16
1O°
T
T
—T
10%
4
2 oo,
& sg 1O7F
-
~
&
3
MN
o
%
1"
a
& 8
On 4
2 os
cg
a ox
QG
°&
g
S
2
10°
F
7
1.3
8&
&
"
4 8
See
1O
F
—
31
8
]
|
0.5
]
1.0
2
L
1.5
MEV
Fig. 7.
Gamma-ray spectra of depth increments of old soil taken
from the surface inch.
The origin of each sapectrum has
been arbitrarily separated from the preceding one by a
factor of ten to facilitate inspection of the figure.