Precession drilling-type activated carbon package gamma spectrum radon measurement method

Abstract

The invention belongs to the field of uranium exploration, and particularly relates to a precession drilling-type activated carbon package gamma spectrum radon measurement method. The method comprises the following steps: a precession-type drill bit, an activated carbon package, a self-sealing transparent plastic bag and a gauze bag are customized; a radon decay daughter region of interest and a thorium decay daughter region of interest on a ground gamma spectrometer are set; the overburden ratio of the ground gamma spectrometer and a radon concentration conversion factor are determined; the activated carbon package is packaged; field data are acquired; and the data are processed and corrected. The method can effectively capture radon in a gas, liquid or particle state in a geogas, a radon decay daughter <214>Bi characteristic energy peak net counting rate is measured, the radon concentration is converted after correction and processing, the tedious operation of the conventional activated carbon radon measurement method is simplified significantly, the radon measurement economic cost is greatly reduced and the radon measurement data reliability is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of uranium ore exploration, and in particular relates to a method for measuring radon with a precession drilling type activated carbon package gamma energy spectrum. Background technique [0002] The natural carbon radon measurement method is a prospecting method in the field of uranium ore exploration. It is a cumulative adsorption radon measurement method. Better indication of deep uranium mineralization information. [0003] The activated carbon radon measurement method is to embed an activated carbon device in the soil, use the strong adsorption of activated carbon to capture radon in the ground gas, and measure the radon concentration in the soil through a gamma measuring device. The traditional activated carbon radon measurement method has the following disadvantages: first, the lead tank shielding device of the activated carbon measuring instrument is heavy and inconvenient to carry; Large, increasi...

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Problems solved by technology

The traditional activated carbon radon measurement method has the following disadvantages: first, the lead tank shielding device of the activated carbon measuring instrument is heavy and inconvenient to carry; Large, increasing the statistical fluctuation error; third, the amount of carbon contained in the plastic bottle of activated carbon is small, the thickness of the activated carbon in the plastic bottle after the activated carbon is installed is 3.5cm, and the amount of radon gas absorbed by the bottom of the bottle after embedding is obviously greater than that of the bottle mouth The amount of radon gas adsorbed nearby, and the activated carbon itself absorbs gamma rays. The actual measurement is to measure the bottom of the bottle close to the probe, which causes a large error; Fourth, it is time-consuming and laborious to dig pits manually, and the depth of the pits is often different; Second, the activated carbon capture device is too cumbersome and requires desiccant, silk floss, plastic bottles, cups, etc., which is inconvenient to carry and assemble

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