Manganese nodules recovered by R/V Vityaz expedition

Uranium, radium, thorium and ionium were determined directly on seven concretions from three stations in the Indian Ocean, and on two concretions and a manganese-rich crust from...针对印度洋3个站位的7个结核（concretion），以及来自……的2个结核与1块富锰结壳（manganese-rich crust），直接测定了其中铀、镭、钍及射钍（ionium）的含量。