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适用范围：<p>Plutonium dioxide is used in mixtures with uranium dioxide as a nuclear-reactor fuel. In order to be suitable for this purpose, the material must meet certain criteria for plutonium content, isotopic composition, and impurity content. These test methods are designed to show whether or not a given material meets the specifications for these items as described in Specification <a href="http://myastm.astm.org/SUBSCRIPTION/NewValidateSubscription.cgi?C757-HTML">C757</a>.</p> <p>An assay is performed to determine whether the material has the minimum plutonium content specified on a dry weight basis.</p> <p>Determination of the isotopic content of the plutonium in the plutonium dioxide powder is made to establish whether the effective fissile content is in compliance with the purchaser''s specifications.</p> <p>Impurity content is determined to ensure that the maximum concentration limit of certain impurity elements is not exceeded. Determination of impurities is also required for calculation of the equivalent boron content (EBC).</p><p id="s00002">1.1 These test methods cover procedures for the chemical, mass spectrometric, and spectrochemical analysis of nuclear-grade plutonium dioxide powders and pellets to determine compliance with specifications.</p> <p id="s00003">1.2 The analytical procedures appear in the following order:</p>