Relation between "terra rossa" from the Apulia aquifer of Italy and the radon content of groundwater: Experimental results and their applicability to radon occurrence in the aquifer |
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| Authors: | T Tadolini M Spizzico |
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| Institution: | (1) Institute of Engineering Geology and Geotechnology, Engineering Faculty, Technical University of Bari, E. Orabona str. no. 4, I-70125 Bari, Italy Fax: +39-80-546-0675, e-mail: tadolini@deecom04.poliba.it, IT |
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| Abstract: | The radon-222 (222Rn) activity in groundwater of the Apulian karstic aquifer in southern Italy is as great as 500 Becquerel per liter (Bq/L)
locally. Normal radium-226 (226Ra) activity in the limestone and calcareous dolomites of the aquifer is not enough to explain such a high level. Laboratory
investigations identified high 226Ra activity in the "terra rossa," the residuum occupying fissures and cavities in the bedrock, and also the relation between
(1) 226Ra-bearing bedrock and "terra rossa" and (2) 222Rn in water. The "terra rossa" is the primary source of the radon in the groundwater. The experimental results show the need
to characterize the "terra rossa" of Apulia on the basis of 226Ra activity and also to study the distribution and variations in 222Rn activity over time in the aquifer.
Received, January 1996 · Revised, March 1997, September 1997, June 1998 · Accepted, July 1998 |
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| Keywords: | karst radon laboratory experiments Italy |
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