natural background radioactivity

用法例句

Studies on natural radioactivity of soil in Xiazhuang uranium ore field, Guangdong;

广东下庄铀矿田土壤的天然放射性研究

Environmental survey and assessment of natural radioactivity for a certain area of Jiangsu province

江苏省某地区天然放射性环境调查与评价

Considering the need in environmental natural radioactivity measurement,a series of Secondary Certified Natural Radioactivity Environment Reference Materials——GBW(E)040012～GBW(E)040015 were prepared according to Technical Specification of Primary Reference Material.

为满足国内天然放射性检测工作的需要,参照国家一级标准物质技术规范,研制了系列天然放射性环境分析标准物质,包括铀-镭,钍,钾及铀、镭、钍、钾混合标准物质共4种,已于2004年批准为国家二级标准物质GBW(E)040012~GBW(E)040015。

extinct natural radionucleus

消失的天然放射性核

secondary natural radionuclides

次生天然放射性核素

extinct natural radionuclides

消失的天然放射性核素

induced natural radionuclide

感生天然放射性核素

INVESTIGATION OF NATURAL RADIOACTIVITY LEVEL OF THE WATERS IN BAOTOU AREA

包头地区水体中天然放射性水平调查

Natural radioactivity contains a store of valuable information.

天然放射性包含着许多有价值的信息。

The Monte Carlo Stimulation of Natural Radial γ Energy Spectrum;

天然放射性场γ能谱的蒙特卡罗模拟

Analysis of natural radioactivity level of the typical fly ash from guizhou province

贵州典型粉煤灰天然放射性水平分析

Crude Radioactivity Measure of Coal Dust Based on HPGe γ-ray Spectrometer

基于HPGeγ谱仪的粉煤灰天然放射性测量

Survey on Natural Radiation of Coal Ash and Slag in Xiaolongtan Power Plant

小龙潭电厂煤灰渣天然放射性调查研究

Determination of Uranium, Thorium and Potassium Elemental Concentrations in Surface Soils in Suzhou;

苏州市土壤~（238）U、~（232）Th、~（40）K天然放射性水平调查

Environmental survey and assessment of natural radioactivity for a certain area of Jiangsu province

江苏省某地区天然放射性环境调查与评价

Natural specific activety in building materials and dose estimation

郴州地区建材天然放射性水平及其剂量估算

Estimation of Natural Terrestrial External Exposure Levels of Nuclides in Soils in Chengdu

成都市土壤天然放射性核素的外照射水平估算研究

Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.

α粒子是从天然放射性蜕变得到的带正电的氦核。

APPLICATIONS OF NATURAL ISOTOPES OF ~7Be AND ~(210) Pb IN ATMOSPHERIC SCIENCE

天然放射性核素铍-7和铅-210在大气示踪研究中的应用

Natural Radioactive Nuclide Level of the Agricultural-animal Products and Annual Comunity Intake in Lanzhou City;

兰州市农畜产品天然放射性核素含量水平与公众年摄入量

The investigation and analysis on natural radioactivity nuclide specific activity of cement product in china

我国水泥产品天然放射性核素比活度的调查分析