AN 41902. The ARL QUANT’X EDXRF spectrometer provides ppm level measurements of Pb, Cd, Hg, Cr and Br, all in a single test. The ARL QUANT’X is ideal for laboratories where fast turnaround time for samples is required with high performance. The unique Peltier cooled detector eliminates the need for liquid nitrogen cooling, thereby simplifying operation and lowering operating costs.