-1G—
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 spec-
trometer with a 2-inch well-type sodium iodide crystal.
Samples
con-
taining significant amounts of gamma activity were analyzed to determine
the energies of the radionuclides present.
Samples containing detectable
amounts of beta activity were 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
Laboratory.
The radiochemical composition of nine samples was determined by
ion-exchange techniques.
Fish
A mid-water trawl of the Isaacs-Kidd type with a spread of six
(1)
feet
.
was used to collect fish and macroplankton from depths of 14
to 365 meters.
Trawl hauls were made at speeds of 4 to
and for periods of 35 to
147 minutes.
5 knots
A deep-sea, steam-powered
anchor-winch was used for streaming the trawl with a
1/2-inch