| http://www.w3.org/ns/prov#value | - osminium, platinum, polonium, rhenium, rhodium, silver, strontium, tantalum, thorium, tin, tungsten, uranium, zirconium, elements from the lanthanide group and elements from the actinide group, represented by more than 80 weight percent, and having a grain size distribution in the range of 20 ??m to 120 ??m, the method including the steps of:
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