gamma-spectroscopy system and compared them with the EG&G aerial gamma measurementof 1978. As part of this process, an independent reviewer, Dr. Herwig Paretzke of the German Radiation Institute in Munich, Germany, exposure rate determined from o gamma measurements (McGraw and Lynch, 19/73; Robison unpublished data from Bikini Island, 1987); based on measurements at Rongelap Island participated in the measurements to evaluate our methodology and compare our results with the EG&G 1978 data. The results of the measurements made using our in-situ sodium iodide crystal spectrometer system and the EG&G data are listed in Table 1. EG&G's data were listed as ranges for each contour. Our locations were within the specified contour ranges. In addition, in 1988, LLNL staff took more specific external gamma measurements of 137Cs and Co inside and outside of houses and other buildings as well as around the village area. These measurements could not be taken with the aerial-measurement system used in 1978. The buildings provide shielding so that the exposure rate is reduced compared to the maximum effective dose occurs in th first year and is about 0.11 mSv y-! (11 mrem y-! Table 1. Comparison of the EG&G aerial gamma measurements with the LLNL in-sigx measurements for 157Cs. 137Cs5, wR h-! Island /Site LLNLa I EG&G aerial contqurs4 Rongelap — R23 2.1 1.6-2.8 R25 35 1.6-2.8 Pit22 3.7 2.8-4.1 R20 » 2.6 1.6-2.8 3.8 1.6-2.8 R9b 2.6 1.6-2.8 R13 1.7 1.6-2.8 0.98 0.51-0.98 1.5 0.98-1.5 R18 R9a , : 2.6 1.6-2.8 Ailinginae C24 C23 a Decay corrected to 1995. gamma