Document Details


Title:
FALLOUT FROM HIGH EXPLOSIVE DEVICES CONTAINING URANIUM 238 RESEARCH AND DEVELOPMENT TECHNICAL REPORT USNRDL-TR-368 18 SEPTEMBER 1959
Author(s):
CHAN, H K [UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATORY]
Subject Terms:
URANIUM 238; FALLOUT; PARTICLE SIZE; ALUMINIUM; BARIUM; IRON; AERIAL MONITORING; CLOUDS; AUTORADIOGRAPHY; PARTICLE IDENTIFICATION; PROCEDURES; CALCIUM; COPPER; MAGNESIUM; SILICON; QUANTITATIVE CHEMICAL ANALYSIS; FALLOUT TRAJECTORIES; GRAPHS; DATA; ZONES; METEOROLOGICAL DATA
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:
1959 Sep 18
Declassification Status:
Unknown
Document Pages:
0050
Accession Number:
NV0060331
Originating Research Org.:
UNITED STATES NAVAL RADIOLOGICAL DEFENSE LABORATOR
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
THE NATURE AND SIZE OF FALLOUT PARTICLES PRODUCED BY THE DETONATION OF DEVICES CONTAINING HIGH EXPLOSIVES AND URANIUM-238 WERE STUDIED. ANA LYSES SHOWED THAT URANIUM 238, ALUMINUM, BARIUM AND IRON WERE THE MAJO R ELEMENTS PRESENT IN THE FOUR CLOUD SAMPLES STUDIED; THE AMOUNTS OF T HESE ELEMENTS IN EACH SAMPLE WERE DETERMINED. A FILTER PAPER OXIDATIO N TECHNIQUE AND A SPECIAL WASHING TECHNIQUE WERE EMPLOYED TO RECOVER T HE PARTICLES FROM THE CLOUD SAMPLES. TWO MAJOR TYPES OF PARTICLES WER E COLECTED. ONE TYPE, WHICH COMPRISED 35-50 PERCENT OF THE PARTICLES, WAS BLACK, OPAQUE AND SPHEROIDAL IN SHAPE. THE OTHER TYPE WAS TRANSP ARENT, SPHERICAL AND EITHER COLORLESS OR BROWN OR GREEN IN COLOR. RADIOAUTOGRAPHIC STUDIES SHOWED THAT BOTH TYPES EMIT ALPHA TRACKS; HOW EVER, THE BLACK PARTICLES WERE MUCH MORE RADIOACTIVE. EXAMINATION OF DENSITY SEPARATED PARTICLE FRACTIONS INDICATE THAT THE BLACK PARTICLES WERE RELATIVELY RICH IN URANIUM-238 WHILE THE TRANSPARENT PARTICLES W ERE RICH IN IRON AND SILICA. THE DENSITY OF THE FALLOUT PATTICLES RAN GED FORM LESS THAN 3.7 GRAMS PER CUBIC METER TO BEYOND 4.2 GRAMS / CUB IC METER. PARTICLE SIZE DISTRIBUTION OF THE PARTICLE SAMPLES AND THEI R BLACK PARTICLE FRACTIONS FOLLOWED A LOG-NORMAL DISTRIBUTION. THE GE OMETRIC MEAN SIZE OF THE PARTICLE SAMPLES WAS 7-15 MICRONS WHILE THE S IZE RANGED FROM 9-17 MICRONS FOR THEIR BLACK PARTICLE FRACTIONS. TO ESTIMATE THE EXTENT OF FALLOUT THE FALLING TRAJECTORIES OF REPRESENTAT IVE PARTICLE SIZES OF BLACK PARTICLES WERE CALCULATED AND PLOTTED. TH E RELATIVE DISTRIBUTION OF URANIUM-238 ON THE GROUND WAS DETERMINED AF TER ESTIMATING THE WEIGHT DISTRIBURTION OF URANIUM-238 IN EACH SIZE FR ACTION OF BLACK PARTICLES. FROM THESE CALCULATIONS AND SEVERAL ASSUMP TIONS THE FRACTION OF URANIUM 238 DEPOSITED PER UNIT AREA WAS CALCULAT ED.


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