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(upeme)
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ETE
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POMONA AMANHOOO NR OONWMO
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a90NN0 °
SESE EB SEES OM ONO
2094900 NADCONMO
PFOPT NP JHOG PO PRACAAIS FH
MOAFOAON ILA SHtKOKOONGS
SLESESS IGSEEERESTS TAI|
90000
AAA Aad
Location
Gross
Table 2,
F
SHOCSSHAROHIATR SYS HS SEG
Regen
& ~&ctivity in Rain Weter
(cpm
esadas8
Ada as Soa aod
89s,,
905, and 137¢, in Rain Water
_—io
|
KATSURAGI
a) Preparation of samples.
The amount of rain water collected aboard the
observation ship was mostly less than one liter for each
‘rain falle Therefore, water samples which were collected
on closer dates and location were combined and the
ses
analyse
were done on the composite samples.
b) Methods of radiochemical analyses
Water sample was evaporated to about 20 ml in a
beaker.
.
After the solution was acidified with hydrochloric
acid,, carriers of Fe, Sr, and Cs were added. pH of the
selution was adjusted to 8 with ammonia solution to
‘separate iron hydroxide by filtration.
Iron hydroxide
was dissolved again with hydrochloric acid and the residue
was digested twice with a small amount of diluted
hydrochloric acid. The filtrate was combined and pH
of the solution was adjusted again to 8 with ammonium
hydroxide to separate iron hydroxide.
After iron hydroxide was filtered, pH of the filtrate
.
.
ipitat
9 with
sodium
carbonate to precip
i : °
was adjusted to
alkaline earth carbonate. After calcium was separate
by
using the funing nitric acid methoipid and bariun and
geaiumore romver ss chromate precipitate, Sr ond
89Sr were counted.
Nitric acid was added to the filtrate
from the carbonate and 157Cs was separated by the addition
of solid ammonium molybdophosphate.
137Cs was counted
with a r ray spectrometcr.
SAAR S220
ZARA S See eeeeeoe
MOSISXS ~QeOCCOONC-+00000
BPoO
VY TYYs
stoN
wons
Gona
nano
in
UNIANonO
On
N RO WA
@SS
GkS
5ng
n
090006 4 lo C000 Q°0 9 dodddd
at @ ~t 90 S080 ©
TRLORODSGOUA SSS
MANATOSCOV
DOSCOHFRAAARM AMA
*
ap
*=
Mm
PROM
NNN
Nm KR ”RR
sa
A low back ground window-less gas flow counter whose
+8 ency was 36/and the pack ground und was:
was
counti; ng effici
0.9--1.0 cpm, was used for
sr and
©’Sr determination.
ad) The results of determination
Table 1*3 shows the results of determination of 90Sr,
Q.
spo hr nmmnouonno
maga
S Sage ss NA
c) g counter
RR
OK
SAITO TS
The counting was done
899, and 15’cs in rain water.
value of 89sr was
the
and
1962
September,
14th-l5th
July Vy 1962.
reduced to that on the lst
Is
~ eypeteorological Research Inslitute
—~5—
t