铀

One scientist noticed a mark on a photographic plate that was near uranium.

当时，有一个科学家注意到，在一个靠近放置铀元素地方的照相底板上多出了一个记号，他不知道这个记号是怎样会产生的。

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。

The transuranic elements especially the minor actinides in spent fuel represent potential environmental radiotoxicity hazard in the long term.

核电站乏燃料中超铀核素，特别是其中的少数锕系核素（Minor Actinides，简称MA），对环境具有潜在长期放射性危害性。

The present project intends to develop a new compound only containing CHON, which can extract U, Pu and the minor actinides together form the acidic media to integrate the reprocessing.

本课题旨在寻找一种新的只含CHON的化合物，能够从酸性介质中同时萃取铀、钚和次锕系元素，实现后处理一体化。

The natural series are the thorium series, the uranium series, and the actinium series.

天然的放射性系是钍系、铀系和锕系。

A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead.

一种存在周期短的放射性金属元素，由铀形成，能分裂成锕然后分裂成铅。

Mineralogical characteristics, formation environments and environmental mineralogical significance of uranium acyl arsenate minerals in China are discussed systematically in this paper.

对我国产出的铀酰砷酸盐矿物的矿物学特征、形成环境和环境矿物学意义进行了较系统的综合论述。

There are 8.6%~10.91% foreign matter in the sphenes, in which radioactive elements of strontium, cesium and uranium range from 4.26% to 4.58%. The change of structural cell parameters of sphenes is still very little,Δa=-0.0009 nm~0.0041 nm,Δb=0.0018 nm~0.0004 nm,Δc=0.0002 nm~0.0048 nm,Δβ=-0.10°~0.09° with high crystallinity of 99.27%~96.46%. Though, the age of sphene from the Fenghuang Mountain is about 1000 Ma, and experienced 775 Ma~1758 Ma geological evolvement and alpha decay, its crystallinity only decreased 3%, and its crystal shape and structure are still fine, indicating that sphene is of good ability to solidify radioactive elements. Therefore, sphenes are ideal minerals for solidifying nucleus waste.

通过对北祁连牛心山变质杂岩体中榍石(775Ma)和山西凤凰山花岗岩中榍石(1758Ma)的XRD及EDS等测试与研究，结果表明：两地榍石的杂质元素质量分数高达8.6%~10.91%，放射性核素锶、铯和铀的质量分数达4.26%~4.58%；晶胞参数的变化极小，△a=-0.0009nm~0.0041nm、△b=0.0018nm~0.0004nm、△c=0.0002nm~-0.0048nm、△β=-0.10°~0.09°，结晶度仍高达99.27%~96.46%，榍石经过10×10^8a的地质作用，结晶度仅减少了3%，显示榍石固化放射性系列核素的能力较强，虽经历了约775Ma~1758Ma的复杂地质演化及其所含放射性核素的衰变作用，其晶体结构完好，稳定性极高，是值得期待的理想核废物固化矿物。

Iran had first told the International Atomic Energy Agency that its last experiments with the reprocessing of plutonium took place in 1993 but revised that date to 1998, according to a draft speech deputy IAEA chief Pierre Goldschmidt is due to make to the agency's board of governors on Thursday.

Plutonium：钚，一种天然地放射性银色超铀金属元素，存在于铀矿中，对铀元素进行中子轰击而人工制成。它是一种核辐射毒素，特别是能够被骨髓吸收，并被用作一种核反应燃料并用在核武器中。

The tendency of uranium content in the main Irtysh River is increasing from upstream to the downstream.

可可托海稀有多金属矿废水中仅由铀和钍产生的α射线比活度之和就已经超过了国家污水综合排放标准（其中铀产生的占99％以上）。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了