realized.
Drawings
FIG. 1 is a flowchart of scale factor calculation in embodiment 1 of the present invention;
FIG. 2 is an example of a characteristic spectrum peak dividing method of a natural gamma energy spectrum curve containing thorium, uranium-radium and potassium radioactive elements in example 1 of the present invention;
fig. 3 is a schematic diagram of a process for quantifying radioactive elements of thorium, uranium-radium, and potassium in uranium ore logging in embodiment 1 of the present invention.
In the figure: 1-natural gamma-ray spectrum logging curve, 2-dividing a plurality of characteristic spectrum peaks of thorium, uranium, radium and potassium, 3-selecting a background model and thorium, uranium and potassium models with known contents, 4-measuring natural gamma-ray spectrum curve data of each model, 5-counting rate of each characteristic spectrum peak, 6-stripping coefficient, 7-conversion coefficient and 8-scale coefficient.
Detailed Description
The invention is described in more detail below with reference to the figures and the detailed description.
The method is characterized in that a natural gamma energy spectrum curve is divided into a plurality of characteristic spectrum peaks corresponding to thorium, uranium-radium and potassium elements, a scale coefficient represents a constant which is scaled in a saturated ore bed and is responded by a logging instrument, and the counting rate of all gamma rays emitted by a certain radioactive element with unit content in the saturated ore bed in response to each characteristic spectrum segment is represented.
The invention discloses a uranium ore quantitative scale coefficient calculation method based on an energy spectrum logging characteristic spectrum peak, which comprises the following steps of:
(1) according to the positions of the characteristic peaks of different radioactive elements, a natural gamma energy spectrum curve is divided into m characteristic spectrum peaks, which are respectively: i thorium systems, j uranium-radium systems and k potassium systems, wherein m is i + j + k;
(2) calculating the counting rate of m characteristic spectrum peaks on a natural gamma radioactive background standard model
Figure GDA0003670844890000064
Respectively solving the counting rates of corresponding m characteristic spectrum peaks on natural gamma radioactive standard models of thorium element, uranium-radium element and potassium element
Figure GDA0003670844890000065
Wherein x represents one of natural gamma radioactive elements of thorium, uranium-radium and potassium. The specific method comprises the following steps:
1) calculating the counting rate of thorium characteristic spectrum peak on a natural gamma radioactive background standard model
Figure GDA0003670844890000066
Counting rate of characteristic spectrum peak of uranium-radium system
Figure GDA0003670844890000071
Count rate of potassium characteristic spectrum peaks
Figure GDA0003670844890000072
2) At a nominal content of Q Th The counting rate of each characteristic spectrum peak corresponding to the thorium element is calculated on a natural gamma radioactive thorium element standard model
Figure GDA0003670844890000073
At a nominal content of Q Th The counting rate of each characteristic spectrum peak corresponding to the uranium-radium element is calculated on a natural gamma radioactive thorium element standard model
Figure GDA0003670844890000074
At a nominal content of Q Th The counting rate of each characteristic spectrum peak corresponding to the potassium element is calculated on the natural gamma radioactive thorium element standard model
Figure GDA0003670844890000075
3) At a nominal content of Q U The counting rate of each characteristic spectrum peak corresponding to the thorium element is calculated on a natural gamma radioactive uranium element standard model
Figure GDA0003670844890000076
At a nominal content of Q U The counting rate of each characteristic spectrum peak corresponding to the uranium-radium element is calculated on a natural gamma radioactive uranium element standard model
Figure GDA0003670844890000077
At a nominal content of Q U The counting rate of each characteristic spectrum peak corresponding to the potassium element is obtained on the natural gamma radioactive uranium element standard model
Figure GDA0003670844890000078
4) At a nominal content of Q K The counting rate of each characteristic spectrum peak corresponding to the thorium element is obtained on a natural gamma radioactive potassium element standard model
Figure GDA0003670844890000079
At a nominal content of Q K The counting rate of each characteristic spectrum peak corresponding to the uranium-radium element is solved on a natural gamma radioactive potassium element standard model
Figure GDA00036708448900000710
At a nominal content of Q K The counting rate of each characteristic spectrum peak corresponding to the potassium element is obtained on the natural gamma radioactive potassium element standard model
Figure GDA00036708448900000711
(3) And (3) solving a uranium ore quantitative energy spectrum stripping coefficient based on an energy spectrum logging characteristic spectrum peak, wherein the stripping coefficient of the element x to the element y on the characteristic spectrum peak m can be expressed as follows:
Figure GDA00036708448900000712
wherein x and y represent arbitrary natural gamma radioactive elements, and x/y represents an element x to an element y, Q x And (3) expressing the nominal content of the radioactive standard model element x, wherein m represents each characteristic spectrum peak, and m belongs to i + j + k and m belongs to y.
The specific process is as follows:
1) stripping coefficient of thorium element to each characteristic spectrum peak of thorium element
Figure GDA00036708448900000713
The stripping coefficients of 1 and uranium-radium elements to each characteristic spectrum peak of the uranium-radium elements
Figure GDA00036708448900000714
All are 1, the stripping coefficient of potassium element to each characteristic spectrum peak of the potassium element
Figure GDA00036708448900000715
Are all 1;
2) using natural gaesHorse radioactivity background standard model with nominal content of Q Th Standard model of natural gamma-ray radioactive thorium element and nominal content of Q U The standard model of natural gamma radioactive uranium element is used for solving the stripping coefficient of i characteristic spectrum peaks of thorium element by uranium-radium element:
Figure GDA0003670844890000081
3) using a natural gamma radioactive background standard model with a nominal content of Q Th Standard model of natural gamma-ray radioactive thorium element and nominal content of Q K The stripping coefficient of the i characteristic spectrum peaks of the thorium element by the potassium element is calculated by the natural gamma radioactive potassium element standard model:
Figure GDA0003670844890000082
4) using a natural gamma radioactive background standard model with a nominal content of Q U Standard model of natural gamma radioactive uranium element and nominal content Q Th The stripping coefficient of j characteristic spectrum peaks of the uranium-radium element by the thorium element is calculated by a natural gamma radioactive thorium element standard model:
Figure GDA0003670844890000083
5) using a standard model of natural gamma radioactive background with a nominal content of Q U Standard model of natural gamma-ray radioactive uranium-radium element and nominal content of Q K The standard model of natural gamma radioactive potassium element is used for solving the stripping coefficient of j characteristic spectrum peaks of uranium-radium element by potassium element:
Figure GDA0003670844890000084
6) using a natural gamma radioactive background standard model with a nominal content of Q K Standard model of natural gamma radioactive potassium element and nominal content Q Th The natural gamma radioactive thorium element standard model is used for solving the stripping coefficient of the thorium element to k characteristic spectrum peaks of the potassium element:
Figure GDA0003670844890000085
7) using a natural gamma radioactive background standard model with a nominal content of Q K Standard model of natural gamma radioactive potassium element and nominal content Q U The standard model of natural gamma radioactive uranium-radium element is used for solving the stripping coefficient of k characteristic spectrum peaks of the uranium-radium element to the potassium element:
Figure GDA0003670844890000086
8) and (4) integrating the steps 1) to 7) in the step (3) to obtain the natural gamma energy spectrum stripping coefficient based on the characteristic spectrum peak:
Figure GDA0003670844890000091
can be formulated as:
Figure GDA0003670844890000092
(4) and (3) calculating a uranium ore quantitative conversion coefficient based on the energy spectrum logging characteristic spectrum peak, wherein the conversion coefficient of the element y on the characteristic spectrum peak m can be expressed as:
Figure GDA0003670844890000093
wherein y represents an arbitrary natural gamma radioactive element, Q y And (3) expressing the nominal content of the radioactive standard model element y, wherein m represents each characteristic spectrum peak, and m belongs to i + j + k and m belongs to y.
The method comprises the following specific steps:
1) using a natural gamma radioactive background standard model with a nominal content of Q Th The natural gamma radioactive thorium element standard model calculates the conversion coefficient of each characteristic spectrum peak corresponding to the thorium element:
Figure GDA0003670844890000094
2) using a standard model of natural gamma radioactive background with a nominal content of Q U The conversion coefficient of each characteristic spectrum peak corresponding to the uranium-radium element is obtained by the standard model of natural gamma radioactive uranium-radium element:
Figure GDA0003670844890000095
3) using a natural gamma radioactive background standard model with a nominal content of Q K The standard model of natural gamma radioactive potassium element is used for solving the conversion coefficient of potassium element corresponding to each characteristic spectrum peak:
Figure GDA0003670844890000096
the matrix approach can be expressed as:
Figure GDA0003670844890000101
(5) and (3) calculating quantitative scale coefficients of the uranium ores based on the characteristic spectral peaks of the energy spectrum logging:
Figure GDA0003670844890000102
wherein n, x and y represent any natural gamma radioactive elements, n is x + y, m represents each characteristic spectrum peak, m is i + j + k, and m is y.
The matrix approach can be expressed as:
Figure GDA0003670844890000103
(6) the content q of the radioactive element is obtained according to the following formula x ：
Figure GDA0003670844890000104
Can be formulated as:
Figure GDA0003670844890000111
wherein x and y represent any natural gamma radioactive elements (thorium, uranium-radium and potassium respectively), x/y represents element x to element y, m represents each characteristic spectrum peak, m is i + j + k, and m belongs to y.
If i, j and k are all 1, a characteristic spectrum peak is selected for thorium element, uranium-radium element and potassium element, natural gamma-ray spectrum logging is completed by the process shown in fig. 3 of the embodiment 1, the radioactive element content of thorium, uranium-radium and potassium is obtained, and the results of measurement and interpretation on a standard hard rock model well of a nuclear industry radioactive exploration metering station (Shibata) are shown in table 2. Comparing the data in table 2 shows that: by utilizing a uranium ore quantitative scale coefficient solving method based on a characteristic spectrum peak of energy spectrum logging, the influence of other natural gamma radioactive elements can be removed in the analysis process of the content of a certain radioactive element, and the accurate quantification of radioactive elements such as thorium, uranium-radium, potassium and the like is realized.
TABLE 1 Gamma-nuclide data sheet for Natural radioactive decay (only characteristic Gamma-rays with high radiation probability and energy are listed)
Figure GDA0003670844890000112
Note: data are presented for characteristic gamma rays and their gamma nuclides for only radiation probability >0.001 (meaning the radiation probability of a single radioactive decay), thorium, uranium-radium, and potassium emissions with energy >0.4 MeV.
Table 2 measurement of interpretation results on standard model of natural gamma-radioactive uranium element
Figure GDA0003670844890000113
Figure GDA0003670844890000121
Note 1: the radium content is expressed as the uranium content at equilibrium;
note 2: the content of potassium (K) is meant to include 40 The content of all potassium elements including K;
note 3: the content of the auxiliary elements close to the background value is not explained.

Claims (1)

1. A uranium ore quantitative scale coefficient solving method based on an energy spectrum logging characteristic spectrum peak comprises the following steps:
(1) according to the positions of the characteristic peaks of different radioactive elements, a natural gamma energy spectrum curve is divided into m characteristic spectrum peaks, which are respectively: i thorium systems, j uranium-radium systems and k potassium systems, wherein m is i + j + k;
(2) calculating the counting rate of m characteristic spectrum peaks on a natural gamma radioactive background standard model
Figure FDA0003725577330000014
Respectively solving the counting rates of corresponding m characteristic spectrum peaks on natural gamma radioactive standard models of thorium element, uranium-radium element and potassium element
Figure FDA0003725577330000015
Wherein x represents one of natural gamma radioactive elements of thorium, uranium-radium and potassium;
(3) and (3) solving a uranium ore quantitative energy spectrum stripping coefficient based on an energy spectrum logging characteristic spectrum peak, wherein the stripping coefficient of the element x to the element y on the characteristic spectrum peak m can be expressed as follows:
Figure FDA0003725577330000011
wherein x and y represent arbitrary natural gamma radioactive elements, and x/y represents an element x to an element y, Q x Representing standard model elements of radioactivityNominal content of element x, m represents each characteristic spectrum peak, m ═ i + j + k, m ∈ y;
(4) and (3) calculating a uranium ore quantitative conversion coefficient based on the energy spectrum logging characteristic spectrum peak, wherein the conversion coefficient of the element y on the characteristic spectrum peak m can be expressed as:
Figure FDA0003725577330000012
wherein y represents an arbitrary natural gamma radioactive element, Q y Representing the nominal content of a radioactive standard model element y, wherein m represents each characteristic spectrum peak, and belongs to y;
(5) and (3) calculating quantitative scale coefficients of the uranium ores based on the characteristic spectral peaks of the energy spectrum logging:
Figure FDA0003725577330000013
wherein n, x and y represent any natural gamma radioactive elements, n is x + y, m represents each characteristic spectrum peak, m is i + j + k, and m belongs to y;
in the actual quantitative process of the uranium ores, the influence of other natural gamma radioactive elements can be removed in the analysis process of the content of a certain radioactive element by using a uranium ore quantitative scale coefficient calculation method based on a characteristic spectrum peak of energy spectrum logging, so that the accurate quantification of the radioactive elements of thorium, uranium-radium and potassium is realized.
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