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Titolo:
DEPOSITION OF PB-210 CS-137 PU-239-238 AND AM-241 IN THE ANTARCTIC PENINSULA AREA(240 PU)
Autore:
ROOS P; HOLM E; PERSSON RBR; AARKROG A; NIELSEN SP;
Indirizzi:
LUND UNIV,DEPT RADIAT PHYS S-22185 LUND SWEDEN
Titolo Testata:
Journal of environmental radioactivity
fascicolo: 3, volume: 24, anno: 1994,
pagine: 235 - 251
SICI:
0265-931X(1994)24:3<235:DOPCPA>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
P. Roos et al., "DEPOSITION OF PB-210 CS-137 PU-239-238 AND AM-241 IN THE ANTARCTIC PENINSULA AREA(240 PU)", Journal of environmental radioactivity, 24(3), 1994, pp. 235-251

Abstract

Pb-210, Cs-137, Pu-239+240, Pu-238, and Am-241 were analysed in lichen, moss, grass and soil samples, as well as in lake sediments, from the South Shetland Islands, the Antarctic, in order to evaluate the fluxand deposition of these elements. Average inventories of the analysedradionuclides in 1988 were Pb-210 (excess): 280 +/- 110 Bq m-2 (n = 15), Cs-137: 155 +/- 95 Bq m-2 (n = 19), Pu-239+240: 4.6 +/- 2.6 Bq m-2(n = 19), Pu-238: 0.95 +/- 0.5 Bq m-2 (n = 19) and Am-241: 1.6 +/- 1.0 Bq m-2 (n = 19). From the maximum value of unsupported Pb-210 the annual deposition is determined to be 18 +/- 5 Bq m-2. The ratios Pu-238/Pu-239+240 and Am-241/Pu-239+240 of 0.21 +/- 0.04 and 0.35 +/- 0.08 respectively agree well with expected values in this area. A significant difference in Cs-137/Pu-239+240 ratios between lichens and moss/grass/soil is observed which may be an effect of submerging and melt wateraltering radionuclide ratios. From one of three lakes studied it is possible to perform Pb-210 dating with reasonably accuracy showing an average annual sediment accumulation in this lake of about 45 g m-2.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 18:38:06