查询词典 radon

Intelligent nuclear instrument has been a dominant developing direction of radioactivity measurement instrument. The instrument for radon measurement of air pulse ionization chamber, based on the theory that alpha rays decayed by radon and its progeny can ionize the air molecules, can measure the radon concentration accurately.

智能核仪器已成为放射性测量仪器发展的一个主导方向，利用氡及其子体衰变放出α射线能使空气分子电离的理论设计的空气脉冲电离室α测氡仪可以准确地测量空气中的氡浓度。

Male Wistar rats were exposed daily to radon at a concentration of 100,000 Bq/m(3) for 16 h, and then exposed to 20% cigarette smoke for 1 h for a period of 75 d, with the radon cumulative dose reaching 200 WLM.

雄性Wistar大鼠每日暴露在浓度为100，000Bq/m(3)的氡中16小时，然后暴露在20％的香烟烟雾中1小时，为期75天，氡累积剂量达到200WLM。

According to the theory of flow diffusion and convection, three-dimensional state equation of radon field is established for constant and variable diffusion coefficient and convection rate. The numerical solutions for different coefficient and different boundary conditions are obtained for two models of radon field which have respectively source in the side and inside of collapse column.

根据流体场的扩散理论和对流理论，建立了扩散系数与对流速度为常量或变量情况下的氡气场三维状态方程；对於陷落柱柱体侧面有源氡气场和柱体体内有源氡气场两种理论模型，给出了不同系数和边界条件下的数值解的形式。

Can form plenty of graphic images on Golden/ Slivery paperboard、 PET、 radon velum, it can have the effects like refraction veins, frosting veins, ice crystal, partial flower pattern, radon veins, three-dimensional cartoon.therfor it is a best choice for top-grade wine cases、drug and cosmetic package 、wall calendar、advertising poster、 gift etc.

折光压纹机属于无油墨，环保型的包装设备，能在金银卡纸、PET、镭射膜等包装产品上形成折光纹、磨砂纹、冰花、局部花纹、镭射纹、三维动画等效果，最适用于高档酒盒、药品、化妆品等包装及年画、挂历、广告宣传画等工艺品印刷，是当今包装印刷业的好帮手。

The effect of Radon in air on human health has been paid wide attention. The measurement and control of radon involves many different subjects, however, to measure Radon precisely is the precondition to make defense measures.

空气中氡对人体健康的影响已经引起广泛关注，对氡的测量和控制是多个学科共同关心的问题，然而，准确测量氡是采取防护措施的前提。

Some conclusions are drawn:instrument of the digital measure of radon must be standardized and only standardized by flow through radon gas source;gas flux of entering the scintillation chamber should be controlled or measured in the process of digital measure of radon.

指出对测氡仪器必须进行标定，而且必须用流通式氡气源来标定；在观测中应控制或测定进入闪烁室的气体流量。

This paper consults the key technology in the radon measurement device in the national and international and we thinks over the characteristic of α-ray which emit by radon and its daughter, so that decides to use the α-ray spectrum to measure radon.

论文从测量氡及其子体放射出的α射线入手，瞄准国内外测氡装置关键技术发展趋势，结合氡及其子体α能谱测量特点，采用α能谱测氡的途径来完成这一工作。

The radon concentration rises with depth which may be distorted by radon daughters and thoron .(2). Seasonal temperature influence free radon of soil only.

季节温度仅对壤中活动氡运移有影响，对束缚氡影响小；认为温度梯度也是引起空气中氡浓度日变的一个因素；（3）。

Radon and thoron calibration factors are 1.78 and7.63 respectively , the relative error of radon concentration ERS-2 measured is 3.0%compared to the standard radon concentration and thoron is 3.2%. We deduced theequations which can eliminate the mutual interference between radon and thoronmeasurement .

通过 ERS—2 氡析出率仪器的研究，对 ERS—2 测量析出率中道址的选择以及扣除氡钍干扰问题进行了讨论，氡道道址设置为 60—115，钍道道址设置为 119—128，氡钍的刻度系数分别选为 1.78 和 7.63，测得的氡浓度与标准氡浓度的相对误差为 3.0%，测得的钍射气浓度与标准钍射气浓度的相对误差为 3.2%。

Six field measurement sections with dozens kilometers were performed with a real-time radon gauge and a air radon gauge , financed by Chinese Geological Survey. The results show that the Radon concentration is 6.7 Bq/L in field soil and 16.7 Bq/m3 in the air .

在中国地质调查局&四川成都经济区域城市生态地球化学评价&项目的成都市地空界面氡浓度的调查与评价实践中，进行了大量的实验和野外测量，结果表明成都市原野壤中氡浓度水平平均值为6.7Bq/L，空气中平均氡浓度为16.7 Bq/m~3，土壤中氡浓度整体是西部和东部偏高。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。