24 days after the contaminating event.
Analysis of the 24 day urines per-
formed 2 years later showed that the samples also contained some sr and
ce",
sr? activity in the urine decreased from 12 d/m/l1 in the 24th day
specimens to 0.34-1.41 d/m/1 in the 1957 specimens. Sr” analyses on urine
samples taken in the 4 year survey have not been completed.
The cs? uriw
mary activity finctuated, decreasing from 174 d/m/l1 on the 24th day to
33 d/e/l in 1956, and then increasing to 137-370 d/m/l in 1957.°
Prelimie
nary analysis of the 1958 data indicate that the cs? activity in urine
increased by a factor of 100 over the 1957 levels.
(Two residents of Utirik
Atoll who had been living on their island since several months after its
accidental contamination in the 1954 fallout had urinary cs? actigities
of 11,653 and 3,735 d/m/l in 1957.)
Ags part of the 3 year post~-exposure survey 4 of the Rongelap
people were brought back to Argonne National Laboratory where a more direct measurement of the internally deposited gamma emitting radioisotapes
was obtained. (5)
Cs
137
was identified as being the most prominent gamma
202 microcuries of Cs
residents.
137
and ,03=,07 microcuries of Zn
65
\
in the Rangelap
\
Two Utizik rasidents similarly measured had 0.22 and 0.41 mie
crocuries of C5 137 and .482 and .229 microcuries of zn®* , 06)
\
6. We are grateful to Col. James Hartgering (MC) USA, Maj. Kent T. Woodward
(MC) USA, Lt. Ariel Schrodt of the Walter Reed Army Medical Center,
Dr. john Haricy and Mr. Edward Hardy of the New York Gperations Office
of ABC, and Dr. Stan Cohn of US NEDL for assistance in radio chemical
analyses.
~1j~
ee
Analysis of the spectra indicated an average body burden‘ of
——e
am
aa
” a
a
cdiscovered,
eee ES
emitter and the presence of the neutroneinduced radionuclide zn®> was