Method for measuring uranium mine air return shaft radon emissions

A technology of air return shaft and discharge volume, which is applied in the field of uranium mining and metallurgy industry, can solve the problems that cannot meet the requirements of radiation protection and evaluation of uranium mines, and achieve measurement accuracy, small sampling uncertainty and statistical fluctuation, Highly Accurate Effects

Active Publication Date: 2015-09-02
NANHUA UNIV
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  • Description
  • Claims
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Problems solved by technology

However, the commonly used conventional measurement methods cannot solve the problems of reliability and convenience at the same time, and cannot meet the requirements of radiation protection and evaluation of uranium mines.

Method used

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  • Method for measuring uranium mine air return shaft radon emissions
  • Method for measuring uranium mine air return shaft radon emissions
  • Method for measuring uranium mine air return shaft radon emissions

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Embodiment Construction

[0037] A method for measuring radon emission in return air shafts of uranium mines, the specific measurement method is as follows:

[0038] The present embodiment adopts nine-point method to measure, at first adopts nine-point method to measure wind speed Vi and radon concentration Ci at each point of a certain section in the wellhead of return air shaft 1, wherein nine sampling points are respectively away from return air shaft 1 well wall distance : x1 is 3%d; x2 is 10%d; x3 is 20%d; x4 is 30%d; x5 is 50%d; x6 is 70%d; x7 is 80%d; x8 is 90%d; x9 is 97%d; where d is the outlet diameter of return air shaft 1, in m.

[0039] According to the measured wind speed values ​​at the nine sampling points, the expression formula of the wind speed V and the radial distance x of the return air shaft 1 is deduced by interpolation method:

[0040] (1)

[0041] get:

[0042] (1-1) (1-2)

[0043] (1-3)

[0044] (1-4)

[0045] (1-5) ...

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Abstract

Provided is a method for measuring uranium mine air return shaft radon emissions. Firstly, a multi-point method is adopted to perform radon concentration measurement on the specific sample points at the uranium mine air return shaft head, and average outlet air speed and average radon concentration in a radial specific area at the air return shaft head are calculated, and the product of the average air speed value and radon concentration mean value of each area and the area of the specific area is weighted to calculate the radon release rate of the air return shaft. For a specific air return shaft, a constant numerical relationship exists between the release rate and the shaft center air speed and the shaft center radon concentration of a cross section and the area of the cross section, and the conversion coefficient of the air return shaft is obtained based on the rule and through the calculation of measured data. In the subsequent measurement of the radon release rate of the uranium mine air return shaft, one only needs to measure the shaft center radon concentration and air speed of the cross section of the air return shaft, multiplies the radon concentration and air speed values by the conversion coefficient and the sectional area of the air return shaft outlet to obtain the radon release rate of the uranium mine air return shaft, and then multiplies the radon release rate by the radon emission time of the air return shaft to calculate the radon emission value of the uranium mine air return shaft.

Description

technical field [0001] The invention relates to the technical field of uranium mining and metallurgy industry, in particular to a method for measuring the radon emission of a return air shaft of a uranium mine. Background technique [0002] In the process of uranium mining, surveying and ore processing, radon and its daughters precipitated from uranium ore are harmful to the health of uranium mine workers and pollute the surrounding environment of uranium mines. At present, in the process of uranium mining, mechanical ventilation is used to discharge the radon precipitated in the mine into the atmosphere through the return air shaft. , the monitoring of radon emissions from return air shafts has become a necessary work during the mining of uranium mines. At present, conventional measurement methods are used for the measurement of radon emissions from return air shafts of uranium mines. The conventional measurement method is to measure the radon concentration at the outlet o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/00G06F19/00
Inventor 周青芝肖德涛赵桂芝居治豪
Owner NANHUA UNIV
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