A measurement system and method for radon diffusion coefficient

Abstract

The invention discloses a radon diffusion coefficient measurement system and a measurement method. The measurement system comprises a hollow pipe, a radon source, a mesh partition, a plurality of gasvalves, and active carbon detectors; one end of the hollow pipe is sealed, the other end is opened, an openable sealing cover is arranged at the opening of the hollow pipe, the mesh partition is arranged in the hollow pipe, the radon source is placed on one side of the mesh partition and located at the sealed end of the hollow pipe, the plurality of gas valves are mounted in the axial direction onthe wall of the hollow pipe on the other side of the mesh partition, and each gas valve is connected to one active carbon detector. The structure of the measurement system is simple; by diffusing radon in medium in the round pipe, the diffusion and distribution of radon in the medium are detected at different position points, and a negative exponential function fitting method is adopted to calculate the diffusion coefficient of radon in the medium.

Description

technical field [0001] The invention relates to the technical field of radioactivity measurement, in particular to a measurement system and method for radon diffusion coefficient. Background technique [0002] Radon gas is a tracer, which can indicate underground mineral deposits, geological structures, earthquakes, etc. Therefore, radon gas measurement is widely used in mineral geology, hydrogeology, engineering geology, disaster geology, environmental geology, etc. The radioactivity of radon gas is harmful to human health. As a natural radiation, radon gas exists in major building decoration materials such as soil, brick, cement, and granite. It is considered to be the second most cancerous factor after smoking. The health organization has listed radon as one of the 19 most important substances that cause cancer. The diffusion coefficient of radon gas is a physical quantity that describes the migration ability of radon gas. It is an important parameter to determine the de...

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Problems solved by technology

[0003] At present, the radon diffusion coefficient is generally calculated by measuring the concentration change of radon gas before and after passing through the medium. The measurement of radon gas concentration generally requires continuous pumping, which causes gas convection (non-static) in the medium and affects the measurement results.

In addition, there are greater uncertainties and instabilities in calculating the diffusion system with only 2 measurements

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