“…The Bruker ARTAX software was used to deconvolute the spectra, and the curved shape of sherds was adjusted for with a Rayleigh scatter distance correction. The generated net counts were converted into concentrations using a bespoke in-house calibration for 15 elements (Ca, Co, Cu, Fe, Ga, K, Mn, Nb, Pb, Rb, Sr, Ti, Y, Zn, Zr) that was created for ceramics with high percentages (>8%) of calcium (Burton et al 2019;Wilke et al 2017). The capability of the device and the in-house calibration was evaluated by analyzing 14 powdered certified reference materials, including ore, sediment, rock, and ceramic, using those values that fall within the range found in low-fired archaeological ceramics (Appendix 1), as well conducting repeat measurements on a single standard (SARM69 -Brick Clay) at the start of each session.…”