4000000
counts
100000
KEUFFEL & ESSER CO.
100
IAee
Dae
ee
7 CYCLES X GO DIVISIONS
MADE IN U.S.A,
1600
19
20
Fig.
l.
40
60
80
100
120
MEV
140. 160
180
200
Gamma-ray spectrum of sediment from Bravo Crater
collected at a water depth of 160 feet, August, 1969.