Th and Pb data derived by gamma spectrometry for particulate (filtered and sediment-trap) and soluble fractions will be compared with those measured by the University of Washington group using the beta counting methods. Sandards prepared from `old' sediments are to be used to calibrate alpha and gamma counting systems, by comparing pairs of nuclides in secular equilibrium, such as U with Th, and Pb with Po. Interlaboratory calibration is planned for the measurements of Pb, Po, Th, Th and Be.