Twelve two week Marshallese comparison urine samples were collected in October 1973 by Shoniber, Departmenc of Health Service . Trust Territory of the Pacific Islands and forwarded to BNL Zor anaivses. Cach sample vas to nave bean analyzed for $r-90, out and for natural K-40. line excretion rates Cs-137, Pur239 and Pu-240 from vorld-wide fall- The results were to be used to establish the base- for these radionuclides so that a reference against which urine samples from the atolls contaminated with troposheric fallout could be compared. During November 1978, Marshall Island's whole-body counting, environmental, demographic, Miltenberger. physiologic and bioassay data »ases were initiated dy Preliminary diet and living vattern reports were submitted to Robison (LLL) by Naidu. Under the RUDR program, 62 teeth samples from Bikini, Rongelap and Utirik were collected by 3NL Medical for future analyses of $r-90, Pu-239 and Pu-240. Naidu invited The Institute of Physical and Chemi- cal Research of Japan to contribute some Bikini ash to RUDR research. During January and February 1979, Lessard constructed appropriate dosimetric nodels and determined retrospective and prospective dose equivalents to various body organs for all former Bikini residents. This work also compared urine bioassay derived body burdens to whole-body counting measured body bur- dens for Cs-137. In January, a whole body counting field trip to Majuro to examine the former Bikini Island residents was undertaken by Miltenberger, Greenhouse and Craighead. They whole-body counted 101 persons and collected 49 urine sam- ples, 64 whole-body counts were from the relocated former Bikini residents. Miltenberger and Greenhouse continued to cross the Trust Territory to finish ll