SAMPLE SHUTTLE FOR FLUORESCENCE-YIELD X-RAY-ABSORPTION DETECTOR MAINTAINS SAMPLE CHAMBER PURGE ATMOSPHERE

X-ray absorption measurements of low-Z elements (Z < 20) are feasible when performed under a He atmosphere. We describe a sample shuttle for use with a popular fluorescence detector that maintains a stable He-p urged atmosphere and allows rapid exchange of samples with reproducibl e positioning. No waiting time is needed following sample exchange and fluorescence intensity variations due to sample chamber gas compositi on changes are minimized. (C) 1997 American Institute of Physics.