15
3
x10°
T
T
T
10°
4
137
Net Counts Per Minute
Cs
SPIKE
10°
4
J
Sb’ SPIKE
io b
Tor
4
SOIL
9-10’
10°
1
0.5
L
1.0
i
1.5
MEV
Fig. 6.
Gamma-ray spectrum of a 9 to 10-dnch-depth
increment from old soil compared with the
gamma spectra of sbt25 ana cs37,