“200 . ay ee Protile éamplea of the lagoon’ bottom werdobtainedoft Kabelle ‘Leland at depths of €0-feet and 40 feet and off Lomajlal - Teland at 55 feet. ‘The samples wereobtainedby an aqualung equipped diverdriving a foot long, 14" alwainun tube into the | pottomsand. The core was removed from the tube and samples | - were taken at various levels, From thecounts of these samples z 1t was observed that the radioactive sand on the lagoon bottom was several inches thick with the level of activity rather ¢con~« stant for the first five or six inehes, The radioactivity per unit weight wasless than that of the sell from the island properbut off Kabelle it was greater than that of the sand in the intertidal zone. Be vater - . . The water collection Included eight aalt-water samples = | fron the lagoon and eight fresh-water somples from the tetends proper. A Semiliiliter sample was used for the radioactivity determination except for the December 18thcollection (cistern water, filtered well water), far which a5unilliliter samples 2 were used,Because the radioactivity of water samples is often | atated in terms of the radioactivity per liter, which would | mean extrapolation considerably beyond the observed values,1% ia especially necessaryto state the counting error. Por. these data the 0.95 counting ervar,* which is equivalent to two a standard, deviations, Was arbitrarily selected. . In. Appendix * AgcU-262 (Mon P-126) Statistical methods used in the measure~ -went of. radloactivity. (sous. usefuleraphs) AS H. Jarrett, TES ey Oak Ridges: December2DABs : ae arn oA US