32 result from any conceivable single event but would be the conseqae: of cumulative effects over a long pericd (plus, of course, the abednce of any attempt to make repairs). It is the committee's view, he would prevent human access to the contaminated debris buried with Any soil-cement or tremie material spilling or eroding from the do into the lagoon would cause little change to the concentrations ca transuranics there. Measurements on such material drilled from tip dome showed a mean concentration of transuranics of 21.4 pCi/g wi range of 1.8 to 52.3 pCi/g. Lagoon surface sedimentmeasurements Faken within a mile of Cactus Crater show a range of transuranic concen tions of transuranica in the superficial sadiments. Even if material from within the dome were to contribute to tik water column concentrations independently of the radioactivity no the sediments, the upper limit of the radiological hazard would 4 game as that estimated in the previous section for leaching. A all of the transuranics in the dome were remobilized to the water column of the lagoon, the result at most would be an increased only 1 mrem (to bone marrow) through the ingestion of marine foods 5.9 Summary It is clear that the estimates made here and in the previous section depend directly on the validity of the dose estimates cals lated by Robison and co-workers. These, in turn, depend om diet surveys made at Ujelang and on measurements made by Noshkin and co-workers (1980) of the transuranic concentrations in marine foo It is conceivable that new observations will lead to new estimate: uranics is an extreme one and is not supported by any existing evidence. For example, if the rate of remobilization from the dome to the lagoon was similar to that from the lagoon's sediments, i.e. 30-year integral dose to bone marrow would be only 0.01 mrem (ses section 5.7). Further, the estimated dose from the ingestion of & foods from present concentrations in the lagoon is sgzall. It q require an increase of about 10° in the present estimate to prod: a dose level that would be of serious concern. the contain«ent structure will fail in its function of preventin access to its contents and that no credible health hazard would even if the containment structure’s transuranics were leached orlerodes into the lagoon.