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  • Author or Editor: A. Friedman x
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Abstract  

A system was developed which enables the user to separate remotely228Th from its daughters using a hot cell. The thorium is adsorbed on an anion exchange resin and the daughters elute through the column. The radium and its daughters can then be loaded on a generator outside of the hot cell. The radium is obtained quantitatively with virtually no breakthrough of the thorium parent. Subsequent to the separation, the thorium can be recovered quantitatively from the column.

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Abstract  

Monte Carlo calculations were done to simulate the decay of80mBr in order to estimate the energies and distribution of Auger and Coster-Kronig electrons emitted in this de-excitation process. Results show that for an isolated atom, the average number of electrons emitted per decay is 6.926 and 8.016 for an atom in the condensed state. These values agree well with experimental results of Wexler and Anderson. The average calculated electron energies were 1122 eV and 991 eV with ranges of 8.02 A° and 6.71 A° in unit density matter for the isolated an condensed states, respectively. These results will be used to estimate localized energy deposition which will be correlated to the radiotoxic effects of80mBr-bromo-deoxyuridine as measured in experiments currently underway in our laboratory using cell cultures. Our aim is to assess the radiotoxicity of low energy, short range electrons for its eventual use in cancer therapy.

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Abstract  

211Pb and its daughters are produced in a generator system which utilizes the distillation of the intermediate daughter219Rn from223Ra. The radium is precipitated as the stearate to isolate the parent while allowing the gaseous daughter to emanate. While the yield of the system is low, approximately 10%, the radionuclidic purity is extremely high. No measurable223Ra is found in the product.223Ra is separated from its parent,227Ac, by cation exchange.

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