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Cadmium, gadolinium and samarium concentrations were determined in seven geochemical reference materials by isotope dilution thermal ionisation mass spectrometry. The results for all three elements in BCR‐1 are in excellent agreement with the compiled values as well as the literature values dete‐mined by isotope dilution mass spectrometry. The agreement with compiled values on the other material is generally good except for Cd where the values for BHVO‐1, BIR‐1, DNC‐1 and W‐2 need to be revised.