dose estimate if most units on the island had much lower concentrations than the highest unit. Average all the unit (1/4 or 1/2 hectare) average soil concentrations on an island and use this grand average to estimate potential dose. This method weights all units equally, even though some units would undoubtedly have greater utilization by inhabitants than other units. A conservative approach would be to use the cleanup criteria designation for the island (40, 100, or 400 pCi/g, for village, agricultural, or picnic islands, respectively). Dose esti- mates for this option were obtained by Robison, et al. in their dose assessment paper presented to us at the meetings. Conservative dose estimates are likely since most units have average soil concentrations much below these cleanup criteria. Perhaps the best method would be to estimate the dose separately for each 1/4 or 1/2 hectare unit on the island , using the estimated average soil concentration for the unit. These unit dose estimates could then be weighted depending On projected utilization by the inhabitants. IMP Calibration The Advisory Group's questions on the calibration of IMP were not adequately answered at the meeting. Dr. Gilbert agreed to contact EG&G and Eberline and appropriate Nevada Operations staff for further information. es criv r a r o p