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Title:
OPERATION CASTLE - PROJECT 2.6A, CHEMICAL, PHYSICAL, AND RADIOCHEMICAL CHARACTERISTICS OF THE CONTAMINANT (DELETED)
Subject Terms:
CASTLE OPERATION; CONTAMINATION; FALLOUT; FISSION PRODUCTS; RADIOISOTOPES; SURFACE WATERS; SAMPLING; FALLOUT COLLECTORS; AIR SAMPLERS; AEROSOL MONITORING; IODINE; NEPTUNIUM
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:
1955 Sep 30
Declassification Status:
Sanitized
Document Pages:
0152
Accession Number:
NV0015434
Document Number(s):
WT917EX
Originating Research Org.:
ARMED FORCES SPECIAL WEAPONS PROJECT
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
THE BOMB DEBRIS FROM SURFACE, LAND AND WATER SHOTS AT OPERATION CASTLE WAS STUDIED TO DETERMINE THE PHYSICAL, CHEMICAL, AND RADIOCHEMICAL CHA RACTERISTICS. THE FALLOUT FROM THE SURFACE LAND SHOTS CONSISTED CHIEFL Y OF IRREGULAR WHITE PARTICLES 25 MICRO TO 2 MM IN DIAMETER. THEY WERE DERIVED FROM CORAL AND HAD THE RADIOACTIVITY CONCENTRATED NEAR THEIR S URFACES. ABOUT 5 PER CENT OF THE ACTIVITY IN THE SOLID FALLOUT WAS WAT ER SOLUBLE; 95 PER CENT DISSOLVED IN DILUTE ACETIC ACID. THE FALLOUT F ROM THE SURFACE WATER SHOTS WAS INVISIBLE BOTH IN THE AIR AND AFTER IT HAD DEPOSITED. IT WAS COLLECTED ON SPECIAL FILTERS AND ON A FILM BY EL ECTROSTATIC PRECIPITATION. THE FILTERS AND FILM AND THEIR AUTORADIOGRA PHS WERE STUDIED MICROSCOPICALLY. THESE STUDIES SHOWED THAT THE FALLOU T CONSISTED OF MICROSCOPIC SOLID CRYSTALS AND SMALL DROPLETS. THE AUTO RADIOGRAPHS INDICATED THE PRESENCE ON THE FILTERS OF MANY PARTICLES WH ICH WERE INVISIBLE UNDER THE MICROSCOPE. THE MAJOR PART OF THE RADIOAC TIVITY WAS ASSOCIATED WITH CRYSTALLINE AGGREGATES AND DROPLETS UP TO A BOUT 2 MM IN DIAMETER. WATER DISSOLVED FROM 60 TO 90 PER CENT OF THE R ADIONUCLIDES FROM THIS TYPE OF FALLOUT. FALLOUT AND CLOUD SAMPLES FROM LAND AND WATER SHOTS WERE ANALYZED CHEMICALLY FOR MAJOR CONSTITUENTS A ND TRACE ELEMENTS INCLUDING MANY OF THE RADIONUCLIDES. CORAL AND SEA W ATER CONTRIBUTED THE MAJOR CONSTITUENTS, BOMB PRODUCTS BEING PRESENT I N TRACE CONCENTRATIONS. RADIOCHEMICAL ANALYSIS SHOWED THE VALLEY OF TH E FISSION PRODUCT YIELD CURVE WAS ABOUT 20 TIMES HIGHER AND THE HEAVY WING AT MASS 156 ABOUT 6 TIMES HIGHER THAN THE YIELD CURVE FROM THERMA L NEUTRONS ON U-235. THE IMPORTANT INDUCED RADIONUCLIDES WERE U-239, U-237, AND U-240. THE PRESENCE OF THESE HAD A MARKED EFFECT ON THE DECAY CURVES AND ENERGY SPECTRA ESPECIALLY AT INTERMEDIATE TIMES AFTER DETINATION. THE NEPTUNIUM WAS DISTRIBUTED BETWEEN OXIDATION STATES; IODINE OCCURRED PRINCIPALLY AS IODIDE. THE INFORMATION OBTAINED FROM THESE STUDIES HAS AIDED IN (A) AN UNDERSTANDING OF THE MECHANISM OF FORMATION OF THE FALLOUT, (B) ASSESSING THE RADIOLOGICAL SITUATION IN FALLOUT AREAS, (C) SYNTHESIZING SIMULANTS FOR LABORATORY STUDIES, AND (D) INTERPRETING DATA OBTAINED IN PROOF TESTS OF COUNTERMEASURES FOR SHIPS. THIS DOCUMENT IS A DELETED VERSION.


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