X射线荧光测井井液的影响与校正     

葛良全  周四春  谢庭周  章晔  程业勋  侯胜利 《物探化探计算技术》1996,(S5)

X射线荧光测井中 ,井液位于井下探管与井壁之间 ,它的影响不但表现在对特征X射线的吸收 ,而且表现在对源初级射线和特征 X射线的散射。井液的校正采用硬件与软件相结合的方法 ,在硬件上 ,使含有探测器的部分制成单独的短臂 ,有效地保证了探测窗与井壁的良好接触 ;在软件上 ,提出的双散射峰法和散射峰 -逃逸峰法 ,能够校正 0 - 10 mm厚的井液对 X射线荧光测井结果的影响  相似文献   

Surface chemical analysis in coal preparation research: complementary information from XPS and ToF-SIMS     

A. N. Buckley  R. N. Lamb 《International Journal of Coal Geology》1996,32(1-4)

The application of X-ray photoelectron spectroscopy (XPS) to coal surface characterisation for preparation research is described. Progress towards the acquisition of complementary surface chemical information by time-of-flight secondary ion mass spectrometry (ToF-SIMS) is also discussed. Surface-based beneficiation techniques such as flotation are assuming greater importance as the proportion of fines in raw coal increases due to the proliferation of high capacity mining methods. A necessary condition for the floatability of a coal particle is adequate hydrophobicity, and the degree of hydrophobicity of the flotation concentrate is one factor influencing the ease with which its dewatering can be affected. The hydrophobicity of a coal is very difficult to measure directly because of microporosity, and it is often necessary to deduce the degree of hydrophobicity from a knowledge of the surface chemistry. XPS is able to provide sufficient analytical data to allow relative levels of hydrophobicity to be estimated. In principle, ToF-SIMS should be able to supply additional information enabling refinement of such estimates; however, there are insufficient data at present to allow the ionic fragments detected to be related to specific functional groups at the coal surface.  相似文献   

X射线荧光测井的井液效应及其校正     

伍岳  林玉飞 《铀矿地质》1996,12(1):41-47

本文从Ｘ射线的性质，以及Ｘ射线与物质作用的机理出发，对井液效应进行了研究，并对其影响过程进行模拟。在理想井液模型上，推导出Ｘ射线活度与钻孔参数的数理关系。在此基础上，进一步研究得到了能适应野外多变情况的井液效应校正公式（ＣＢＷＥ）和方法。  相似文献   

原位磁化X射线粉末衍射法测还原铁粉的微观磁致伸缩系数     

罗新  刘世雄 《华东地质学院学报》2004,27(2):178-180

首次报导X射线粉末衍射法测量铁粉晶胞的磁致伸缩系数。还原铁粉样品原位磁化后 ,铁立方晶胞产生磁致伸缩效应 ,晶胞参数的变化引起衍射峰位置和晶面间距的变化。实验测得铁晶胞λ1 0 0 为 3 .3 3× 10 - 4,此结果表明铁晶胞的微观磁致伸缩系数比棒状、薄膜或粉末压片的系数大约 16倍。对此现象进行了合理的理论解释 ,指出大块材料中的粉末多晶之间具有较大的空隙 ,从而使得宏观磁致伸缩系数变小  相似文献   

CHARACTERIZATION OF DEFORMATION AND X-RAY PETROFABRICS IN THE MIDDLE PART OF THE WAHONGSHAN FAULT ZONE, QINGHAI PROVINCE, NORTHWESTERN CHINA     

ZHANG Shuanhong  ZHOU Xianqiang 《大地构造与成矿学(英文版)》2004,28(1):53-65

The Wahongshan fault zone in Qinghai province is one of the most important faults in westem China. In this paper, deformation and X-ray petrofabrics have been studied in the middle segment of the fault. The results show that the formation of the fault zones can be divided into two major stages: ductile shear deformation stage and brittle deformation stage. The early stage ductile shearing leads to the formation of the NW-NNW trending mylonite zones along the fault, which is intensely cut by the late-formed brittle faults. X-ray petrofabrics of rocks near the faults indicate that the minerals in the tectonites show a great degree of orientation in the alignment. The quartz, which is a very important mineral in the tectonites, is deformed by basal face gliding or near basal face gliding, and sometimes by prismatic face sliding, which indicates that the rocks are deformed in epithermal to mesothermal or mesothermal environment, and the dynamic recrystallization also plays an important role in the formation  相似文献   

2004欧洲X射线光谱分析会议     

罗立强 《岩矿测试》2004,23(4):285-286

介绍了2004欧洲X射线光谱分析会议的简况和会议所讨论的热点问题。利用聚合毛细管X射线透镜进行微区分析是近期X射线领域最受关注的热点。  相似文献   

能量色散X射线荧光光谱法测定卤水中痕量溴铷砷   总被引：3，自引：4，他引：3  

樊兴涛  詹秀春  巩爱华 《岩矿测试》2004,23(1):15-18

用模拟卤水建立了能量色散X射线荧光光谱法测定卤水中溴、铷、砷痕量元素含量的方法.实验表明,方法可以直接取样测定,适用于大批量样品的测试分析.方法的精密度RSD(n＝15)小于1%,加标回收率为86.8%～101.6%.卤水中溴、铷、砷的测定结果与比色法、原子吸收和原子荧光法结果相符.  相似文献   

高倍稀释熔融制样X射线荧光光谱测定钨砂和铬铁矿中主含量   总被引：4，自引：5，他引：4  

吴秀兰  朱明达  张志峰  王伊琴 《岩矿测试》2004,23(1):73-74

用X射线荧光光谱测定钨砂中WO3和铬铁矿中Cr2O3,通过高倍稀释熔融玻璃片制样法,采用高纯WO3或Cr2O3作单一标准样测量X射线荧光强度计数,然后同未知样品测量所得X射线荧光强度计数相比,即可计算出WO3和Cr2O3的测量值.方法用于钨砂矿和铬铁矿中WO3和Cr2O3的测定,结果与标准值相符.  相似文献   

北京市春夏季大气气溶胶的单颗粒分析表征   总被引：9，自引：0，他引：9  

肖锐刘成德  梁汉东董树屏 F．Adams 《岩矿测试》2004,23(2):125-131

采集了北京市2000年春夏季大气气溶胶样品5个，采用扫描电镜X射线能谱技术分析大气气溶胶单颗粒约2500个。研究结果表明，沙尘期间，矿物尘是最主要的颗粒物种类，非沙尘期间，北京市大气气溶胶中主要检出矿物尘和含硫颗粒物。夏季随着颗粒物污染的加重，含硫颗粒物的数目百分数增加。是北京市大气颗粒物污染的重要特征。重点讨论了Ca-S颗粒、K-S颗粒和Ca-K-S颗粒三类典型含硫颗粒物的化学组成和粒径分布特征。数目可观的Ca-K-S颗粒以及其他硫酸盐颗粒的生成与相对湿度和云量等气象条件相关，这些颗粒物可能是云中过程的产物。减少SO2排放，减少含硫颗粒物，对于控制北京市的大气颗粒物浓度水平具有重要意义。  相似文献   

广东茂名高岭土煅烧实验研究   总被引：1，自引：0，他引：1  

朱粉利  曾伟能  王勤燕  周汉文 《矿产与地质》2004,18(2):168-172

对茂名高岭土进行煅烧，结合X-射线衍射、扫描电子显微镜分析，得到了茂名高岭土在不同温度点煅烧的性能参数，并确定出其非晶化转变的温度是550℃。同时对煅烧过程中的煅烧温度、恒温时间等影响因素进行探讨，结果表明，在茂名高岭土的煅烧过程中，适当延长恒温时间可降低非晶化转变的温度，缩短恒温时间，则非晶化转变温度升高。  相似文献