él.
Machta, Lester
METEOROLOGICAL FACTORS AFFECTING SPREAD OF RADIOACTIVITY
FROM NUCLEAR BOMBS.
dourne)oftheWashingtonAcadeny
ofSciences &7, 169-79
-
(1957).
erations for local dispersement, accounted for in a day
or less, are:
(1) relative time of fall, as a function
of altitude, used to predict downward transfer of fall-
out,
(2) turbulent diffusion causing significant gravie
tation fallout velocity at rate of 0.1-0.01 mile/hr.
of particles of specific gravity 2.5 and 50 + » diameter,
and (3) precipitation usually caused by moisture entrain-
ed in the fireball and condensing upon cooling.
Interemediate fallout, extending a day to a month, usually
originates in the troposphere and rarely penetrates the
tropopause unless the fireball is from a high-yield
detonation. Transversal displacement of debris is computed to be predominantly cumulative in the same latitude
as characterized by the motion of atmosphere determined
by air masses carried zonally or latitudinally.
However,
anomalous situations can spread the debris to an entirely
K
ee eee ete ne Bh. .
Meteorological considerations accounting for atmospheric
dispersal of all types of radioactive particulate debris
caused by a nuclear explosion are explored on local,
intermediate, and delayed dispersement phases. Consid-
new and spearate area; therefore, apportionment of fallout
in the intermediate stage suggests newer and more efficlent methods of determining radioactive fallout are of
immediate concern.
Stratospheric sampling holds the key
to residence time and removal rate of radioactive debris.
The distribution in time and space may allow predictions
roroggter quantitative interpretation of residence time
of
Sr
62.
Marei,
A.
N.
EVALUATION OF SR’~
90
AS CONTAMINATING FACTOR.
Badiojogy 2, 89-95 (1957).
63.
(In Russian).
Medical
Miyake, Y.; and Saruhashi, K.
WORLD-WIDE STRONTIUM 90 DEPOSITION DURING THE PERIOD
FROM 1951 TO THE FALL OF 1955.
physics 8, 21-4 (1957).
MeteorologyandGeo-
* Miyake, Y.; Sugiura, Y.; Saruhashi, K.; and Kanazawa, T.
ESTIMATION OF THE AMOUNT OF SR-90 DEPOSITION AND THE
EXTERNAL INFINITE GAMMA DOSE IN JAPAN DUE TO MAN-MADE
RADIOACTICITY.
(1957).
MeteorologyandGeophysics 9, 222-231