prov:value
| - Suitable materials include, for example, bismuth, copper, iron and iron-containing alloys such as steel and stainless steel, gold, lead, molybdenum, nickel, platinum, silver, tantalum, tin, tungsten, zinc, mixtures of two or more of the foregoing, mixtures of one or more of the foregoing in an inorganic matrix, e.g., high-lead glass, mixtures of one or more of the foregoing in an organic matrix, a
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