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A number of years ago a few measurements were made to study the fate of atoms formed by the (n, 2n) reaction in solids of a simple composition. The materials were irradiated with fast neutrons in the IKO synchrocyclotron and dissolved in a suitable aqueous medium. Air was passed through the Solution to expel dissolved radioactive oxygen. The activities of the original material and the deaerated Solution were compared. (To exclude the possibility of radioactive oxygen gas escaping from the irradiated solid, the Irradiation and the subsequent measurement of the total activity were performed with the sample enclosed in a thin polythene foil, even though one would expect such a precaution to be unnecessary.)Results are shown in Table 1. Because these figures were obtained by difference, they should be interpreted only to mean that the fraction of the activity present as does not constitute more than a small portion of the total 150.This Observation may be of some interest in view of the formation of relatively large quantities of I^nn by the (n, 2n) and (7, n) reaction in a number of simple nitrogen Compounds [ 1, 2,3,4, 5] which do not have a high 0 : N ratio.

Der G‐Wert der radiochemischen Reduktion von OsO4 (etwa 1 mmol/l) in 0.03 M NaOH wird zu 1.11 +/‐ 0.05 bestimmt, er ist in weitem Bereich praktisch unabhängig von der OsO4‐ (0.6 bis 5.6 mmol/l) und NaOH‐Konzentration (0.03‐0.06 mol/l).

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