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首页> 外文会议>American Chemical Society(ACS) National Meeting; 20020408-20020410; Orlando,FL; US >Interface of Environmental, Bioassay, and Radioanalytical Standard Reference Materials and Traceability Evaluations
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Interface of Environmental, Bioassay, and Radioanalytical Standard Reference Materials and Traceability Evaluations

机译：环境，生物测定和放射分析标准参考物质与可追溯性评估的接口

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摘要

Radiochemistry is the cornerstone for certifying environmental natural-matrix Standard Reference Materials (SRMs), and for verifying environmental and radiobioassay test samples for the National Institute of Standards and Technology (NIST) traceability evaluation programs. Natural-matrix SRMs provide the basis for radiochemical methods validation, demonstration of traceability for environmental radionuclide measurements, and the basis for measurement comparison over time within and among laboratories. The certifications of eight natural-matrix radionuclide SRMs are conducted through the efforts of intercomparisons of experienced laboratories from around the world. While the SRM program has been successful in certifying many radionuclides in environmental matrices, there have also been several unresolved radio-chemical issues left to future efforts. The evaluation programs provide the program participants with a direct and unambiguous evaluation of the traceability of their radioanalytical capabilities by NIST. Because the participants in the evaluation programs depend on absolute confidence in the results of the evaluation to assess their radioanalytical methods for bias from the national physical standard, Bq, NIST must verify the production of the test samples to approximately 1 percent (relative combined standard uncertainty) with radiochemical measurements that depend on extraordinary laboratory practices.
机译：放射化学是认证环境天然基质标准参考材料（SRM）以及验证美国国家标准技术研究院（NIST）可追溯性评估计划的环境和放射生物测定测试样品的基石。天然基质SRM提供了放射化学方法验证的基础，环境放射性核素测量的可追溯性证明，以及实验室内部和实验室之间随时间进行测量比较的基础。八种天然基质放射性核素SRM的认证是通过来自世界各地的经验丰富的实验室进行比对而进行的。尽管SRM计划已经成功地证明了环境基质中的许多放射性核素，但还有一些未解决的放射性化学问题留待未来的努力。评估计划为计划参与者提供了直接，明确的NIST对放射分析能力可追溯性的评估。由于评估计划的参与者依赖评估结果的绝对可信度来评估其放射分析方法是否偏离国家物理标准（Bq），因此NIST必须将测试样品的产生量验证为大约1％（相对组合标准不确定度） ）的放射化学测量取决于非常规的实验室操作。

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