210Pb is widely used to determine accumulation rates in order to obtain a time scale in environmental samples. The most accurate method uses the determination of 210Pb via its grand-daughter 210Po by alpha spectrometry. Unfortunately this method requires a complex wet-chemistry procedure to achieve the separation of 210Po from its matrix. In this work a simplified procedure for the chemical separation of 210Po is proposed and applied to three marine sediment cores and a 10 m snow core collected in Antarctica. The calculated sedimentation rates for marine sediments range from 0.053 to 0.071 cm y-1. The mean annual accumulation rate for the snow is 16.6 cm y-1 w.e.. A comparison with literature data in the same region is given.
Bettoli, M.G., Cantelli, L., Quarin, D., Ravanelli, M., Tositti, L., Tubertini, O. (1998). Marine sediments and snow from ross sea region (Antarctica) dating by 210 Pb method. INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, 71(3-4), 321-330 [10.1080/03067319808032636].
Marine sediments and snow from ross sea region (Antarctica) dating by 210 Pb method
Bettoli M. G.;Cantelli Lorenzo;Tositti L.;Tubertini O.
1998
Abstract
210Pb is widely used to determine accumulation rates in order to obtain a time scale in environmental samples. The most accurate method uses the determination of 210Pb via its grand-daughter 210Po by alpha spectrometry. Unfortunately this method requires a complex wet-chemistry procedure to achieve the separation of 210Po from its matrix. In this work a simplified procedure for the chemical separation of 210Po is proposed and applied to three marine sediment cores and a 10 m snow core collected in Antarctica. The calculated sedimentation rates for marine sediments range from 0.053 to 0.071 cm y-1. The mean annual accumulation rate for the snow is 16.6 cm y-1 w.e.. A comparison with literature data in the same region is given.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
