ABSTRACT
oil gaamples from Rongelap Atoll were analyzed for radionuclide
content.
Using ion-exchange methods, a detailed study was made of
a soil sample collected ina bird nesting area at Kabelle Island in
July 1957.
Two radioisotopes, antimony-125 and europium-155, not
previously reported in samples from the Pacific Proving Ground were
found and their identity was verified by radiochemical precipitation
techniques.
The radionuclides contributing most of the radioactivity
were Ce l44_p, 144 and Fe??, a non-fission product.
Other radio-
nuclides present in much smaller amounts included Ru 106. Rp106,
90
,,90
gr99_y99
rv" ~
¢
137
54
60
95
Mn°*,
co®?
zr95_nb?*,
r
Co 57 .