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The distribution of radioarsenic among the various products in the presence of oxygen has been determined in the following series of experiments : 1. 1 M ASCl 3  in benzene has been activated with thermal neutrons, 2.  77 GeCl 4  has been kept in contact with benzene, and 3.  77 GeCl 4  has been kept in contact with benzene in the γ-field of a  60 Co-unit, at two different gamma dose rates. The distribution of the products (labelled with  76 As and  77 As, respectively) was determined by high-voltage paper electrophoresis. The results show that: 1. the distribution of radioarsenic is not only dependent on the properties of the recoil fragment produced in the nuclear process, but also on the radiation-increased chemical reactivity of the organic environment, 2. both  77 As formed in the ( n, γ ) reaction and  77 As produced by β-decay give the same organic yield, however, some changes in the distribution of products are observed, 3. the formation of the products by the hot processes is due mainly to reaction of the recoil atom with a single medium molecule or with its fragmentation products.

The Chemical Forms of Radioarsenic Activated in β- Decay of 77 GeCl 4 and in the 75 ASCl 3 (η, γ) Reaction in Benzene