C
410302
UNIVERSITY OF WASHINGTON
SEATTLE, WASHINGTON 98195
August 23, 1974
College of Fisheries
Laboratory ef Radiation Ecology
Mr. Roger Ray
Asst. Manager for Operations
USAEC, Wevada Operations Office
P. O. Box 14199
Las Vegas, Nevada
89114
Dear Mr. Ray:
A second supplement to the 1973-74 Johnston Atoll contract was in
amount of $5977 for the analvses of samples collected at Rongelap
Bikini in April, 1974.
A report of the first results of analyses
submitted to Mr. Tommy McCraw, DOS, on 3 July, and a copy of that
the
and
was
letter
is attached. Following is a report of the results of the analyses for
the remaining samples.
Plutonium, iron-55 and strontium-90 analyses, except for one strontium-90
sample that was lost, have been completed for 38 samples of soil, fish and
_ coconut crabs collected on Bikini Island and Rongelap Atoll in April, 1974.
The results of these analyses are given in Tables la,
2a, 3a, 4, 5a and 5h.
Relative to the 3 July report, Tables la, 2a, 3a, 5a and 5b supplement
Tables 1, 2, 3 and 5, and Table 4 replaces Table 4.
In the soil samples, most of the 996, Pu, and gamma-emitting radionuclides
werg in the top 25cm of the profiles.
Strdnatium-99 levels in the coconut crabs were greater for the Bikini than
for the,Rongelap samples and, as exnected, the greatest tissue concentration
Sarathe eneskeleton.
The levels of 99¢r in the caconnt crab collected
( on Bikini Island in 1974 fall at the lower end of the ranse of values
;
§Yeported by Held (1971, NVO-269-8) for coconut crabs collected on Bikini
Island in 1969.
Two samples, the 0 to 2.5 cm increment from soil profile #2 and the Bikini
crab exoskeleton,are being reanalyzed for 29Sr because of inconsistent values
for the first two analyses.
Island in 1974,
Mullet and goatfish collected near Bikini
compared with fish collected there in 1969
similar levels of 90Sr but lower levels of 55Fe.
(Held, 1971), had
Except for the two samples being reanalyzed, this completes the analyses of
samples described in the Second Supplement to the 1973~74 Johnston Atoll
program. We are presently analyzing the remainder of the samples collected
during the April, 1974, trim to Utirik, Rongelap and Bilini Atolls as part
of the 1974-75 Johnston Atoll program.
Results of these analyses will he
forwarded to vou as they hecome available.