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Title:
GAMMA DOSE RATES AT RONGELAP ATOLL, 1954-1963
Subject Terms:
SURVEYS; BRAVO EVENT; GRAPHS; RADIATION DETECTORS; THEORETICAL DATA; RADIATION MONITORING; REDWING PROJECT; GAMMA DETECTION; CASTLE OPERATION; HARDTACK I OPERATION; PHOTOGRAPHIC FILM DOSEMETERS; DOSE RATES
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 May 31
Declassification Status:
Never classified
Document Pages:
0020
Accession Number:
NV0067528
Document Number(s):
UWFL91
Originating Research Org.:
UNIVERSITY OF WASHINGTON, SEATTLE
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
RONGELAP ATOLL WAS CONTAMINATED WITH FALLOUT FROM A THERMONUCLEAR DEVI CE ON MARCH 1, 1954. GAMMA-DOSE RATES ON D + 1 RANGED FROM 3.5 R/HR TO 35 R/HR. UNTIL 1959 THE DECLINE OF GAMMA-DOSE RATES MEASURED IN THE F IELD FOLLOWED THE THEORETICAL DECAY OF MIXED FISSION PRODUCTS FROM URA NIUM-235 CALCULATED BY MILLER AND LOEB. THE REDUCTION OF GAMMA DOSE RA TES TO APPROXIMATELY HALF THE PREDICTED LEVELS IN 1959-63 PROBABLY REF LECTS THE DOWNWARD MOVEMENT OF THE LONG-LIVED GAMMA-EMITTER CESIUM-137 IN THE SOIL. REDISTRIBUTION OF FALLOUT HAD LITTLE EFFECT ON GAMMA DOSE RATES EXCEPT IN THE INTERTIDAL ZONE. IT IS CONCLUDED THAT PREDICTED G AMMA DOSE RATES FROM FALLOUT BASED ON THEORETICAL DECAY CURVE OF RADIO NUCLIDES FROM FISSION OF URANIUM-235 WOULD TEND TO BE EQUAL TO OR GREA TER THAN ACTUAL LEVELS.


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