not yet available. The body burdens estimated above are far below the maximum permissible levels; Cesium"? is about 16 per cent and Zinc® about 10 per cent of their respective maximum permissible levels for non-industrial populations. In Figure 10 spectrographs to Rongelap. on the island the increase in body levels of isotopes is shown in the gamma of a Rongelap man before (1957) and 20 months after returning The background radiation resulting from residual contamination presently averages about 0.04 mr/hr which represents a dose of about 350 mr/yr. Present Status It is apparent that the Rongelap people have recovered fromthe acute effects of their radiation exposure and the examinations now emphasize detection of possible late effects of irradiation about which little is known in man. No acute effects have been observed related to the internal absorption of radionuclides and late effects are not expected, due either to their initial intake or to subsequent low levels acquired from living on the slightly contaminated island of Rongelap. However, the habitation of these people on the island unity for a most valuable radiation ecological study. Since of radioisotopes are necessary for detection with present equipment, the several radioisotopes present on the island affords the opportonly small amounts sensitive measuring can be traced from the soil through the food and into the human being where tissue and organ distributions, biological half lives and excretion rates can be studied. Summary A medical survey of the Marshallese people in March 1959, five years after exposure to fallout radiation, showed that the people had recovered from the acute effects of their radiation exposure and appeared to be generally in good health. The following specific statements can be made in regard to their radiation health status: 1. No illnesses or diseases were found that could be directly associated with acute radiation effects. 2. One case of cancer and three deaths have occurred, but with no direct relation to radiation effects. 3. Fertility does not appear to have been affected. The incidence of miscarriages and stillbirths appears to be somewhat higher than in the unexposed Marshallese, but a deficiency of vital statistics precludes definite conclusions as to whether or not this is a radiation effect. 326