Determination of traces of ruthenium by neutron activation analysis using a polyethylene film |
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Authors: | Y Koda |
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Institution: | (1) Government Industrial Research Institute, Nagoya Hirate-machi, Kita-ku, Nagoya, (Japan) |
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Abstract: | A neutron activation analytical method is described for the determination of traces of ruthenium. Acid solution of an inorganic
chemical or seaweed ash is heated in a conical flask with oxidants, ruthenium ingredient is distilled and fixed on a polyethylene
film, which is placed on the top of the flask. Many films were irradiated together in a thermal neutron flux, and after about
a month γ-ray peak counts under the 497 keV peak of103Ru were measured with a well-type NaI(Tl) or a Ge(Li) detector. In the chemicals of fifty one elements, compounds of four
platinum metals were contaminated with 2100-150 ppb Ru, and Ga, In, Tm, Tb, Yb: all trivalent elements contained 510-16 ppb
Ru. The ruthenium content of all other chemicals were of ppb order or less. In these, Ga, In, Tm and Yb were known as scintigram
elements of cancer. In the ash of Porphyra tenera 2 ppb Ru was detected.
A part of this work was done under the Visiting Researchers Program of Kyoto University Research Reactor Institute. |
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