10%
T
T
10° F
~
&>
x
G
~
2
=
_
4S
x
Q
10
2
—
So
a
wn
S
Q
0-1
9s
4
>
g
QO
\
a
~
8
> 2
7
107 [—
:
a3
~~
x
"
3.1"
8
1
!
|
0.5
1.0
1.5
2
MEV
Fig. 7.
Gamma-ray spectra of depth increments of old soil taken
from the surface inch.
The origin of each spectrum has
been arbitrarily separated from the preceding one by a
factor of ten to facilitate inspection of the figure.
AS