Document Details


Title:
ATOLL SOIL TYPES IN RELATION TO THE DISTRIBUTION OF FALLOUT RADIONUCLIDES ( U-WASH VERSION ) ( DUP OF 45024 )
Subject Terms:
SOILS; RADIOISOTOPES; CESIUM 137; ANTIMONY 125; STRONTIUM 90; ZINC 65; GAMMA RADIATION; AUTORADIOGRAPHY; GAMMA SPECTROSCOPY; SPECTROSCOPY
Document Location:
Location - NNSA/NSO 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 - CIC@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1965 Aug 31
Declassification Status:
Unknown
Document Pages:
0045
Accession Number:
NV0004020
Document Number(s):
UWFL92
Originating Research Org.:
U WASH
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
THE REDISTRIBUTION OF RADIONUCLIDES IN ATOLL SOILS FOLLOWING FALLOUT F ROM A NUCLEAR DEVICE IS DESCRIBED. THE SOILS ARE CALCAREOUS, CONTAININ G NO INORGANIC COLLOIDS, AND THEIR EXCHANGE CAPACITY IS DIRECTLY RELAT ED TO ORGANIC CONTENT. COMPARISON OF GAMMA-RAY SPECTRA OF DEPTH INCREM ENTS FROM YOUNG AND OLD SOILS SHOWS THAT SC-137 AND SB-125 MOVE MOST R EADILY IN OLD SOIL, WHILE THE PRINCIPAL GAMMA-EMITTING RADIONUCLIDE MO VING IN YOUNG SOIL IS SB-125. SR-90 MOVES IN BOTH OLD AND NEW SOILS, A ND QUANTITATIVE DIFFERENCES IN VERTICAL MOVEMENT BETWEEN SOIL TYPES IS OBSCURED BY THE HIGHLY VARIABLE SURFACE DISTRIBUTION OF THE RADIONUCL IDES. THERE IS A VERTICAL GRADIENT IN THE DISTRIBUTION OF RADIONUCLIDE S EVEN WITH IN THE SURFACE INCH. LITTER REDEPOSITS CS-137 AND SR-90 AT THE SOIL SURFACE AND BIRD DROPPINGS HAVE ADDED ZN-65 AND CO-60. IN YO UNGSOILS THE HIGHEST LEVELS OF RADIOACTIVITY ARE ASSOCIATED WITH SOIL ALGAE FOUND AS A SURFACE CRUST IN UNDISTURBED AREAS AND IN CORAL FRAG MENTS IN ERODED AREAS. HORIZONTAL MOVEMENT IS LOCALIZED AND PROBABLE I S OF LITTLE OVERALL IMPORTANCE. BURIED ORGANIC HORIZONS CONTAIN MORE C S-137 THAN ADJACENT SOIL LAYERS, AND ROOTS ARE GENERALLY MORE RADIOACT IVE THAN SURROUNDING SOIL EXCEPT AT THE SOIL SURFACE. PUMICE PARTICLES IN THE SOIL ABSORB RADIONUCLIDES BUT PUMICE IS FOUND INFREQUENTLY. ME CHNICAL MIXING BY ANIMALS IN OLD SOILS AND BY EROSION IN YOUNG SOILS.


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