共查询到18条相似文献,搜索用时 63 毫秒
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中子活化分析对河南南阳独山玉的研究 总被引:3,自引:0,他引:3
应用中子活化分析法对河南南阳独山玉的稀土微量元素进行了研究 ,结果表明 :白独玉、绿独玉与黑独玉的地球化学特征有明显的差别。其中 ,它们每种玉的平均值 :8个稀土总量 (8∑REE)分别为 1.4 5、6 .895、3.86 7μg·g- 1;全线斜率 (La/Yb)分别为 14 .2 77、4 .936、0 .84 9μg·g- 1;微量元素Sr分别为 75 4、4 34、115 μg·g- 1,Cr分别为 5 .5 3、10 95、85 1μg·g- 1,Fe分别为 2 777、2 838、2 875 0 μg·g- 1,Mn分别为 6 8、6 5 .5、5 32 μg·g- 1;绿独玉正Eu异常最大 ,而黑独玉的正Eu异常最小。这些特征可作为鉴别独山玉的地球化学标志 ,对考古及古玉的深入研究与鉴别具有重要意义。 相似文献
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马鑫培 《核化学与放射化学》1990,12(4):225-229
一、 引言 祖母绿宝石是普通矿物绿柱石或绿玉的一种。它的化学分子结构可以表示为:Be_3Al_2(SiO_3)_6=(BeO)_3+(Al_2O_3)+(SiO_2)_6。从分子结构计算三个主体组份的含量BeO约占14%,Al_2O_3约占19%,SiO_2约占67%。在祖母绿宝石结晶生长的过程中,这些主体元素组份可以部份地被一些微量元素所替代。替代元素的含量和元素间浓度的分布状况既给出祖母绿宝石的特征,又是形成此矿物所处地质化学和地质物理环境的指证。祖母绿宝石突出的特征是替代元素Cr使它呈现美丽的绿色。当受到质子束轰击时,样品的靶点上被激发出浓艳的红色荧光。祖母绿宝石微量元素组份的测定可提供此矿物来源地的地质环境的有价值资料。这些资料有可能指明宝石的产地,从而对于确定宝石本征价值以及人造宝石是否 相似文献
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在IBM微机上建立了PIXE实验的数据采集系统和数据分析系统,并对气溶胶等样品进行了PIXE实验分析研究,取得了满意的结果。 相似文献
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一、引言营养卫生学的研究中,痕量元素日益受到人们的重视。为了保证人体对于15种必需痕量元素的补充以及保证毒性元素的摄入在允许剂量之内,从痕量元素含量角度来研究食品和饮料的质量是很重要的。PIXE提供了多种痕量元素含量的同时测定方法。啤酒中微量元素很丰富。啤酒的颜色,芳香,味道和储存质量都和所含微量元素的浓度有关。 相似文献
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股骨头松质骨中无机元素的PIXE分析 总被引:4,自引:0,他引:4
使用质子激发X射线荧光分析技术测定了5例正常人和7例股骨颈骨折患者股骨头松质骨中无机元素谱的分布。详细介绍了骨样品处理技术,建立了正确测定骨骼微量元素的定量方法。结果表明在对照组中元素P、Ca、Fe、Cu、Sr的含量高于病变组,统计检验表明有显著意义,而元素S、K、Mn、Zn在两组间无显著差异。对Ca、P、Sr、Cu等无机元素的生理功能进行了初步的讨论。 相似文献
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江西湖田窑明代青花瓷的PIXE研究 总被引:3,自引:0,他引:3
用现代科学技术对中国古瓷的产地、年代和真伪进行研究一直是文博界和科技界研究的热点.本工作采用质子激发X射线发射(PIXE)分析方法研究了江西湖田窑明代中晚期青花瓷的胎、釉和青花中主量、微量元素的含量,并用质子扫描微探针(SPM)分析了青花瓷剖面的元素分布.结果表明元素在古瓷的釉、胎和青花中的分布都是均匀的;胎与青花之间有5~10 μm的中间层,青花与白釉之间无明显的分界线;制作青花的钴料可能产于江西、福建等地. 相似文献
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采用质子激发X射线荧光法(PIXE)分析生物,医学及环境等样品时,都要涉及到厚靶的分析。通常,靶都制得很薄,即所谓的薄靶(对2.0MeV的质子束,靶厚小于1mg/cm~2),这可使对样品中各元素含量的计算简单,但其计数效率太低。为了提高效率而又节省用机时间,希望将靶制得稍厚一些,即所谓厚靶(靶厚大于1mg/cm~2),这时就必须考虑质子束通过靶层时能量损失所引起的特征X射线产生截面的变化,以及靶不同深度处产生的特征X射线穿出靶时因吸收而致的强度减弱。本文主要介绍从理论上对未考虑上述影响的薄靶计算公式的修正问题,并通过对标准桃叶的测量来验证这一计算方法的可靠性。 相似文献
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V. John Kennedy A. Augusthy K. M. Varier P. Magudapathy S. Panchapakesan V. Vijayan K. G. M. Nair 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》1999,150(1-4):277-281
Proton induced X-ray Emission (PIXE) has been used to measure the trace metals especially heavy metals in Chaliyar river water samples to assess the impact of pollutants from the industrial wastes. Water samples were collected in summer and rainy seasons from three different depths along the course of the river. Measurements were carried out with 2 MeV proton beam using a 3 MV tandem pelletron accelerator at Institute of Physics, Bhubaneswar. Results from the water Samples collected in both the seasons show that the concentrations of certain heavy metals like Hg, Zn and Pb are more than the prescribed limits. This is because of pollution due to industrial wastes, indicating a need for improvement in the industrial waste treatment. 相似文献
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R. Ashok Kumar V. John Kennedy K. Sasikala A. L. C. Jude M. Ashok Ph. Moretto 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2002,190(1-4):449-452
The accelerator based ion beam analysis method of proton induced X-ray emission (PIXE) has been used for analysing up to 14 elements in the blood serum of patients, collected from rehabilitation centres for the mentally retarded and from Medical College Hospital, Coimbatore, Tamil Nadu, India. The experimental subjects of the different groups displayed significant variations in their levels of certain trace elements such as zinc, iron, copper, phosphorus, chlorine, and rubidium. The results are compared with those of healthy control subjects and are discussed in detail in this paper. Hence, PIXE as a method of trace element analysis can be used to determine trace element content in mentally challenged patients. 相似文献
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L.J. JisonnaP.A. DeYoung J. FerensC. Hall J.M. LunderbergP. Mears D. PadillaG.F. Peaslee R. Sampson 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2011,269(10):1067-1070
The elemental concentrations of five trace elements in tempered sheet glass fragments were determined using particle-induced X-ray emission (PIXE) spectrometry. The trace element concentrations for calcium, iron, manganese, strontium, and titanium are compared to those obtained by inductively-coupled plasma-atomic emission spectrometry (ICP-AES) following complete digestion by hydrofluoric acid. For these five elements, the absolute concentrations obtained by both methods are shown to agree well over a wide range of concentrations. The limits of detection for trace elements are typically lower for the ICP-AES method. However, we show that the concentrations of these five elements can be accurately measured by the PIXE method. Since PIXE is an entirely non-destructive method, there exists a niche for this technique to be used as a complement to the more sensitive ICP-AES technique in the forensic analysis of sheet glass. 相似文献