Plutonium and americium concentrations and vertical profiles in some Italian mosses used as bioindicators |
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Authors: | C. Testa S. Degetto G. Jia R. Gerdol D. Desideri M. A. Meli F. Guerra |
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Affiliation: | (1) Urbino University, Piazza Rinascimento 6, 61029 Urbino, Italy;(2) ICTIMA CNR, Padua, Italy;(3) Institute of Atomic Energy, Beijing, P. R. China;(4) Ferrara University, Ferrara, Italy |
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Abstract: | We have examined the uptake of actinide elements Am and, Pu by different species of lichen and moss collected in two locations (Urbino, Central Italy; Alps region, North-east Italy). Plutonium and americium were separated and determined by extraction chromatography, electrodeposition and alpha-spectrometry. This paper summarizes our results with a special emphasis on the vertical profiles of these actinides in two different species of mosses. Several 1–2 cm depth sections were obtained and dated by210Pb method. A typical peak for239,240Pu and241Am was found in the very old moss species (“Sphagnum Compactum”) at a depth corresponding to the period 1960–1970 which was the period characterized by the maximum nuclear weapon tests. In a younger moss species (“Neckeria Crispa”) no peak was observed and the regression curves showed that Am is more mobile than239,240Pu and238Pu. |
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