Morphological types of industrial uranium deposits and methods for their prospecting

The grouping of uranium deposits according to the combination of their morphological features is proposed. Five groups of deposits are distinguished, for each of which the following are examined: the prospecting system, the most efficient ratio between mining and drilling operations, the density of the prospecting network and the conditions for the classification of reserves.     

用于核材料检测的两种宇宙射线μ子位置灵敏探测器

简要介绍利用天然宇宙射线μ子作为射线源来探测隐匿核材料的原理,两种适用于探测隐匿核燃料的位置灵敏探测器:漂移管(DT)和阻性板(RPC),对其在探测核材料上的主要性能作了对比、分析.     

两种大面积塑料闪烁探测器的性能对比及工艺设计

介绍了塑料闪烁探测器的基本组成和工作过程,针对两种不同尺寸、型号的大面积塑料闪烁探测器性能参数进行了对比.简单介绍了整体探测部件的工艺设计.     

Two types of MeV ion beam enhanced adhesion for Au films in SiO2

The ion beam-enhanced adhesion of thin Au films on vitreous silica sus studied for a wide range of Cl ion beam doses for beam energies between 6.5 MeV and 21.0 MeV. Since the residual adhesion of Au on SiO₂ is low, the improved adhesion can be easily seen using the Scotch Tape Test. The threshold in the enhanced adhesion corresponding to passing the tape test occurs at two different dose ranges for a given energy; one at very low dose centered around 1 × 10¹³ /cm², the other at higher doses with a threshold of around 1.5 × 10¹⁴ /cm² (depending upon the beam energy). At low doses (2 × 10¹² to 5 × 10¹³ /cm²) surface cracks occur on the SiO₂ substrates, these cracks close up at doses higher than 5 × 10¹³ /cm². A possible explanation of enhanced adhesion in the low dose range is associated with the surface crazing of the SiO₂ substrate. To make the adhesion test more quantitative, a scratch test was also used on the samples.     

快重离子束引起的Cu-Si膜系的两种不同类型的增强附着效应

对沉积在N型半导体硅上的Cu薄膜用几MeV的Cl离子进行了不同剂量的辐照实验以观测其增强附着行为。结果表明,Cu-Si膜系存在两种不同类型的增强附着效应。用扫描电镜对低剂量轰击出现附着增强区域的硅基底表面进行观察,未发现任何微裂现象。这与人们在解释Au-SiO_2膜系出现类似增强附着时提出的微裂观点不相符合。     

Two types of a passive safety containment for a near future BWR with active and passive safety systems

The paper presents two types of a passive safety containment for a near future BWR. They are named Mark S and Mark X containment. One of their common merits is very low peak pressure at severe accidents without venting the containment atmosphere to the environment. The PCV pressure can be moderated within the design pressure. Another merit is the capability to submerge the PCV and the RPV above the core level. The third merit is robustness against external events such as a large commercial airplane crash. Both the containments have a passive cooling core catcher that has radial cooling channels. The Mark S containment is made of reinforced concrete and applicable to a large power BWR up to 1830 MWe. The Mark X containment has the steel secondary containment and can be cooled by natural circulation of outside air. It can accommodate a medium power BWR up to 1380 MWe. In both cases the plants have active and passive safety systems constituting in-depth hybrid safety (IDHS). The IDHS provides not only hardware diversity between active and passive safety systems but also more importantly diversity of the ultimate heat sinks between the atmosphere and the sea water. Although the plant concept discussed in the paper uses well-established technology, plant performance including economy is innovatively and evolutionally improved. Nothing is new in the hardware but everything is new in the performance.     

Thermal properties of plasma-sprayed tungsten deposits

Tungsten powder was plasma-sprayed onto a graphite substrate in order to examine the microstructures, porosities, and thermal conductivities of tungsten deposits. Tungsten was partially oxidized to tungsten oxide (WO₃) after plasma spraying. Most pores were found in the vicinity of lamellar layers in association with oxidation. It was revealed that both tungsten oxide and the lamellar structure with pores have a significant influence on the electrical and thermal conductivity.     

Prospecting criteria for uranium deposits

The author discusses criteria which can be used for assessing the possible occurrence of uranium in a particular region and for prospecting for uranium deposits and individual ore bodies.Deceased.     

干盐湖石膏的ESR年龄测定

本文报道了两个钻孔岩芯11个石膏样品的ESR年龄测定结果,并对讯号的选择及数据的可靠性进行了讨论。     

居隆庵铀矿床地温场特征

居隆庵铀矿床位于相山铀矿田西部,为我国大型火山岩型铀矿床之一。通过分析大量钻孔测温和水文地质资料,得出地温场与温热水的分布、断裂构造、深大断裂、富大铀矿及铀矿化在空间分布上具—致性。温热水的活动场、水热围岩蚀变和化学成分特征是铀矿找矿的标志。     

中央亚洲活动带及邻区砂岩型铀矿床主要类型、铀成矿特征及在我国西北地区找矿方向的探讨

以产铀盆地所处大地构造位置、形成演化及铀矿化成因特征为基础,将中央亚洲活动带及邻区主要砂岩型铀矿床分为5种类型,分析了不同类型铀矿床的分布规律,对其产出构造地质背景和铀矿化特征进行了讨论,指出了我国西北地区盆地动力学的特征、主要找矿类型和含矿层位。     

中亚砂岩型铀矿成矿特征及其在我国的找矿思路

介绍了前苏联发明创造地浸法采铀后,中亚砂岩型铀矿一跃成为具有世界级铀成矿域和铀矿工业类型的地区。其铀储量达百万吨之巨;论述了中亚砂岩型铀矿是地台活化区次造山带层状氧化带成矿。并简要论述其区域成矿特征,最后提出了在我国开展砂岩型铀矿的找矿思路。     

澳大利亚铀矿新进展

重点介绍了澳大利亚的铀矿勘查、开采和环境监控的新进展。铀矿勘查是在北部的阿纳姆地始元古代沉积变质的厚砂岩盖层下面寻找与不整合面有关的矿床。在南澳大利亚州布罗肯希尔地区的赤铁矿角砾岩中的勘探发现了铜、金、铀、稀土矿化。还提出奥林匹克坝、兰杰、贝弗利、密月和贾比卢卡铀矿床、铀矿开采和环境监控方面的新进展。     

PIXE analysis of nephrite minerals from different deposits

External-beam PIXE was used to determine the major, minor and trace elements of 45 nephrite minerals from 14 different deposits, including China and other countries. Depending on the R^∗ value (mole percent of Mg²⁺/(Mg²⁺ + Fe²⁺⁽³⁺⁾)) and content of Cr, Co and Ni, two types of nephrite minerals from dolomite and serpentinized ultramafic deposits can be more accurately distinguished. Besides, the nephrite minerals from Xiaomeiling and Wenchuan deposit can be distinguished with others from dolomite deposits, through the content of Sr and Mn/Fe value, respectively. Moreover, depending on the Sr content, clear evidence was given to prove that the raw materials of ancient nephrite artifacts from Liangzhu culture ruins are not from Xiaomeiling nephrite deposit. Furthermore, PIXE as a non-destructive method will be more used to study ancient nephrite artifacts, so these results can provide scientific basis for seeking the provenance of nephrite raw materials.