Determination of 210pb, 210po, 232th, 230th, 228th, 238U, 235U and 234U with Alpha Ray Spectrometry in Manganese Nodule Standard Rock Sample JMn-1

210Pb, 210Po, 232Th, 230Th, 228Th, 238U, 235U and 234U in Geological Survey of Japan manganese nodule standard rock sample JMn-1 were determined by radioactive isotope dilution/alpha ray spectrometry. Extraction chromatography, anion exchange chromatography and solvent extraction were applied to the analysis. The analytical results of Th and U in JMn-1 were in agreement with the literature values determined by ICP-MS (inductively coupled plasma mass spectrometry) or INAA (instrumental neutron activation analysis). It was found that the concentration of 210Pb in JMn-1 was higher than that in other certified reference materials for environmental radioactivity. JMn-1 proved to be useful for quality control sample in the analysis of environmental radioactivity.