A Direct Measurement of the Atmospheric Production Rate of Radiocarbon

大气放射性碳生成率的直接测量

• 批准号: 0110538
• 负责人: John Mak
• 金额: $ 10.11万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0110538&HistoricalAwards=false
• 关键词: Direct; Measurement; Atmospheric; Production; Rate

This project will make direct measurements of the production rate of radiocarbon in the atmosphere by exposing a known amount radiocarbon free air to atmospheric radiation at a known altitude (near 16 km), latitude, and longitude using a balloon platform. This is the first time that the production rate will be directly measured in the atmosphere near the level of maximum production. The measured rate will be compared directly with those previously calculated by extrapolation from thermal neutron measurements. An accurate measurement of the production rate is needed for using radiocarbon as a tracer of global hydroxyl radical distribution, and for developing a better understanding of the global carbon cycle.

该项目将使用气球平台，在已知高度（近16公里）、纬度和经度，将已知量的无放射性碳空气暴露于大气辐射，直接测量大气中放射性碳的产生率。 这是第一次在接近最大生产水平的大气中直接测量生产率。 测量的速率将直接与以前通过热中子测量外推计算的速率进行比较。 使用放射性碳作为全球羟基自由基分布的示踪剂，以及更好地了解全球碳循环，需要精确测量生产率。