The levels of carbon-14 isotopes rose sharply in the atmosphere after the nuclear weapons tests during the Cold War, and they provided a date mark in the cells. 研究者们观察死者脑细胞时发现这是显而易见的。冷战期间由于核武器实验,大气中的C-14含量迅猛增长。
Right now we are carrying out Carbon-14 tests on three of the eight skeletons found in St. Ursula. 我们现在对在修道院的8个骨骸做碳14测试。
Carbon-14 concentrations in the fat cells correspond to levels present in the atmosphere when the cells were created, giving the researchers a way to date when the cell was born. 碳-14的在脂肪细胞中的浓度与当时细胞产生时候空气中的碳-14的浓度相关,这给研究人员提供了一条测知细胞产生日期的道路。
Tritium and carbon-14 in the environment 环境中氚和碳-14
Ages of some carbonate deposites sampled in South China were determined by ESR dating. The results show a good consistence with the Carbon-14 method. 本文用ESR断代法测定某些碳酸盐沉积物的年代,其结果与~(14)法符合得很好。
According to the result of environment tritium math-physical model and carbon-14 age dating, think the renew ability of the thermal water in study area is confined and inhomogeneity. 根据环境氚的数学物理模型计算和碳-14测年结果,关中盆地热水可更新性具有有限性和非均一性特点。
Problems in carbon-14 dating of marine sediments 海洋沉积物质~(14)C测年的若干问题
Carbon-14 dating and its problems of the late Paleolithic in China 中国晚期旧石器的碳-14断代和问题
240 values of tritium, carbon-14 and carbon-13 of groundwater, surface water and precipitation have been measured for the Taiyuan region. 在太原地区测试了240个地下水、地表水和大气降水的~3H、~14C和~13C值。
Error analysis of the carbon-14 dating ~(14)C断代的误差分析
Self-absorption correction for carbon-14 samples 碳-14试样自吸收的校正
Based on the researches of the foraminiferal fauna and the isotopic carbon-14 dating, it has been found that the stratigraphy of the El core can be divided into three phases: A. S1& S3 ( 0. 00~ 3. 34m) fall into Holocene; 依据有孔虫动物群的研究和碳同位素测年,可将E1孔的地层分成3段:S1&S3(0.00~3.34m)为全新统;
By means of the tested data of Hydrogen-Oxygen stable isotope, and isotopes of tritium and Carbon-14, the environmental isotope components of various groundwater subsystems being analyzed, meanwhile, the circulatory characteristics of groundwater are discussed preliminarily. 通过氢氧稳定同位素、氚同位素和碳-14的测试数据,分析了各地下水子系统的环境同位素组成,并初步讨论了地下水系统的水循环特点。
Thermoluminescence and carbon-14 dating methods applied to quantitative studies of the Holocene Active Faults in Datong and Jinzhong basins, Shanxi 山西大同与晋中盆地全新世活动断裂定量研究中热释光与~(14)C测年方法应用
The theory of judging the era by using carbon-14 in archaeology 碳-14考古断代原理