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Science 8 July 1977:
Vol. 197. no. 4299, pp. 159 - 161
DOI: 10.1126/science.197.4299.159
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Articles

Comparison of Radioactive and Stable Tl+ Diffusion in Potassium Chloride: Demonstration of a Transmutation Effect

G. C. T. WEI 1 and B. J. WUENSCH 1

1 Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge 02139

Radioactive 204Tl+ was found to diffuse in potassium chloride up to three times more rapidly than stable Tl+. The difference is attributed to the 204Pb2+ daughter element produced by beta–emission. A theoretical model accounts satisfactorily for the discrepancy and indicates that internal sources of cation vacancies are effective in maintaining electroneutrality at all but low temperatures.

Submitted on October 5, 1976
Revised on February 4, 1977

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Science. ISSN 0036-8075 (print), 1095-9203 (online)