-~ 10 molecular binding for 238pu0,. and weakened in ‘ is speculation by the author and appears somewhat oversimplified. 1) Page 7, lines 8-12 ~ "Flejgcher proposes that the apparently higher dissolution rate for PuO, may be explained by the alpha recoil nucleus ablation of the surface layers of the particles, with a fragmentation rate proportional to the specific alpha disintegration rate and with variable sizes of fragments ranging up to +104 atoms." Comments: Fleisher's suggestion that aggregate recoil explains the increased dissolution rate of *78puo over * p05 Clearly, this is a radiolytic effect, but the exact mechanism has not been unequivocably demonstrated. Page 7, lines 12-14 - "The poorer structural integrity of the 238pu0, particles may give rise to an increase in the size range of the ejected fragments." Comments: The reference to ".,.poorer structural integrity of the 238puo,- +." gives the impression of being a factoral statement; in point of fact it is the author's speculation, and possibly an erroneous one. When *38pu05 . . : : : 2 . . is prepared in a manner identical to the preparation of 395u, investigators do not feel that the 238 Pu0» has "poorer structural integrity” or lower density than 239 Pu09, although it does have a lower median particle size. This alae could account for a higher solubility rate, in so far as the 238pu0, particles would have a larger surface area per wnit mass (or activity) than Page 7, 239 Pu0y particles. - lines 14-17 - "Such small fragments, ranging up to tens of angstroms in diameter or more, would pass readily through the 0.1 pm diameter Por ss of the membrane filters used in the dissolution experiments dye Comments: Whether small ablation fragments, if they are formed, can pass readily through a membrane filter rated at 0.1 wm pore has not been demonstrated. This assumption and those following, while perhaps reasonable, are assumptions of the author.