Document Details


Title:
LETTER TO B W CHURCH, SUBJECT: ATTACHED PUBLICATION BY DRS. R C DAHLAM, C W FRANCIS AND T TAMURA " RADIOCESIUM CYCLING IN VEGETATION AND SOIL "
Author(s):
FORE, C S [OAK RIDGE NATIONAL LABORATORY]
Subject Terms:
SOILS; RESEARCH PROGRAMS; DEPOSITION; CLAYS; CORRELATIONS; ACTIVITY LEVELS; PLANTS; GRAPHS; ABSORPTION; UPTAKE; MILK; CESIUM 137; RADIONUCLIDE KINETICS
Addressee:
CHURCH B W
Document Location:
Location - DOE/NNSA NUCLEAR TESTING ARCHIVE Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - NTA@NV.DOE.GOV
Document Type:
CORRESPONDENCE, LETTERS, MEMOS
Publication Date:
1976 May 11
Declassification Status:
Never classified
Document Pages:
0022
Accession Number:
NV0067571
Originating Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OpenNet Entry Date:
1994 Aug 26
OpenNet Modified Date:
2003 Sep 18
Description/Abstract:
DATA ON CESIUM DYNAMICS IN VEGETATION AND SOILS ARE REVIEWED. SPECIAL EMPHASIS IS PLACED ON TYPICAL ENVIRONMENTS IN THE SOUTHEASTERN UNITED STATES. CLAY MINERALS OF SOIL, ESPECIALLY MICACEOUS TYPES, EFFECTIVELY FIX CESIUM AND REMOVE IT FROM BIOTIC COMPONENTS OF ECOSYSTEMS. FALLOU T CESIUM-137 ENTERS FOOD CHAINS PRINCIPALLY BY DIRECT DEPOSITION ON VE GETATION; UPTAKE BY THE ROOT PATHWAY IS USUALLY LESS THAN DIRECT CONTA MINATION OF PLANT FOLIAGE. CESIUM-137 LEVELS IN VEGETATION OF THE SOUT HEASTERN U.S. COASTAL PLAIN ARE ESTIMATED ON THE BASIS OF DIRECT DEPOS ITION FROM THE ATMOSPHERE AND ROOT UPTAKE FROM SOIL. ESTIMATED CONCENT RATIONS, BASED ON CURRENT CONCEPTS OF CESIUM-137 DYNAMICS IN VEGETATIO N AND FIXATION IN SOIL, ARE IN GOOD AGREEMENT WITH OBSERVED VALUES OF CESIUM IN VEGETATION COLLECTED IN 1969 AND 1970. MECHANISMS OF DIRECT DEPOSITION AND OF INCREASED UPTAKE BY ROOTS DUE TO THE ABSENCE OF MICA CEOUS CLAYS ADEQUATELY EXPLAIN THE HIGHER LEVELS OF CESIUM-137 IN VEGE TATION OF THE COASTAL PLAIN AND THUS ARE RESPONSIBLE FOR THE ELEVATED CESIUM REPORTED FOR MILK OF THE TAMPA, FLA, MILKSHED.


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