RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Production of Pure 123I by the 127I (p, 5n) 123Xe→123I Reaction
Kazutoshi SUZUKI
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1986 Volume 35 Issue 5 Pages 235-241

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Abstract

The excitation functions were measured for the nuclear reactions of 127I (p, xn) 123, 125, 127Xe. The maximum cross sections in the corresponding excitation functions were found to be 370 mb (at 54 MeV), 900 mb (at 29 MeV) and 280 mb (at 12 MeV), respectively. From the yield curves, thick target yields of 123Xe and 125Xe were estimated to be 5.2 GBq (140 mCi) /μA h in sodium iodide, irradiated by 60 Me V protons. The relationship among irradiation time, waiting time to generate 123I from 123Xe and outlet beam energy were discussed for the effective production of highly pure 123I The yield of 123I was calculated to be 0.52 GBq (14 mCi) /μA h in sodium iodide at optimum waiting time. For the practical production, an aqueous solution of 60% sodium iodide (10 mm thick) was irradiated at 3.2-4.1μA for 5-6 hours by 60 Me V protons under a flow of 30 ml/min helium gas which swept away 123Xe generated in the target solution. 5.6-7.0 GBq (150 -190 mCi) of 123I was obtained at the yield of 0.27±0.03 GBq (7.2±0.9 mCi) /μA h with 0.22±0.07% of 125I contamination. The yield of 1231 increased 1.6 times, using a solution of NaI (25%) +I2 (50%) +H2O (25%) .

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© Japan Radioisotope Association
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