A new method for U-Th-Pa-Ra separation and accurate measurement of 234U-230Th-231Pa-226Ra disequilibria in volcanic rocks by MC-ICPMS

►A new chemical separation method for U-Th-Pa-Ra from a single sample aliquot. ►Detailed MC-ICPMS procedures to determine U-series disequilibria in volcanic rocks. ►Reproducibility of multiple analyses on separate digestions of BCR2, W2a and TML. ►The method is less time consuming and avoids the problem of sample heterogeneity.