Underground water radioactive inert gas nuclide dating sampling system and sampling method thereof

Abstract

The invention relates to an underground water radioactive inert gas nuclide dating sampling system and a sampling method thereof. The system comprises a filter, a sampling bottle, a flowmeter, a gas-water separator, a hollow fiber membrane contactor, a vacuum pump and a compression pump. The sampling process comprises the steps of (1) making sampling preparations: connecting the sampling bottle, awater inlet pipeline, a water outlet pipeline and a ventilation pipeline, closing all pipeline valves, and draining water; (2) carrying out leak detection: vacuumizing the system, and observing inletand outlet pressure meters of the compression pump for 2-5 minutes to judge whether a pressure change exists or not; (3) carrying out sampling: deflating or inflating the sampling bottle by valve opening or closing, cleaning the sampling bottle for three continuous times, and inflating the cleaned sampling bottle to carry out sampling; and (4) carrying out disposal after sampling: taking down thewater inlet pipeline and the water outlet pipeline, discharging remained water in the system, and drying the system. The underground water radioactive inert gas nuclide dating sampling system and thesampling process are optimized, so that the atmospheric inert gas pollution is effectively controlled, and the sampling efficiency and the representativeness of a sample are improved.

Description

technical field [0001] The invention belongs to the technical field of geological sample sampling and analysis, and relates to a radioactive inert gas nuclide dating sampling system for underground water and a sampling method thereof. Background technique [0002] Radionuclides are nature's natural clock. When the sample is separated from the atmospheric environment, the abundance of the radioactive tracer nuclide decays exponentially from a known initial value with time, so the geological age of the sample can be obtained according to its abundance, so as to understand the environmental sample Basic information on migration or evolution processes is widely used in earth and environmental sciences. Radioactive noble gas nuclides are ideal tracer nuclides for dating samples of environmental water (groundwater, glaciers, and ocean water). 98% of the noble gas nuclides exist in the atmosphere and stay in the atmosphere for a long time, so the distribution is uniform all over ...

AI Technical Summary

Problems solved by technology

[0003] Since groundwater often degasses due to pressure changes after it is exposed to the surface, and inert gases in the atmosphere may cause sample contamination, sampling has become a key technology that is difficult to master and often related to the success of the work. It is difficult to meet the accuracy requirements of groundwater radioactive noble gas nuclide dating

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