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- natural radioactive series 天然放射系
- Radon and its daughters not only are the decay product of natural radioactive uranium series and thorium series, but also are one of natural radiation source. 氡及其子体是天然放射性系列中的铀系、钍系衰变产生的,是人类受天然辐射主要的来源之一。
- An Investigation on Natural Radioactive Lev-els and Their Distribution in Liangshan Regi-on, Sichuan Province. 凉山州天然放射性水平及其分布
- Alpha particles are positively charged helium nuclei obtained from natural radioactive decay. 粒子是从天然放射性蜕变得到的带正电的氦核。
- As a product from the uranium disintegration, radon is a natural radioactive idle gas. 氡是天然放射性惰性气体,是铀系衰变链中的一个衰变产物。
- Polonium is a naturally radioactive metallic element. 钋是一种具有天然辐射性的金属元素。
- This paper summarizes the quality assurance work of external exposure mea-surement for national survey of environmental natural radioactive level. 本文总结了全国环境天然放射性水平调查外照射测量的质量保证工作。
- A report is made on the results of analysis the content of natural radioactive nuclide in 33 samples of building stone commonly used in South Fujian. 报道闽南常用石材的33个样品中,天然放射性核素含量的分析结果,并按照国家有关石材产品分类标准进行划分。
- No colour and no smell, arising from the decay of radium, is the only natural radioactive inert natural gas, the proportion is 7.5 times the air. 没有颜色也没有任何气味,由镭衰变而产生,是自然界惟一的天然放射性惰性气体,比重是空气的7.;5倍。
- Abstract The discovery history of Polonium and Radium are briefly retrospected here at the 110th anniversary of these natural radioactive elements discovery. 摘要 在天然放射性元素钋和镭发现110周年之际,简要回顾了这两种元素的发现史.
- KREEP rocks formed at the boundary of lunar crust and mantle, and natural radioactive thorium is one of the elements to demonstrate KRREP rocks distribution. 月球KREEP岩石形成于壳幔的分界层中,天然放射性元素Th是指示KREEP岩分布的主要元素之一。
- Two test methods, natural radioactive background method and decay method, used to verify the detection limit of radioactive aerosol monitors are studied. 两种方法不仅可检测监测仪的探测限,而且对各种监测仪探测限指标的物理意义能给以正确判断。
- Natural radioactivity contains a store of valuable information. 天然放射性包含着许多有价值的信息。
- A naturally radioactive, silvery, metallic transuranic element, occurring in uranium ores and produced artificially by neutron bombardment of uranium. 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。
- A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens. 碳4:一种碳的天然放射性同位素,原子量为4,半衰期为5,780年,用于测定古代生物标本,地质标本或考古遗迹的标本的年代
- natural radioactive radiation level 天然放射性辐射水平
- Keywords Construction materials;Natural radioactive nuclide;Niton; 建材;天然放射性核素;氡;
- It is natural for a cat to catch mice. 猫捉老鼠是本能。
- It's natural to slack2 off towards the end of a hard day's work. 一天紧张工作快结束的时候有些放松是自然的。
- Many natural materials are becoming scarce. 许多天然原料越来越少。