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High time resolution monitoring of radon, using alpha detectors is carried out in a massive and jointed syenite located in arid southern Israel. Monitoring, at a resolution of 15‐min, is conducted in two boreholes at depths of 1.2 and 85–90 m, resulting in more then 10‐yr long time‐series. Systematic temporal variation patterns, manifesting large relative signals are composed primarily of annual (AR),...
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