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Radiation Protection Dosimetry Advance Access originally published online on January 12, 2006
Radiation Protection Dosimetry 2006 118(3):337-344; doi:10.1093/rpd/nci347
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Natural radionuclides in the rocks of the Valle del Cervo Pluton in Piedmont

Lucia Sesana1,*, Marco Fumagalli1, Mauro Carnevale1, Giancarla Polla1, Ugo Facchini1, Annita Colombo2, Annalisa Tunesi2, Luisa De Capitani3 and Rosella Rusconi4

1 Istituto di Fisica Generale Applicata, Università degli Studi di Milano, Via G. Celoria, 16-20133 Milano, Italy
2 Dipartimento di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano-Bicocca, Piazza della Scienza, 4-20126 Milano, Italy
3 Dipartimento di Scienze della Terra ‘A. Desio’, Università degli Studi di Milano, Via Botticelli, 23-20133 Milano, Italy
4 Dipartimento di Milano, ARPA Lombardia, Via Juvara 22-20129 Milano, Italy

* Corresponding author: lucia.sesana{at}unimi.it

Received May 24, 2005, amended July 12, 2005, accepted August 22, 2005

Monitoring of the gamma radiation in Valle del Cervo Pluton was performed by determining U and Th contents in the main rock types cropping out over the entire area and pertaining to the granitic complex, syenitic complex and monzonitic complex. In particular, syenitic rocks were largely used as building and ornamental materials (e.g. Sienite della Balma). All the samples are fresh and do not present joints or fractures filled with U minerals. In the crushed samples the activity of uranium varies from 346 to 764 Bq/kg. Concentration of thorium varies from 202 to 478 Bq/kg. For all the analysed rocks uranium activity is higher than thorium one. The lowest value of radioactive concentration is referred to rocks of the granitic complex. The most active rocks are syenites. The data confirm the high activities of Valle del Cervo rock types, strongly connected with high K content of the source magma (geochemical signature); on the contrary, the activity seems to be not related to the location of the samples.


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