MEASUREMENTS OF AIRBORNE RADIONUCLIDES
215
(7 RAINOUT
7
fe
J
70
:
Zz
ps
o 6
:
5
2
”
4
ok
-
a
_
=
4
By
2
ee
nn
Fe
al
Yoomy
Fk
—
NPNE
FE
|
20
10
7
|
Mn
8C5
By
i
—
yo
LU
#
ee
a
2NIa
ra
m7
bE
2
an
30
fe
Ee
sd
40
4
&
4
a
o
Ss
4
80
z
7
oz
90
=
—
PSSA} DRY FALLOUT
100
EE
a
Ni
7h IR,
RADIONUCLIDE
oN
i
B
7
:
:
WAch,
nN
We,
Mee
Fig, 13—Percent of radionuclide found in solution in fallout trays.
rather short period of time and was then filtered, whereas the dry
fallout was collected over a period of several days in the water-filled
trays prior to filtration. The rather high solubilities of these radio-
nuclides facilitate studies of their oxidation states. Measurements
designed to determine the radionuclide oxidation states and other
chemical properties are presently being conducted.
PHYSICAL AND CHEMICAL CHARACTERISTICS
OF 434) IN FALLOUT
During the nuclear test series of 1962, measurements were made
to determine both the physical and the chemical form of ‘J in fallout.’
The physical form of ''I whether gaseous or particulate was deter-
mined by filtering air through a filter of 5 pore size for particle
removal and then passing it through an activated charcoal trap for
removal of gaseous !*4], The fraction of 81 associated with particulate