victims of radium poisoning tended to come from the higher-income class since the radium treatments were not inexpensive. During this period, one group of mental patients received known amounts of radium chloride intravenously for therapeutic purposes. Follow-up studies of these patients, involving repeated and comprehen- sive observations, have yielded extensive data on the detection, distribution, retention, and injury sequelae of the medication. Continuing studies of the radium poisoning cases are being carried on by Dr. Robley Evans and his co-workers at the Massachusetts Insti- tute of Technology, Cambridge, Massachusetts; and at the AEC's Argonne National Laboratory in Chicago. Some additional, but more limited studies are being carried on elsewhere in the United States. In 1941, standards for maximum permissible body burdens for radium for man were established by an Advisory Committee* to the U.S. National Bureau of Standards. 4 The maximum body burden was set at 0.1 microcurie -- the value that is still in use today and the value adopted by the International Commission on Radiological Protection. Additional information about the effects in man of internally-deposited radionuclides comes from experience with the fission-product radioiodine produced during nuclear weapons tests. lap Atoll natives is well known. The case of the Ronge- Accidentally they were exposed to the * This Committee is now called the National Council on Radiation Pro- tection and Measurements and frequently is referred to as NCRP.