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Titolo:
Ra-226 and Ra-228 activities associated with agricultural drainage ponds and wetland ponds in the Kankakee Watershed, Illinois-Indiana, USA
Autore:
Sidle, WC; Shanklin, D; Lee, PY; Roose, DL;
Indirizzi:
United States Environm Protect Agcy, Isotope Hydrol Lab, Cincinnati, OH 45224 USA United States Environm Protect Agcy Cincinnati OH USA 45224 OH 45224 USA Fluor Daniel Corp, Fernald Environm Management Project, Cincinnati, OH 45239 USA Fluor Daniel Corp Cincinnati OH USA 45239 oject, Cincinnati, OH 45239 USA Groundwater Res Co, Oxford, OH 45056 USA Groundwater Res Co Oxford OH USA45056 water Res Co, Oxford, OH 45056 USA
Titolo Testata:
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
fascicolo: 1, volume: 55, anno: 2001,
pagine: 29 - 46
SICI:
0265-931X(2001)55:1<29:RARAAW>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISEQUILIBRIUM; SEDIMENTS; OCEAN;
Keywords:
radium; isotope; fertilizer; watershed;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Sidle, WC United States Environm Protect Agcy, Isotope Hydrol Lab, 5995 CtHill Ave,Cincinnati, OH 45224 USA United States Environm Protect Agcy 5995Ct Hill Ave Cincinnati OH USA 45224
Citazione:
W.C. Sidle et al., "Ra-226 and Ra-228 activities associated with agricultural drainage ponds and wetland ponds in the Kankakee Watershed, Illinois-Indiana, USA", J ENV RAD, 55(1), 2001, pp. 29-46

Abstract

Background radioactivity is elevated in many agricultural drainage ponds and also constructed wetland ponds in the Kankakee watershed. During 1995-1999, gross-alpha and -beta activities were measured up to 455 and 1650 mBq L-1. respectively. Ra-226 and Ra-228 averaged 139 and 192 mBq L-1 in controlled drainage ponds compared to 53 and 58 mBq L-1 for Ra-226 and Ra-228, respectively, in native wetland ponds. Analyses of applied ammonium phosphate fertilizers near both native and controlled ponds indicate comparable Ra-226/Ra-228 and Ra-228/Th-232 activity ratios with only the surface waters in the controlled ponds. For example, Ra-226/ Ra-228 activity ratios in controlled ponds ranged from 0.791 to 0.91 and group with a local fertilizer batch containing FL phosphate compounds with Ra-226/Ra-228 activity ratios of 0.831-1.04, Local soils of the Kankakee watershed have Ra-226/Ra-228 activity ratios of 0.541-0.70. Calculated Ra fluxes of waters, in drainage ditchesassociated with these controlled ponds, for Ra-226 ranged from 0.77 to 9.00 mBq cm(-2) d(-1) and for Ra-228 ranged from 1.22 to 8.43 mBq cm(-2) d(-1). Ra activity gradients were measured beneath these controlled ponds both in agricultural landscapes and in constructed wetlands, all being associatedwith drainage ditches. Ra had infiltrated to the local water table but wasbelow regulatory maximum contaminant limits. Still, measurable Ra activitywas measured downgradient of even the constructed wetlands in the Kankakeewatershed, suggesting that the attenuation of Ra was low. However, no Ra excess was observed in the riparian zone or the Kankakee River downgradient of the native wetland ponds. Published by Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 02:39:39