Abstract
The detection system KATERINA has been used in the National Laboratory of Gran Sasso (close to L’ Aquila) in Italy for short term continuous monitoring of radon daughter concentrations in a groundwater path. The system was immersed in an water tank which was supplied with groundwater discharged from the mountain of Gran Sasso. The system offers quantitative results using calibration parameters obtained by reference sources and appropriate system efficiency simulation. Measurements were performed in two periods (December 2005 and November 2007) exhibiting almost constant radon level 2.8 Bq/l in the first period, while in the second period it increased up to 6.8 Bq/l. This gradual enhancement of radon background level could be attributed to the increase of microseismicity that occurred from late of 2007 till April 2009.
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