In analyzing the neutron active detection, the neutron multiplication in the nuclear warheads induced by outer neutron source with different neutron energys is studied with numeral simulation, and the feasibility of through counting neutrons to determine the presence of high enrichment uranium ( heu ) in nuclear warhead has been proved. the method of detecting the warhead which contains heu pit by counting the released neut rons whose energy is higher than that of source neutron is studied. the feasibility of this method has been studied
對幾種主動探測
核彈頭方法進行的研究中,首先對不同能量各向同性外源中子照射
核彈頭的中子增殖行為進行了數值模擬,檢驗了用外源中子照射
核彈頭后,通過測量瞬發中子在
核彈頭中的增殖量,來證明
核彈頭中高濃
鈾存在的可行性;研究了用能量低於1mev的外中子源照射
核彈頭,用測量
核彈頭中裂變產生的高於源中子能量中子數的方法探測
核彈頭,通過數值模擬分析了可行性。
China has supported the agreed framework ; yet north korea has said that it considers that framework " nullified. " china is a state party to the nonproliferation treaty ; yet north korea - also a member - has clearly violated its npt commitments with its covert uranium enrichment effort
中國支持《
核框架協議》 ,但是北韓自稱這個協議已經「無效」 。中國是《不擴散條約》的簽字國,然而北韓它也是成員國暗中提煉濃縮
鈾,顯然違反了對《不擴散條約》的承諾。
Determination of the oxygen uranium ratio in uranium dioxide nuclear fuels
二氧化
鈾核燃料中氧
鈾比例的測定
However, the actual weight of uranium or plutonium in such a weapon is greater than this amount.
可是,在一枚那樣的
核武器中,
鈾或鈈的實際重量要比這個數字大得多。
The transuranic elements especially the minor actinides ( ma ) in spent fuel represent potential environmental radiotoxicity hazard in the long term
核電站乏燃料中超
鈾核素,特別是其中的少數錒系
核素( minoractinides ,簡稱ma ) ,對環境具有潛在長期放射性危害性。
This paper introduces the latest progress of high level radioactive waste disposal programs in the world, and discusses the key scientific issues as follows : ( 1 ) the precise prediction of the evolution of a repository site ; ( 2 ) the characteristics of deep geological environment ; ( 3 ) the behaviour of deep rock mass, groundwater and engineering material under coupled conditions ( intermediate to high temperatures, geostress, hydraulic, chemical, biological and radiation process, etc ) ; ( 4 ) the geochemical behaviour of transuranic radionuclides with low concentration and its movement with groundwater : and ( 5 ) the safety assessment of disposal system
在介紹國內外最新研究進展的基礎上,重點討論高放廢物地質處置的若干關鍵科學問題:處置庫場址地質演化的精確預測、深部地質環境特徵、多場耦合條件下(中(高)溫、地殼應力、水力作用、化學作用、生物作用和輻射作用等)深部巖體、地下水和工程材料的行為、低濃度超
鈾放射性
核素的地球化學行為與隨地下水遷移行為及處置系統的安全評價。
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。
Standard specification for nuclear - grade uranyl nitrate solution or crystals
核純級硝酸
鈾酰溶液或晶體的標準規范
Standard test methods for chemical, mass spectrometric, spectrochemical, nuclear, and radiochemical analysis of nuclear - grade uranyl nitrate solutions
核純級硝酸
鈾酰溶液的化學的質譜的光譜化學的
核
Specification for nuclear grade sinterable uranium dioxide powder
核級可燒結二氧化
鈾粉末技術條件
Standard specification for nuclear - grade, sinterable uranium dioxide powder
核純級的可燒結二氧化
鈾粉末標準規范
Recent development of novel superconductive materials
二氧化
鈾核燃料芯塊燒結工藝的發展概況
Quality control for plate - type uranium - aluminum fuel elements
片狀鋁
鈾核燃料元件的質量控制
Physicists investigating heavy - particle collisions believe they are on the track of a universal form of matter, one common to very high energy particles ranging from protons to heavy nuclei such as uranium
研究重粒子對撞的物理學家相信,他們正在尋找某種物質的普遍結構,也就是尋找一種從質子到重
核(如
鈾核)的超高能粒子共同結構。
Determination of the u isotopic content in uranium containing nuclear fuel solutions by spectrometry
光譜分析測定含鈾核燃料溶液中鈾235同位素含量