Explore the precipitation amount of radon in granite under uniaxial pressure

Background: For a long time, many scholars both at home and abroad have been engaged in radon monitoring for seismic forecast. Purpose: This paper deals with the relationship between uniaxial stress and rock radon exhalation, and wants to provide the basis of earthquake prediction by using the change of radon concentration. Methods: The uniaxial force applied on the granite sample is carried out using rock triaxial creep testing machine. The total accumulative measurement for sample radon emanation under different uniaxial pressure is performed using CR-39 solid track detector. Results: When the sample in the initial consolidation and elastic deformation stage, the radon emanation quantity with decreased the increase of the pressure. Granite samples' biggest axial displacement positively correlated to the uniaxial tension applied on them. With the development of time, the 'native' fissure of sample is compressed tighter by degrees, lead to the smaller amounts of radon exhalation in fracture. Conclusions: This article provides some experimental reference for the negative anomalies circumstances of radon before earthquake. (authors)