carbon 14

The carbon 14 atoms oxidise to carbon dioxide which gets blown about and mixed up with lower atmosphere.

碳14原子氧化生成二氧化碳,向四周散去并与低空的大气混合.

Sampling and determination of carbon 14 in air

空气中~（14）C取样与测量方法的实验研究

Study on Root Exudates of Sassafras tzumu Seedling Using Carbon 14

利用~（14）C研究檫树苗根系分泌物

These neutrons react with nitrogen nuclei, giving out a proton and producing the active carbon isotope 14.

这些中子跟氮元素的核子产生反应，释放出一个质子并产生出活性碳同位素14。

A chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon 14.

这个海滩上的物质经过放射性碳测定。用放射性同位素碳14测定有机物年龄的化学分析。

The positive rate for Carbon-14 urea breath test in CHD patients was significantly higher than that of the controls ( 54% vs 30%, P < 0.01).

冠心病组14C尿素呼气试验阳性率显著高于非冠心病组（54%vs30%，P<0.01）；

Study on the affection of dead carbon to~ ( 14) C dating

死碳对~（14）C年代测定影响的初步研究

Effect of inorganic nitrogen on mineralization of organic carbon (~ ( 14) c+~ ( 12) c) in soil

无机氮对土壤中有机碳矿化影响的探讨

Carbon 14 age dating in Xinjiang and data base ( I)

新疆~（14）C年代测定及数据集（I）