Back extraction by hno3 - hf and back extraction by concentrated hnch after lower the concentration of organic phase are studied, the method of back extration by hnorhf can not be used to icp - ms, because some zirconium is hydrolysis when hf is removed by heat. however, the method of back extraction by concentrated nitric acid after lower the concentration of organic phase can be used to icp - ms, the recovery is 93. 2 %, rsd % is 5. 24 %, the decontamination factor of uranium is 3. 2xl04, the detection limit of zirconium is 0. 04ng / ml. the method of tta extracting trace zirconium in uranium is firstly used to icp - ms, the result is satisfied, it can be used to determine zirconium in uranic production quickly and veraciously
本文通過研究hno _ 3 - hf反萃和稀釋有機相後用濃hno _ 3反萃這兩種分離方法,認為hno _ 3 - hf反萃由於在加熱去除hf時酸度不易控制,導致鋯
的部分水解,因而此方法不宜用於icp - ms中,然而稀釋有機相後用濃hno _ 3反萃法用於icp - ms測量中,全程回收率為93 . 2 ,相對標準偏差為5 . 24 ,
鈾的一次去污因子為3 . 2 10 ~ 4 ,鋯
的測定下限為0 . 04ng / ml ,本文首次將tta萃取分離
鈾中鋯用於icp - ms測量中,結果令人滿意,此方法適用於快速、準確測量
鈾產品中微量鋯。
None of the xenon isotopes we measured were the direct result of uranium fission
我們所測量到
的氙同位素,根本都不是直接由
鈾的核分裂而來。
The author and two colleagues recently used measurements of xenon gas ( a product of uranium fission ) to deduce that one of these ancient reactors must have operated with a duty cycle of about half an hour on and at least two and a half hours off
作者與兩位同事最近透過氙氣(
鈾的核分裂產物)
的測量推測,這些遠古反應器其中之一必定曾經以運作半小時、關閉兩小時半
的周期進行核反應。
The simulation can be divided into three processes sequentially : calculating the induced fission neutron rate of uranium and space distribution by mam - li neutron source, computing the total uranium fission neutron count rate and time distributions of 42 3he tubes, and calculating the neutron coincidence counting rate
第一步,以ain ? li源為中子源,計算
鈾的誘發裂變中子產生二率及空間分佈;第二步,以
鈾的誘發裂變中子為中子源,計算化根』 ne管
的總中子計數率及時間分佈;第三步,計算中子符合計數率。
Bhp billiton, on the other hand, has largely stood aside from the merger frenzy save for the acquisition of wmc resources, an australian nickel and uranium miner, for $ 7 billion in 2005
而另一方bhp ,早已經遠遠地避開了收購
的狂潮,因為其在2005年為了收購澳大利亞
的一家開采鎳和
鈾的公司而花費了70億美元。
Standard test method for the determination of uranium by ignition and the oxygen to uranium atomic ratio of nuclear grade uranium dioxide powders and pellets
用點火和核級二氧化
鈾粉末和顆粒
的氧
鈾原子比測定
鈾的標準試驗方法
To explain this point i prepared synthetic chalcolite from pure products, and obtained crystals, whose activity was completely consistent with their uranium content ; this activity is about half that of uranium
為了解釋這一現象,我準備了從純產品中合成
的銅
鈾雲母,並得到了這種結晶體,其活性與其
鈾含量完全一致,活性大約是
鈾的活性
的一半。
Standard guide for pyrophoricity combustibility testing in support of pyrophoricity analyses of metallic uranium spent nuclear fuel
通過對燃燒核燃料
的金屬
鈾的自燃分析進行自燃易燃性試驗
的標準指南
North korea broke its 1992 denuclearization agreement with its brethren in the south, which included explicit provisions not to possess nuclear reprocessing and uranium enrichment facilities
?北韓違反了1992年同韓國簽署
的無核化協議。該協議明文禁止建立核再處理設施和提煉濃縮
鈾的設施;
Nuclear fuel technology - determination of uranium in reprocessing - plant dissolver solution - liquid chromatography method
核燃料技術.預處理廠溶解器溶液中
鈾的測定.液相色譜法
Analytical determination of uranium in ash of biological samples - solid fluorimetry
生物樣品灰中
鈾的測定固體熒光法
Hearings on namibian uranium
關于納米比亞鈾的聽詢會