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VARIATIONS IN THE VOLUME ACTIVITY OF RADON IN SAMPLES OF GRANITE AND CLAY WITH A TEMPERATURE CHANGE OF TO 400 - C
Abstract
The study of the variations in the volume activity of radon-222 under natural conditions attests to their association with changes in porosity and permeability due to the stressstrain state of rocks. In most cases, the observed changes in the volume activity of radon in time are explained by lunar-solar tides, meteorological conditions, and a number of other factors. However, it is difficult to explain the observed relationship between the variations in volumetric activity of radon and tectonic events remote to many hundreds of kilometers from their registration sites. One of the assumptions is the receipt of "additional" radon from the remote reservoir along the permeable channels (cracks) formed or its release, due to the desorption process, into the pore space near the detector. To confirm this assumption, experimental studies were carried out to study variations in the volume activity of radon in rock samples with a change in their temperature in the range 20-400 пїЅ ?. To carry out the experiments, a laboratory installation was developed that allows measurements of the volume activity of radon when samples are heated to 400 пїЅ C. A feature of the installation is the ability to conduct continuous measurements in a circulating (closed) circuit. A series of experiments carried out with samples of granite screening, wet and dry clays revealed the regularity of increasing several times the level of volumetric activity of radon upon heating. When the samples cool down, the level of volumetric radon activity decreases to background values. The carried out researches testify that at heating "additional" radon which can be adsorbed on surfaces of pores and cracks or is dissolved in pore liquid is allocated. A increase and decrease in the level of volumetric activity of radon in a circulating (closed) scheme confirms the process of sorption-desorption of radon from the surface of rock samples.
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