LARGE ARROWS"coom mearUNS TESTS IN EACH HEMISPHERE, >
;

‘

t+

Pu-239/Sr-—90 RATIO IN SURFACE AIR
|
+

o4

\

:
<

80N

70

Ee

b

60
!

50

e

:

30

i

40

\‘

e
émo

20

4

‘

kK

|

id

is.
-

‘

Zo
10

*
-

‘

20

.

j

i

30

’

40

=

50

60S

++
Lot

Jd

J

oF

M

bop

ty

tet

AMwJd

,

‘+
J

pt {too}

AS

O

N

DOD

VU

+ 44

oe

tp i

F

M

AM

J

JY

1967

A

SS

pap

ON

D

ye

IY

F

pb

.

TT

:

yp)

M

AM

J

J

1968

A

S$

O

|

N

D

io}

J

Pp

F

M

tT

AM

J

1969

v

og

Ms

.

CONTOURS ARE IN PERCENT. ARROWS INDICATE THE CATE AND RANGE (SMALL ARROWS~KILOTONS, LARGE ARROWS-MEGATONS) OF ATMOSPHERIC NUCLEAR WEAPONS TESTS iN EACH HEMISPHERE

“

r
+

BON

e

FIGURE 4
Pu-238/Pu-239 Ratio in Surface Air

9

|

+

>
;

J

.

'

7O-

r

60+

i

50

.

30h

3

40h

.

BE
;

20;

_

Io _—

i

fs

§ 0

lobe

j

20+

.
r
=

30+

40

L:

50/60s

s
+?

J

J

oF

,

§

tt

MAM

JJ
966

+4

£

i

AS

4

+

j

ON

j

DOD

JV

4

F

4

\

j

MAM

\

tt

J

\

++

Jo

1967

}

A

1

S$

\

4

ON

j

DOD

J

\

F

ARROWS INDICATE THE DATE AND RANGE (SMALL ARROWS -KILOTONS, LARGE ARROWS-MEGATONS) OF ATMOSPHERIC NUCLEAR

4

M

4

j

AM

\

JS

1

YY

4

j

t

A

t

J

S

\

jy

ON

WEAPONS TESTS IN EACH HEMISPHERE

D

dS

{

FO

}

OM

4

A

j

mM

{

OS

j

r

Select target paragraph3