page 28
Order number
710.
set S with 1OPFICEALUSE ONLY
940406-171827
CORPORATE SOURCE
(USA)
DATE (YYMMDD)
Naval Radiological Defense Lab.,
San Francisco,
CA
371. PUB.
590219
'
34. CLASSIF. LEVEL TEXT
Unclassified
The activity of coral fallout particles was
950. ABSTRACT
studied as a function of individual size. Single
particles from two shots at Operation Redwing were sized
and identified as being of a spheroidal, irregular or
dendrite-like type and then measured for gamma activity.
Two particle size parameters were employed, equivalent
projected area diameter (D{sub a}) and maximum diameter
(D{sub m}). The study shows that an extensive range of
activities is associated with each size and size-type
group. Field data taken at one station indicate that the
activities of a size-type group follow a normal
distribution. According to the same data the activity
varies as D{sub a}{sup 2-2} and D{sub m}{sup 1} {sup 7}
for irregular particles, D{sub a}{sup 2} {sup 7} for
spheroidal particles, and D{sub m}{sup 2} {sup 1} for
801.
Item
KEYWORD(S)
dendrite-like particles.
FALLOUT/particle size ;FALLOUT/radioactivity ;
REDWING/fallout
GAMMA RADIATION
;FALLOUT; RADIOACTIVITY; REDWING; SHAPE;
49
150.
110.
REPORT NUMBER
70.
710.
PERSONAL AUTHOR (M)
PRIMARY TITLE (M)
CORPORATE SOURCE
NRDL-TR--208
Nature of individual radioactive particle. VI.
Fallout particles from a tower shot operation Redwing
Adams, C.E.; O'Connor, J.D.
(USA)
371. PUB. DATE (YYMMDD)
34. CLASSIF. LEVEL TEXT
950. ABSTRACT
of,
Naval Radiological Defense Lab.,
San Francisco,
CA
571202
Unclassified
Studies were made of the structure and composition
and the distribution of radioactivity within,
the
fallout particles resulting from a tower shot in
Operation REDWING. Techniques utilizing the petrographic
microscope and x-ray diffraction analysis were employed.
Three types of fallout particle were found. The most
common type was formed by the interaction of the
vaporized iron and radioactive elements with molten
calcium oxide derived from the coral sand which was
carried up into the fireball by atmospheric turbulence.
These particles consisted of an outer zone of
radioactive dicalicium ferrite surrounding an inactive
residual core of altered calcium oxide. The second type
consisted almost wholly of radioactive iron oxide and
apparently was formed by the melting and oxidation of
part of the steel tower. The third type consisted of
5003402
CFFICIAL USE ONLY