Adsorption of Fission Products on Various Surfaces 881 than with electrons. The great effect of radiation quality in water, in contrast, is due to the active competition in the particle tracks between firstand second-order radical reactions.If the smaller radicals are formed by breakup of pentane molecules they should all be "primary" radicals with the free valence at the end of the chain. The C5Hn could be primary, or either of two secondary forms, depending on where the hydrogen atom was lost from pentane. A random recombination of such radicals imposes considerable restriction on the relative yields of the various products. Thus if the 100-e.v. yields of methyl, ethyl, propyl, butyl, sec-amyl and n-amyl are denoted, respectively, by A, B, C, D, E and F, and the sum of these six (the total radical yield) by R, we will have for observed yields of heavy products the expressions shown in the third column of Table I. We have ten observations to fit with six parameters-A fairly good fit, shown in Table I (not necessarily the best fit) has been obtained by assuming A = 0.

Cesium, coprecipitated with copper ferrocyanide, can be readily removed from radioactive process waste water using sodium lauryl sulphate (NaLS), cetyl trimethyl ammonium bromide (CTAB) or gelatin (Gl) as collector. In addition to the effect of the collector type on the percentage removal and volume reduction, the effects of the pH of three distinct Cu 2 + : Fe(CN)J ~ ratios and of different ageing periods of the cesium-copper ferrocyanide-water systems have been established. With NaLS, CTAB and Gl successful removals could be achieved in the pH ranges 3-7.5, 5.0-10.5 and 5.5-9.0 respectively. The results are discussed in terms of the ionization of the active groups of the collectors and of the electrical state of the precipitate.

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