It
74
Ne
TT
i
Trad
td
tte)
ied
de
add
Ratio ot t=O
=
100
C
©
_
<
a
x
Non-Hardtack
P
:
lO-
“I
C
>
4
To
a
>
.
_
—
Z
a
)
4
<I
w
1O -
7,
=
™
—
©
2
-
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o
“
N
on
a
a
v
=
=
L
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r
C
LE
PF
L
Ol
-
=
w”)
4
.
4
@
7
2
°
os
3
2
-
c
oO
oe
>
ok
OY
“I
=
=o
Hardtack
Series
Li
?itfTetetfteftfjftilldlistt
\k
°|
{fj
|
|
|
lt
t
tt
tf
MAMJJASONDJFMAMJJASONDJFMAMJ J
1958
1959
1960
Fig. 6 -- The Zr ics)?! activity ratio of Hardtack and
non-Hardtack radioactivity
122
7
tC
t
tN
Hardtoack