Photon-Activation Analysis for Iodine by Using Cesium as the Internal-Reference Element

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The internal-reference method proposed previously has been applied to the determination of iodine by photon-activation analysis, using cesium as the internal-reference element. The present method is based on the measurement of the 126I, 124I and 123I activities produced by the neutron-emitting reactions in iodine, and on the comparison of these activities with that of 130I coming from cesium by the (γ, 2pn) reaction. A lithium-drifted germanium diode with a sensitive volume of 36 cm3 was used as the detector. The yields of various photonuclear reactions in both elements have also been examined as a function of the bremsstrahlung maximum energies up to 65 MeV. A series of synthetic mixtures of iodine-cesium with known weight ratios has been used to check the sensitivity and the accuracy of this method. We found that we could determine amounts of iodine down to 0.2 μg under the present experimental conditions.
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