1. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences Koptyug Avenue 3 Novosibirsk 630090 Russia
2. Magadan Regional Museum Karl Marx Avenue 55 Magadan 685000 Russia
3. Archaeometry Laboratory University of Missouri Research Reactor Center 1513 Research Park Drive Columbia MO 65211 USA
4. Far Eastern Geological Institute, Far Eastern Branch of the Russian Academy of Sciences 100‐Letiya Vladivostoku Avenue 159 Vladivostok 690022 Russia