ABSTRACT
Soil samples 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 réporied in sampies from the Pacific Proving Ground were
found and their identity was verified by radiochemical precipitation
techniques.
The radionuclides contributing most of the radioactivity
were Cel44_p, 144 and Fe??, a non-fission product.
Other radio-
nuclides present in much smaller amounts included Ru106_Rp 106,
90
_,,90
Sr°--Y"", Cs
137
54
» Mn’, Co
60
', Zr
95
“-Nb
95
_”, Co
57