Mu eee. 1178 Mr. Yares. now ( find the mi Dea '75 we were asked by the Department of Interior for OTDullding additiona] houses in the interior of Bikini Island. It was at that time we mounted « rather large survey effort which included a lot of people going out and walking aroundthe island with instruments. We have very large surveys done at that time with 30 or 40 people going out and making measurements of the soil. water samples. vegetation samples, and measuring the externa! radioactivity. Mr. Yates. Were thease tests being taken prior to 1975 as well! Yes. But not anywhere nearthe acale we did this time. We concentrated on Bikini Island. It is precisely for this reason we want to hare an aerial survey because we can cover much more territory and much faster and we can see the same levels. When you have a person walking around,it takes more time. Mr. Dewcan. I understood vou to sey that this rise in the level of measurements of strontium began in 75 and that your preliminary analysis indicates that it is coming from the food source and that that food source began to mature last year. How can we measure the increase in 75 when vou sar that it is com- ing from the food if the food wasn't being produced until 77! r. L. That is a very good question. McCraw has done a lot of thone surveys. , w. When the people first returned. there were few if anv terrestria) food items grown in Bikini Island soil. and available for their use. There are some things that grow wild. There were a few coco- oa nuts and arrowront. There was a significant planting of coconut trees during the arigcu}*ural rehabilitation effort. Mr. Dcncax. Those were the ones that began maturing in ‘76 Am I not correct ! We are in °78. 80 last year would have been 77. But now he is saying that the planting began to mature and it wes 76, so we are narrowing the gap. Mr. peYounc. It started in 76. Mr. Dexcan. It could be coconut or arrowroot that was being con- sumed prior to 76. You began to notice « rise in the levels of cesium and that those levels have risen more rapidly since the domesticated plants matured and were consumed by the inhabitants. Mos Link. WV. were initially using a predictive capability for a number of itemsin the diet that are now growing in the atoll. All we could do at first was sample the soil and try to predict the Jevels in Mr. Yates. Where were they coming from! You said a number of items were not being grown. McGea®. A numberof items of the normal] diet were not lo- cally available when the people first went back. Those things have subsequentiy become available and we are seeing an increase in availa- bility, an increase in uptake, and you can't see at what exact point in timethings occurred. - - Mr. Drxcan. Is there a level of sophistication to measure this that has been increasing! So we might attribute the greater levels to 8 greater ability to measure what was there all along? TT Ves . atples. : measure it easily. You can always measure if ~siland vegetation and went through a very costly DOE ARCHIVES 5002412