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Rongelap remains slightly radioactively contaminated but careful sur-
veys showed the island to be safe for habitation by the summer of 1957
when the people were returned to Rongelap. Studies of the body burdens
of radioactive materials in these people is an important part of the
medical surveys. A 21 ton steel room with very sensitive radiation
detecting equipment; has been used in the past 2 annual surveys at
Rongelap to determine the body burdens of radionuclides. In addition
numerous urine samples have been analyzed for radioactivity. The
results of these studies show that there has been an increase in body
burdens, principally of Cesiuml3T, Zinc©S and Strontium?, since their
return +c Rongelap. About the seme levels of these isotopes have been
noted in those exposed and umexposed.