410976
with which radioactive debris could be
disseminated by atmospheric processes
(7). By making certain assumptions
regarding the relative amounts of W'~
and Sr” produced during these tests,
the quantitative determination of these
isotopes ut later times can lead ta a
rough estimation of the contribution of
Sr* from Hardtuck to the total Sr”
ina given sample.
Radiochemical analyses of debris
from the Hardtack test series .adicated
Table PoVrre vonsentratiars of WHA? and Sree ag
several sites along the seth meridian (WO core
rected far decay to © July [958. Actieaty is
registered in disintegrations ger minute per 100
standard cumin meters.
Washington
Aone rin r ivf
rt
and-Se?. at?several sites long the SOth
$4
7?
, 0.69
60
“yor
7
“94!
ob
Jas
Pehe
t.4
Mm
° ie
Table 2. Contnbution of HardtackSr** te total
Sree in the ar expressedas purcentage.
Total,
Wish
Norther
ete Hp
Hemi
139°N)
aphere
Annto
Nisan
{tif N)
dul
apasia
a2
“4 ‘S)
dues
4
fy
to
Septs tthe:
¥
Tatal
Suuthern
Hemisphere
TK
rr
(Gla
gp
Beccary IGS
riegcon Hemigohers-—ahaut one-hill Ly 1a
sraent
mt per ™ of the e,tata
os and
Is
7.6
during’ she’aint of peak ait wctin ity
fromthe:‘previous series of nuclear tests,
WwW"
dani 1450
Wwe
ott
Vhiercse 2959
&q
!
mI
‘i by the:U.S,S. R.., in the Arcue (Octorere
MP Pak
November71.958}.
§
2 Simple salculgtions indicate that dur-
‘ateZo
.
F
30K
6.7
i activity’:
ate‘varies. with "latitude and
‘with’time.This ratio is considerably jower
eHof:ie
446
Mery Pals
4.7
Proving«:zing May:
T43
Marca dele
fu.4
yep
yield:of the series resulted from shots
(Hardtack: Nuclear tests. Some data on
ithe: meogured air concentrations of W'~
0.5%
u
duduory 19>
“more, that one-half the total fission
cprean be assigned to Hardlack or non-
gt
Septeortsr (aig
}.2
[ah
‘that this value is typical of all the
,‘tungsten-containing shots, and, further-
ay
—S
duly [ass
/Se*' activity ratio of the tungsten.containing shots (2). If it is assumed
wie
% Srv*
Wie
ra
ae value of 1000 to 1200 for the
"of this halure; aa W'*/Sr™ activity ratio
=
of near 500 is obtained as a reasonable
vst
aNigharacterization of this series.
Thus,
MBH‘airborne debris ii n filter collections mude
‘
Sab
various’sites during 1959, upon
-katradiqchemjeal analysis for W™ and Sr®,
ekand. with“suijable decay corrections.
Antofagasta
Nar
Wiss
Sr
eee
difs
71959 ‘only about § percent
ou
J
25
fake
etivityjn the North Lemper-
valong thes 80k
mernlian.
2“originated 'in the U.S. Hardtack tests
During’earlicr and later periods, when
radigagtivity. from the USSR tests
swas-noteso"prevalent in the ground.
the usefiness of Wo" ¢Fdeday half:
lifer as a tracer tar bhirdtaek Joprig is
perhaps at) percent of the tod Sr°
% (Table,2). In the Southern Hemisphere
decay at)
3
“al,
‘Hardtack debris contributed
ucing”‘early
ravidls nearing on en hegause of the
atopes depletion IhroughyafUIST
aL Litktsant, Ma
1959, while the actual
Koi
i i:Gone-quaner that in the Nucthera Hemi.
1
_ phere,the Hurdiavk series contributed
8synearly 20-percent of the total airborne
OSr*. This points up the tat that the
“sitatoapheric burden oof debris both
“ fran’ Hardtagh wmtrom other auclear
cles} series is considerably lower in (te
cae wey.. .- Southern than in the Northern Hens:
describes
Magdecay” to 18 “phere. Furthermore, it is evidence that
the transequatorial meving process in
eae trie
* 2. icicles Januy
May |: “the“Siratosphere. as in the (ropasphere,
ee ie as
a
slow one.
Parrerscs. Ja
AN OW
“T concentration inthe wip was ants
COON
Saunnras. Ja
R. W Brace
Nita Revo ft Ludaratory,
*
iastedertein, Qe
Melereneces
LW babhar Jr
we FR ON
h@t ciay
C8
tiwh dhe
Harnal
WW
Sueuteta,
Nae
desu
futsdad
osepport
Putte:
dts Yoernye
Ree ted tas
ohhoned from the (OS
tmiasien
WW Abge de Fane
=
RON Bamdy BOE
fur
tae
UM
Here
Ne
‘wh
wae
Snambe Emeray Coen
ts
es
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