Hoffmann, D., Prytulak, J., Richards, D., Elliott, T., Coath, C., Smart, P. L., & Scholz, D. (2007). Procedures for accurate U and Th isotope measurements by high precision MC-ICPMS. International Journal of Mass Spectrometry, 264(2-3), 97-109. https://doi.org/10.1016/j.ijms.2007.03.020