NSF-Arizona Accelerator Facility for Radioisotope Analysis

NSF-亚利桑那州放射性同位素分析加速器设施

• 批准号: 8822292
• 负责人: Douglas Donahue
• 金额: $ 71.92万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-07-01 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8822292&HistoricalAwards=false
• 关键词: NSF; Arizona; Accelerator; Facility; Radioisotope

This award provides approximately one-half of the funds required to operate the NSF-Arizona Accelerator Facility for Radioisotope Analysis on an annual basis. The rest of the annual operational funds are to be raised from user fees. The "carbon-14" method makes use of the known rate of radioactive decay of this carbon isotope and the well-determined systematics of its chemistry in the atmosphere-biosphere- lithosphere-hydrosphere cycles in order to use it as an extremely valuable tool in dating natural samples and artifacts in the 100- 60,000 year range. The accelerator facility supported by this award extends the use of the carbon-14 method to extremely small samples, samples with very small concentrations of carbon, or very old samples with very little carbon-14 content.

该合同提供了每年运营美国国家科学基金会-亚利桑那州放射性同位素分析加速器设施所需资金的大约一半。年度运营资金的其余部分将从用户费用中筹集。碳-14“方法利用这种碳同位素已知的放射性衰减率及其在大气-生物圈-岩石圈-水圈循环中确定的化学系统，以便将其用作测定100-60,000年范围内的自然样品和文物的极有价值的工具。该奖项支持的加速器设施将碳-14方法的使用扩展到极小的样品、碳浓度非常小的样品或碳-14含量非常少的非常老的样品。