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Gross alpha- and beta-activities in surface and ground water of Rio Grande do Norte, Brazil by Alberto Malanca; Milena Repetti; Harim Revorêdo de Macêdo is a Physics and Astronomy article available to read on EtoBox.

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Gross c~-and Ig-activities were determined on 37 fresh water samples collected from 14 artificial basins, 13 deep drilled wells, two dug wells, two lakes, two rivers, one spring, and a tap belonging to 30 locations scattered throughout the eastern and central parts of the Brazilian state of Rio Grande do Norte. The surveyed area was about 35 000 km 2 with a lithology including both crystalline (18 towns) and sedimentary (12 towns) rocks. Concentrations ranging from < 2.8 to 354 Bq m-3 and from 50.5 to 580 Bq m -3 were observed for the gross ~-and 13-activities, respectively. For the gross 13-activity, which was always higher than the corresponding s-activity, the arithmetic mean with its standard deviation was 226 + 154 Bq m-3. In order to evaluate the radioactive dose due to the ingestion of these waters, a conservative dosimetric calculation was carried out using the dose conversion factors suggested by the ICRP. An average annual effective dose equivalent of 60 \_\_\_ 42 gSV was obtained together with a range of 14-161 gSv y-'.

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Author

Alberto Malanca; Milena Repetti; Harim Revorêdo de Macêdo

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0969-8043)

Published

1998

Language

EN

Field

Physics and Astronomy (Physical Sciences)