NOTES SOIL 1. Spec. No., Collection date, Area collected, Description, 2; Beckman readings in mr/hr taken 1" above ground - shield closed/shield open. Background - 0.05 mr/hr. 3. Wet" refers to weight of soil as received at HASL. 4. "Dry" refers to soil aliquot dried at 100°C for eight hours. Depth, Backman readings - information supplied by A. Seymour. 5. Procedure: a. Soil aliquot ashed at 550°C for 8 hours, then dissolved in HNO3. Solution aliquot plated directly on glass planchet for beta counting. Standardized against 0.2 gram KeC03, mounted in similar manner. b. Self-absorption correction applied in each case: based on self-absorption of activity in two top soils. 6. Sr-90 - suitable aliquot taken from solution of dissolved soil. 7. Error term associated with each result is one Poisson standard deviation. SEAWATER 1. Spec. No., Area collected, Collection date - information supplied by A. Seymour. 2. All islands in Rongelap Atoll except Mogirt which is part of Alinginae Atoll. 3. <All water collections made in lagoons except Mogiri, where collection was made from anchorage. _ k. The total activity result was obtained by precipitating carbonate from a 200 ml.aliquot, mounting on 2" plastic disc and - l2 -