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  • 1 Indira Gandhi Centre for Atomic Research Safety Research laboratory Kalpakkam (India)
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In hypothetical accident scenarios for Light Water reactors, the extent of release of iodine upon irradiation needs to be assessed for the purpose of evaluation of the applicable source term. In this context, an understanding of the behaviour of aqueous cesium iodide solutions subjected to high gamma-ray fluxes acquires significant importance. In the present work, gamma radiolysis of a cesium iodide solution (10–2M I) with and without boron additive is investigated by irradiating with60Co source at ambient temperature. Upon irradiation of the CsI solution, iodine is liberated, and the concentration of iodide in the KOH trap present in the radiolysis vessel increases with dose. The radiolytic products I 3 , IO 3 and H2O2 formed in the irradiated solution are also estimated and G values obtained are reported. G(I 3 ) and G(IO 3 ) are of the order of 10–3 and 10–4, respectively. G(H2O2) decreases with increase in dose. Addition of boron up to 200 ppm, does not appear to alter significantly the release fraction of iodine.