9 The next phase of this study is now underway -- May 1966. Thy- roid specialists are again examining those children originally thought to have thyroid abnormalities. I would assume the results will be available in the near future. There seems to be firm evidence that weapon-produced radioiodine can produce physiological effects. In the case of the Rongelap incident, the thyroid damage was produced by the fallout from a single nuclear explosion. In Nevada, if indeed the thyroid abnormalities are found to be attributable to radioiodine (and as I just mentioned, no such causal link has been established), the fallout from a number of test detonations may have contributed, and if the radioiodine should be implicated, there seems little question that its route of entry was through fresh milk. Drinking water supplies predominantly are from wells. During the Atomic Energy Project of World WarII, large research. programs in radiobiology were undertaken; and through the use of animal experiments, a great deal of knowledge has been generated on various internally-deposited radionuclides. But the basic source of information on the bone seekers (and this includes strontium~-90) stems from the early radium experience. The animal experiments have shown that certain of the bone-seeking nuclides produce greater damage to the bone than radium for the same E