( -. .,. - -- ~,r” .. /’ 410082 ,-’<”””- ““ ‘ ,4’-”’ ‘7 , / JULY 1982 FIELD TRIP REPORT Brookhaven National Laboratory has continuously monitored the radiological status of persons inhabiting areas in the Marshall Islands which were contaminated by fallout from Pacific nuclear testing, As part of this monitoring a whole-body counting, urine, breast milk, and fecal sampling program was performed,during July 1982. Biossay &ta were obtained (see Table One) from the residents of Rongelap Atoll, the former residents of Bikini Atoll and from unaffected individuals at Majuro Atoll who volunteered to be part of a comparison population.’ Effective dose equivalent assessments for inhabitants of this region are to be made based on these data and prior measurements. The attached computer printout forms contain the directly measured bodyburden &ta for CS-137, K 39-41, CO-60 and Bi-207 obtained in July 1982. Historic body burdens of gamma-emitting nuclides are also included. Par- ticipants in the whole-body counting program included persons above five years of age. Gamma emitters were detected by using a chair-geometry whole-body counter, a computer-based multichannel.analyzer, and a Sodium Iodide detector. The spectra from the whole-body counting measurements were stored on magnetic disks and are retained at the Laboratory. A complete body-burden history was given to each person after verification of the current whole-body count. Whole-body counting results from this trip have been verified and were entered into the computerized body-burden data base. The tables showing individual body burdens were generated from this data base. Replicate counting, point-source counting, background measurements and other quality control . measures were made to ensure proper calibration of the system, and to facilitate the interpretation”of spectra. F