Old Carbon Project

老碳项目

• 批准号: 0098601
• 负责人: Harry Gove
• 金额: $ 9万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0098601&HistoricalAwards=false
• 关键词: Old; Carbon; Project

"Accelerator mass spectrometry (AMS) was first developed in 1977 as a way todirectly measure the ratio of radiocarbon (carbon-14) to stable carbon(carbon-12) in organic material and thus to determine when the organism diedusing samples of a milligram or less. For reasons that are not completelyunderstood the technique is presently limited to samples that are 60,000years old or younger. Even for samples, e.g. carbon from oil, natural gas(methane) or coal, that are millions of years old this limit applies. Itthus prevents the dating of very old samples. It also prevents theselection of sources of natural gas for use in the production of very largevolume liquid scintillation detectors for the measurement of low energyneutrinos. The measurement of these and higher energy neutrinos from thesun is presently an important scientific endeavor. One would like to findsources of methane that have carbon-14 to stable carbon ratios correspondingto 110,000 years, or, perhaps, even to 150,000 years from whichscintillation liquid can be manufactured to allow the measurement of thelowest energy solar neutrinos. The proposed research has the aim ofmeasuring such ages of methane and other organic material by AMS."

“加速器质谱法（AMS）最早是在1977年发展起来的，它是一种直接测量有机物质中放射性碳（碳-14）与稳定碳（碳-12）的比率的方法，因此可以用一毫克或更少的样品来确定生物体的死亡时间。由于尚不完全清楚的原因，这项技术目前仅限于6万年或更年轻的样品。 即使对于样品，例如来自石油、天然气（甲烷）或煤的碳，这些样品已经有数百万年的历史，这个限制也适用。 因此，它阻止了非常古老的样品的年代测定。 它也阻碍了天然气源的选择，这些天然气源用于生产用于测量低能中微子的超大体积液体闪烁探测器。 对太阳中这些和更高能量的中微子的测量是目前一项重要的科学奋进。 人们希望找到甲烷的来源，其碳14与稳定碳的比例对应于110，000年，或者，甚至150，000年，从中可以制造闪烁液体，以允许测量最低能量的太阳中微子。 这项研究的目的是通过AMS测量甲烷和其他有机物质的年龄。"