Continuous type automatic measurement method and apparatus for radon in water

Abstract

The invention discloses continuous type automatic measurement method and apparatus for radon in water. In the invention, it is proved that radon gas exchanges between gas phase and liquid phase and satisfies Henry's Law, namely, dissolution equilibrium state; and the concentration of radon in water can be calculated by an equation of Cw = F*Cg; meanwhile, the invention provides experiment measurement steps of water temperature T relative to the equilibrium factor F. The measurement apparatus includes: a water filter unit, a gas-water exchanger unit, a water vapor condenser unit, and a radon detector unit. The measurement apparatus has simple operation, is high in intelligent degree, has digital measurement function, saves manpower and drying agent, can continuously measure the concentration of radon in water for a long period, is more complete, stable and accurate in measurement data of the radon in water, and can supply a more reliable digital measurement result for the radon in waterto observation of geologic structure and earthquake precursor.

Description

technical field [0001] The invention relates to a water radon measuring method, in particular to a continuous water radon automatic measuring method and device. Background technique [0002] Radon gas is the decay product of radium in the three natural radioactive systems, and is a colorless, odorless, radioactive, inert gas. Radon gas is soluble in water and widely distributed in groundwater. Because radon gas has unique physical and chemical properties and strong earthquake reflection, it occupies an important position in the observation of underground fluids in the seismic industry. Water radon observation can most intuitively capture the change of water radon concentration in groundwater, and then provide a theoretical basis for the study of earthquake precursors. [0003] Water radon measurement methods include liquid scintillation counting method, scintillation chamber method, gamma energy spectroscopy, alpha energy spectroscopy, etc. [0004] Gamma energy spectrosc...

AI Technical Summary

Problems solved by technology

Although this method has high sensitivity and accurate results, it is complicated to operate, inconvenient to measure on-site, easy to pollute or leak air in the scintillation vial, and obtains little water radon observation data every day.

[0008] In the existing water radon measurement technology, there are mainly the following problems in the field of earthquake precursor water radon observation: one, it is a continuous automatic measurement problem

The current water radon measurement method in the earthquake department is the scintillation chamber method of manually collecting water samples and bubbling. The daily measurement data is small and cannot meet the analysis requirements of observation data.

Second, it is the problem of measurement accuracy

The current scintillation chamber method of manually collecting water samples and bubbling in the seismic department cannot completely separate the radon gas in the water when there is bubbling, and the uncertainty of the water radon results caused by different personnel operations is relatively large

The existing degassing device used for radon separation in water cannot maintain a stable degassing state, which affects the collection and concentration calculation of radon

3. Applicability

Water radon measurement for earthquake precursor observation is mostly at monitoring points far away from the office, and liquid scintillation counting method, scintillation chamber method, gamma energy spectroscopy, and alpha energy spectroscopy cannot be carried out

The flow state of groundwater in fluid observation wells is different, divided into artesian wells and static water level observation wells, and the flow rate of groundwater is also different and unstable, which brings difficulties to water radon measurement

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