1 So, that was my list from yesterday of questions of the data that 



2 we don't really have data to have, or those are problems with the 



3 existing data. I think when we discuss the hypotheses, it will come out 



4 even more strongly what we don't have. Are there additions to that list 



5 or any discussion on those? 



6 DR. VALENTINE: I'd like to limit that 1,000 meters to about 750 



7 meters. 



8 DR. BUTMAN: Okay. 



9 DR. VALENTINE: This one here (indicating). 



10 DR. BUTMAN: Mike, you actually talked about additional 



11 measurements of radioisotopes in other canyons. 



12 DR. BOTHMAN: There is a tremendous lack of information there. 



13 DR. AYERS: I missed yesterday. Could someone elaborate on the 



14 stripping and the scavenging mechanism that we are talking about? Is 



15 that yours? Could you tell me more about what you mean by that? 



16 DR. BOTHNER: It would amount to a 10-minute talk. In 25 words or 



17 less, the lead-210 and the plutonium that we found in box cores from 



18 Lydonia Canyon axis compared to the continental slope is a much higher 



19 inventory and a higher specific activity in the canyon axis. 



20 Since both those isotopes are considered to be models for sediment 



21 reactive contaminants in seawater, we find these higher inventories and 



22 activities from a non-core source suggest there are mechanisms for 



23 concentrating those isotopes. 



24 The resuspension that we find in the canyon axis is the likely 



25 mechanism to account for their higher inventories and activities. 



26 DR. AYERS: Did you find them throughout the canyon or where did 



27 you find the higher levels, the higher concentrations, along the axis of 



28 the canyon? 



29 DR. BOTHNER: Yes. We've got one core at 630 meters in the canyon 



30 axis compared to one core at 630 meters from the slope. There are 



31 additional cores that came from what I call the deep water monitoring 



32 program on the slope and rise in which these isotopes can be measured, 



33 and should be, but have not yet been done. 



34 DR. AYERS: Okay. 



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