-10-
of an end-window counter with a 2-inch Anton tube in a 3-inch Anton
shield and a Nuclear-Chicago Model 181 scaler.
The correction factors
for geometry, self-absorption, backscatter, and
decay used to convert
c/m to d/m/g of wet tissue at time of collection are included in Appendix
Tables D to H,
The samples for total gamma counting were placed in pliofilm bags
and counted in a single-channel, 50-position,
automatic~advance
trometer with a 2-inch well-type sodium iodide crystal.
spec-
Samples con-
taining significant amounts of gamma activity were analyzed to determine
the energies of the radionuclides present.
amounts of beta activity were
Samples containing detectable
recounted at frequent intervals to de-
termine radioactive decay.
Because of the difficulties of weighing samples aboard ship,
weights were determined at the Eniwetok Marine Biological
The radiochemical composition of nine samples was
the
Laboratory.
determined by
ion-exchange techniques.
Fish
A mid-water trawl of the Isaacs-Kidd
(1)
feet
was used to collect fish and macroplankton from depths of 14
to 365 meters.
and
type with a spread of six
for periods
Trawl hauls
of
35
to
were
147
made
minutes.
at
<A
speeds
of
4
to
5
knots
deep-sea, steam-powered
anchor-winch was used for streaming the trawl with a
1/2-inch