Radon content in groundwaters drawn from the metamorphic basement, eastern Sao Paulo State, Brazil

被引：7

作者：

Lucas, Fabio de Oliveira ^{[1
]}

Ribeiro, Fernando Brenha ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfericas, Dept Geofis, BR-05508090 Sao Paulo, Brazil

来源：

RADIATION MEASUREMENTS | 2007年 / 42卷 / 10期

基金：

巴西圣保罗研究基金会;

关键词：

radon; groundwater; natural radioactivity;

D O I：

10.1016/j.radmeas.2007.06.005

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The Rn-222 activity concentration was measured in groundwaters drawn from three wells drilled in different rocks of the metamorphic basement exposed at eastern Sao Paulo State, southeastern Brazil. The first well cuts a K-feldspar bearing granite, the second well cuts a granite-gneiss and the third well cuts a gneiss. The groundwater samples were collected between July 2005 and August 2006 with a time interval of about one month between sampling campaigns. The year-long mean activity concentrations were (76 +/- 7) Bq/dm(3) for the first well, (26 +/- 3) Bq/dm(3) for the second well and (39 +/- 4) Bq/dm(3) for the third one. The activity concentrations show a time-dependent variability that is interpreted as a consequence of rainfall seasonal variations. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1703 / 1714

页数：12

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