|Radioisotopes||238U, 210Pb, 228Th, 228Ra, 226Ra, 40K, 137Cs|
This method specifies the minimum requirements and laboratory methods for simultaneously measuring multiple U-series nuclides, including 238U, 210Pb, 228Th, 228Ra, 226Ra, 40K, and 137Cs.
Samples are collected using crab sampler or gravity sampler, sealed on board and finally kept at -18°C. Post processing will take place in the land laboratory by freeze-dry and measuring using gamma-spectrometry. Isotope decay corrections are applied to some specific radionuclides (such as 210Pb, 228Th, 228Ra, and 137Cs) if the time gaps between sampling and measurement introduce discernible variations in activities.
|View Recipe (pdf)|