isotopes

The catalytic gas liquid isotope exchange reaction is a good method to prepare tritiated triptolid.

采用催化气液同位素交换法制备了氚化雷公藤甲素,探讨了反应时间和反应介质对反应产额的影响。

There are 37 lectures, major headings are geochronology, radiogenic isotope geochemistry and stable isotope geochemistry.

这里有37讲，主要是地质年代、性同位素地球化和稳定同位素地球化。

Tritium is one of the mildest radioactive isotopes.

氚是辐最和缓的性同位素之。

High mass resolution spectrometer for isotope seperator on line(ISOL) in(Beijing) radioactive ion-beam facilities(BRIF) project requires mass resolving power of(20 000).

13串列加速器升级工程中的在线同位素分离器(ISOL)高质量分辨谱仪要求20000的质量分辨。

The lead isotope study shows that ores of the Mujiazhuang copper deposit and the host rocks contain very high radiogenic lead.

表明，穆家庄铜矿矿石铅和近矿围岩岩石铅具有极高的性成因铅特点。

Through K-Ar isotope age study in pillow basalt,has gained the isochrone age is 139Ma.The age is the formation age of pillow basalt.

在枕状玄武岩中获得K-Ar（全岩）同位素年龄为139Ma（测试单位：宜昌地质矿产所同位素室），因此确定其时代为晚侏罗世晚期。

The researchers found that isotopes from the shock front were mixed into the protosun in a manner consistent with their origin in a supernova.

人员发现，激波阵面中的同位素混合到原太阳中，混合方式跟起初在超新星中的时候致。

Breath tests using fatty acids with a stable isotope (13C) were carried out on patients with SSc in order to detect malabsorption and hypoperistalsis.

为检测肠道吸收异常和蠕动功能降低，我们对硬皮病患者使用稳定同位素13C标记的脂肪酸吸收呼吸试验，前瞻性地观察到了胃肠道的受累过程。

Uranium isotope abundance ratio has been measured by total sample evaporation and signal integration,and a thermal surface ionization mass sepctrometry equipped with multicollector has been used.

采用全蒸发技术、离子流强度积分的方式,用多接收器热表面电离质谱计测量铀同位素丰度。