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PubMed · 7283153

A simple program which processes liquid scintillation counting data from samples containing both 125I and 3H under conditions of varying quench.

V D Winston·D K Anderson·R A Consigli
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Iodine RadioisotopesScintillation CountingTritiumJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, P.H.S.

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V D Winston, D K Anderson, R A Consigli. 1981. A simple program which processes liquid scintillation counting data from samples containing both 125I and 3H under conditions of varying quench.. https://doi.org/10.1016/0003-2697(81)90446-2

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Root-uptake of radioiodine by rice plants.

Root-uptake of iodine by rice plants from two different soil types was studied using an 125I tracer. At harvest, the 125I concentration was lowest in brown rice (hulled rice) followed by the rachis, stem and leaves. The transfer factors of iodine for brown rice grown on Andosol and Gray lowland soil (fine texture) respectively were 0.007 and 0.002. The ratio of the radioiodine concentrations between flag leaf (first leaf blade) and brown rice was about 400. Transfer factors in plants grown on Andosol were higher than those grown on Gray lowland soil. This may be related to the high 125I concentration in the Andosol soil solutions, particularly after the flowering period. The adsorption and desorption of iodine in the soil was effected by flooding with water and also by the cultivation of rice plants. The radioiodine concentration in the soil solutions first increased in the upper soil layer than in the lower layer. The desorption pattern of iodine was influenced by the soil types.

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PubMed1991

Isolation of mono- and di-iodine 125 tyramines for conjugation labelling.

Here we describe a method for isolating mono- and di-iodine 125 tyramines from a crude tyramine radio-iodination reaction mixture. Tyramine was radio-iodinated according to a modified chloramine-T method. Mono- and diforms were separated from each other, as well as from free 125I and unreacted tyramine, by means of paper electrophoresis or thin-layer chromatography. Both 125I-tyramine derivatives finally obtained were pure and had high specific activities, which averaged 2500 Ci/mmol for mono-125I-tyramine and 5000 Ci/mmol for di-125I-tyramine. Due to their characteristics, these derivatives can be used for labelling various substances indirectly and preparing in vivo and in vitro tracers of high purity and specific activity, when conjugation labelling is required.

Iodine Radioisotopes↗