6material used in the manufacture of this optical part shall not containthorium, other radioactive material, or any combination of nuclear materials in excess of 0.05 percent by weight as defined by the title 10, code of federal regulation, part 40.The infrared antireflective coating is excluded from this restriction and contains thorium approximately 0.0011 grams per square centimeter of coated surface.In addition, the amount of thorium used will be reported in accordance with specification sm-a-807570
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Last Updated: 03/10/2025