Simulation Study on the Measurements of Diffusion Coefficients in Solid Materials by Short-lived Radiotracer Beams

概要

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We have examined, by a computer simulation, an on-line measurement of diffusion coefficients by using a short-lived alpha particle emitter, 8Li (half life of 0.84 s), as a radiotracer. The energy spectra of alpha particles emitted from diffusing 8Li primarily implanted in the sample of LiAl are simulated as a measure of the diffusion of 8Li in the sample. As a possible time sequence for the measurement, a time cycle of 6 s, i.e. the implantation of 8Li for 1.5 s and subsequent diffusion for 4.5 s, is supposed. The sample is primarily set on a given temperature for the measurement. The time-dependent yields of alpha particles during the time cycle reveal the possibility to measure the diffusion coefficient with an accuracy of 10% if larger than $1\times 10^{-9}$ cm2/s, by the comparison with the experimental spectra measured at the temperature, i.e. at a certain diffusion coefficient.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2003-07-15