The agreement between spectrometric and ionization chamber total exposure rates is least satisfactory for Locations 1 and 2 on this island than fer other locations surveyed on Bikini and Eneu. This is probably due to the non-uniformity of distribution of radioactive materials on Nam. Near both Locations 1 and 2. highly active pieces of metal scrap were located in the soil within a few hundred feet of the measurement sites. Such deviations from uniform distribution change the spectrometer calibration slightly, though the exposure rate estimates from the tctal absorption peaks of the spectrum still represent close to average values for a large area about the detection point. Measurements with the ionization chamber cver a larger area would probably have resulted in a better average total exposure rate estimate. A soil sample was taken at Location 2. It is quite probable that this sample is not representative of the area as a whole, but the ratios of the ccncentrations of various major emitters present help verify the percentage exposure rates obtained from the field spectra. The laboratory NaI (Tl) gamma spectral analyses indicate that ““co does contribute about 50% of the exposure rate at this site with almost all of the remainder due to 7*’cs. The Ge(Li) spectrum (Figure 11) indicates the presence of **”Sb and *°* Eu and very slight traces of +P ep, +°° Rh, and aisc 24> am, and thus 7°° Pu. Two soil samples obtained in 1964 (nct at the same identical locations) indicate that at that time °"Co was responsible for ~70% of the tctal exposure rate. This may indicate that on islands such as Nar. where there is little organic material in the soil and sparse vegetation, weathering may be important and could have caused the total exposure rate to decrease much more rapidly than half-life analyses would predict. Unfortunately, due to the sparsity of the data and the observed non-uniformity of the radiation field, this t Se at hypothesis cannot be verified at this time. wert J. Aomen-Iroij Complex The Aomen-Iroij Complex consists cf the causeway connected islands of Aomen, Lomilik, Odrik, and Iroij from east to west respectively. These islands are centrally located along the