Computer Science
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93..345d&link_type=abstract
Earth and Planetary Science Letters, Volume 93, Issue 3-4, p. 345-358.
Computer Science
11
Scientific paper
The activities of two short-lived natural radionuclides, 234Th and 7Be, were measured in Lake Geneva water, suspended solids and sediments, in order to obtain their removal residence times in the lake. Four independent methods of estimation are presented and compared. The calcuated residence times of 234Th and 7Be vary from 60 to 280 days and from 60 to 1100 days, respectively, depending on season and the method used. In general, 7Be residence times are significantly longer than those of 234Th. For both nuclides the removal residence times are significantly longer than their respective radioactive mean-lives. As a consequence, the estimates based on their water column inventories are not as reliable as the estimates obtained from the measured fluxes of these nuclides into sediment traps. Estimates based on the bottom sediment inventories are similar in magnitude to those obtained from flux into sediment traps, but occasionally are erroneous because of small-scale sediment heterogeneity.
Present addresses: Department of Marine Science, Texas A&M University at Galveston, Galveston, TX 77553-1675, U.S.A.
Dominik J.
Santschi Peter H.
Schuler Ch.
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