JMSSJ On-line

JMSSJ On-line, Vol. 48 (2000) No. 2, pp. 131-133

*The Development of Isotope-Ratio Microscope for Realizing the in Situ* Survey of Small Isotopic Anomaly of Primitive Materials**		>> Full Text PDF >> References
Chiaki UYEDA^* ^* Institute of Earth Tary Science, Graduate School of Science, Osaka University (1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan)

A technique for realizing in situ isotope-ratio is reported for measuring small isotopic ratio by the use of the ion-microprobe. In the case of inhomogeneous insulator-samples, such as the primitive meteorites, the difference in conductivity of each grain causes considerable amount of instrumental mass discrimination. As a preliminary step to solve this problem, a metal channel is embedded and the analysis is taken along it. The method is effective to homogenize the surface ionization condition, and the ²⁶Mg/²⁴Mg ratio of individual spot with the size of 40 microns was measured with the error of less than ±3‰. This is a step to realize 2-dimensional isotopic ratio imaging.

Key words: Ion microprobe, In situ survey, Instrumental mass fractionation