Method and device for determining radioactive intensity of methane

Abstract

The invention discloses method and device for determining radioactive intensity of methane. The method comprises the steps of: A, oxidizing a methane sample, marked with C-14, with O2 into CO2 through high-temperature silica gel immobilized with cobalt chloride in a sealed condition, then continuing to import oxygen; B, absorbing CO2 in gas generated by the oxidation with an alkaline scintillation solution after the CO2 is condensed and purified; and C, uniformly shaking an absorption liquid, and directly measuring the C-14 radioactive intensity of a mixed liquid with a liquid scintiloscope. The invention further discloses a device for determining radioactive intensity of C-14 marked methane, wherein an injector is connected with a controllable L-shaped needle head, the injector and the controllable L-shaped needle head are inserted into a high-temperature resistant quartz tube after passing through a high-temperature resistant rubber stopper, an oxygen tube is inserted into the high-temperature resistant quartz tube, the high-temperature resistant quartz tube is threaded through a tubular muffle furnace, and the high-temperature resistant quartz tube and the high-temperature resistant rubber stopper are connected with a condenser, a buffer tube and the L-shaped needle head through glass tubes in sequence. The method and the device have the characteristics of fast and convenient operation and high accuracy, and are suitable for the analysis of the radioactive intensity of C-14 marked methane and the determination of a sample with less C-14 content.

Description

technical field [0001] The invention relates to a method for measuring the radioactive intensity of C-14 labeled methane and a device for realizing the method. The method is suitable for scientific research, teaching, health and environmental protection departments to measure the radioactive intensity of C-14 labeled methane samples. Background technique [0002] C-14-labeled plants have been widely used indoors to study the kinetics of plant residue organic carbon decomposition and transformation in soil. Methane is an important trace greenhouse gas in its transformation process, which is affected by ecological, environmental and global changes, etc. broad attention in the field of research. The precise determination of the radiation intensity of C-14 labeled methane is the basis of the above research. At present, the direct measurement of the radioactive intensity of C-14 labeled methane is usually followed by the addition of a tube-type counting detector after the gas c...

AI Technical Summary

Problems solved by technology

Usually, since methane is a trace gas, if C-14 labeled methane is oxidized to C-14 labeled CO 2 After that, absorb it with lye, then take part of the lye and add scintillation liquid to measure C-14 labeled CO with a liquid scintillation instrument. 2 The radiation intensity will cause the radioactivity to be too weak to be accurately measured

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