Hot Atom Reaction of ¹⁵O in Solids

Abstract

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.

On the Recoil Chemistry of 15O in Oxoanion Salts

“…In a preliminary report [4] it was shown already that in some types of oxo-salts, in contrast to some Oxides [5] and sulphates [6] an appreciable fraction of the activity produced by the (n, 2n) reaction with fast neutrons can be recovered as molecular O'^O. It was observed [4] that salts of oxo-anions with high oxidation Potential tend to combine a high yield of 0' ^0, with high radiation chemical yields GCOj).…”

Excitation Function for 15O Production via the 14N(d,n)15O Reaction

“…Numerous studies have been reported in the literature on the production and uses of oxygen-15 as a radiotracer in chemistry [1,2] and in the life sciences [3,4,5]. The combination of pure positron emission {ß* = 1.74 MeV) and the relatively short physical life (r,/!…”