Document Details


Title:
OPERATION HARDTACK-PROJECT 2.8: FALLOUT MEASUREMENTS BY AIRCRAFT AND ROCKET SAMPLING (DELETED)
Author(s):
WHITCHER, S L [UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATORY]; BUNNEY, L R [UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATORY]; SOULE, R R [UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATORY]; DAROZA, R A [LAWRENCE RADIATION LABORATORY, U. OF CA]
Subject Terms:
GLOBAL FALLOUT; MEASURING METHODS; AERIAL MONITORING; AEROSOL MONITORING; STRONTIUM 90; CESIUM 137; KOA EVENT; WALNUT EVENT; OAK EVENT; RADIOACTIVE CLOUDS; SAMPLING; RADIONUCLIDE KINETICS
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:
1961 Sep 29
Declassification Status:
Sanitized
Document Pages:
0084
Accession Number:
NV0051040
Document Number(s):
WT1625EX
Originating Research Org.:
UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATOR
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
THE GENERAL OBJECTIVE WAS TO ESTIMATE, FROM ANALYTICAL DATA ON CLOUD S AMPLES, THE RELATIVE DISTRIBUTION OF CERTAIN RADIONUCLIDES BETWEEN THE LOCAL AND WORLDWIDE FALLOUT FORMED BY MEGATON-RANGE DETONATIONS ON LA ND AND WATER SURFACES, WITH PARTICULAR EMPHASIS ON THE DISTRIBUTION OF STRONTIUM 90 AND CESIUM 137 BETWEEN LOCAL AND WORLDWIDE FALLOUT. IT WAS PLANNED TO ACHIEVE THESE OBJECTIVES BY RADIOCHEMICAL ANALYSES AND PARTICLE SIZE MEASUREMENTS ON THE FOLLOWING TYPES OF SAMPLES: (1) PART ICLES AND RADIOACTIVE GASES PRESENT IN THE UPPER PORTIONS OF THE CLOUD S TO BE COLLECTED BY HIGH-FLYING AIRCRAFT, (2) PARTICULATE MATTER IN T HE CLOUDS TO BE COLLECTED ALONG NEARLY VERTICAL FLIGHT PATHS, AT SEVER AL DIFFERENT DISTANCES FROM THE CLOUD AXIS, BY ROCKET-PROPELLED SAMPLI NG DEVICES, AND (3) FALLOUT TO BE COLLECTED AT AN ALTITUDE OF 1000 FEE T BY LOW-FLYING AIRCRAFT. THE PROJECT PARTICIPATED IN A 1.31-MT SHOT (KOA) FIRED OVER A CORAL ISLAND, A SHOT (WALNUT) FIRED FROM A BARGE IN DEEP WATER AND A 9-MT SHOT (OAK) FIRED OVER A CORAL REEF IN SHALLO W WATER, THE AIRCRAFT SAMPLING PROGRAM WAS GENERALLY SUCCESSFUL, AND FAIRLY COMPLETE SETS OF BOTH CLOUD AND FALLOUT SAMPLES WERE COLLECTED ON EACH SHOT. THE ROCKET PROGRAM WAS UNSUCCESSFUL BECAUSE OF A VARIET Y OF EQUIPMENT MALFUNCTIONS. THE GAS SAMPLES WERE ANALYZED FOR RADIOA CTIVE KRYPTON, AND THE CLOUD AND FALLOUT SAMPLES WERE EACH ANALYZED FO R STRONTIUM 90, CESIUM 137, AND SEVERAL OTHER NUCLIDES TO GIVE INFORMA TION ON FRACTIONATION. FALL RATE AND SIZE DISTRIBUTION MEASUREMENTS W ERE MADE ON THE PARTICLE SAMPLES FROM THE LAND-SURFACE SHOT. THE COMB INED ANALYTICAL DATA WAS USED TO ESTIMATE THE DISTRIBUTION OF STRONTIU M 90 AND CESIUM 137 BETWEEN THE LOCAL AND LONG-RANGE FALLOUT. THERE A RE NO RESULTS TO BE REPORTED ON THE SPATIAL DISTRIBUTION OF RADIOACTIV ITY IN THE CLOUDS, BECAUSE THIS PART OF THE PROJECT WAS DEPENDENT ON T HE ROCKET SAMPLES. THE RESULTS FROM SHOT KOA INDICATE THAT, IF THE CL OUD LAYERS SAMPLED WERE REPRESENTATIVE OF THEIR RESPECTIVE CLOUDS, ABO UT ONE-FIFTH OF THE STRONTIUM 90 AND ABOUT TWO-THIRDS OF THE CESIUM 13 7 PRODUCED WERE DISPERSED OVER DISTANCES GREATER THAN 4,000 MILES. CO RRESPONDING FRACTIONS FOR WALNUT WERE ABOUT ONE-THIRD FOR EACH OF THE TWO NUCLIDES. FOR OAK, THE FRACTIONS WERE ABOUT ONE-THIRD AND ONE-HAL F, RESPECTIVELY. RADIONUCLIDE FRACTIONATION WAS PRONOUNCED IN KOA AND OAK, I.E., THE RADIONUCLIDE COMPOSITION IN THE CLOUDS VARIED WITH ALT ITUDE. THE LOCAL FALLOUT WAS DEPLETED, AND THE UPPER PORTIONS OF THE CLOUD WERE ENRICHED IN BOTH STRONTIUM 90 AND CESIUM 137. FRACTIONATIO N WAS MUCH LESS EVIDENT IN WALNUT, THE WATER-SURFACE SHOT.


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