溴氧化镧：铽增感屏

本文扼要阐述了与医用X线皎片匹配使用的荧光增感屏的结构和主要性能,如:增感效率、分辨率、光谱特性、余辉等,阐明了稀土元素增感屏较之传统的钨酸钙增感屏的种种优越性,重点介绍了目前应用最多的稀土元素荧光粉——溴氧化镧:铽的制备方法和特性,并列举了有关试验数据。     

医用S/F系统感绿胶片技术动态

感绿胶片／稀土增感屏系统可大大降低射线剂量。这主要是由于稀土增感屏比钨酸钙增感屏有较高的Ｘ线吸收效率及转换为可见光的效率。感绿的屏／片体系显示了细微的影像颗粒，具有较高的解像力。这主要是由于感绿片采用了Ｔ颗粒技术及抗交迭效应技术，提高了乳剂对荧光的吸收，同时防止交迭光的散射危害。     

T颗粒X线胶片和矽肺X线摄影

本文以实例表明用柯达T颗粒感绿X线胶片配合专用的硫氧化钆/铽稀土元素绿增感屏进行矽肺肺摄影可以取得优越的临床诊断效果:细微结构清晰、信息量增加,有利于早期病变的检出。X线投照量仅需作对比用的常规富士感蓝X线胶片和钨屏组合的五分之一至三分之一。     

感绿医用X线胶片及增感屏

1　感绿医用Ｘ线胶片是医用Ｘ线胶片的一种新型产品医用Ｘ线胶片的生产和应用经历了若干重要的发展阶段 ,而其中最为重大的技术进步就是由常规感蓝医用Ｘ线胶片发展为新型的感绿医用Ｘ线胶片。感蓝医用Ｘ线胶片与常规钨酸钙增感屏组成屏 /片系统自二十世纪初开始在医疗卫生界得到广泛推广应用 ,成为医学影像诊断的重要手段 ,为医疗卫生事业的发展作出了重要贡献。随着优质聚酯片基取代三醋酸片基应用于医用Ｘ线胶片生产 ,以及高温快速自动冲洗加工技术的推广应用 ,更进一步促进了医用Ｘ线胶片的发展。近一个世纪以来 ,医用Ｘ线胶片已发展成…     

X射线增感屏

简述了Ｘ射线增感屏的作用、结构、种类、主要性能及维护保养等,重点突出了稀土增感屏在Ｘ射线摄影中的作用。     

不同类型感绿片的临床应用

我院将柯达感绿片应用于常规Ｘ线照片已近５年。富士通用型也已临床使用一年半之久。临床实践证明，在影像的对比度、锐利度、病变检出率、量子斑点及病人接触Ｘ线剂量上均优于普通感蓝片，而且影像质量也提高了。１．屏片组合的感度选择在感绿的屏片组合中，感光速度快，...     

利用CCD测定X射线增感屏的调制传递函数

本文论证了利用ＣＣＤ测定Ｘ射线胶片和增感屏调制传递函数和可行性，并给出了一种适用于ＣＣＤ测试数据的处理方法，对于同一种Ｘ射线胶片增感屏，分别给出了测微光密度计和ＣＣＤ两种测量数据及其误差分析，并用对几种不同增感屏和胶片性能做了评价，从实际应用中指出复ＣＣＤ探头测量调制传递函数的优越性。     

天津MGL型感绿医用X线胶片

1前言 医用 X线胶片作为医疗诊断用的重要信息记录材料,自 20世纪初至今,始终是医学影像诊断的重要手段,被医疗卫生界所广泛应用。 医用 X线胶片主要有与常规钨酸钙增感屏组合使用的感蓝医用 X线胶片和与发射绿光的稀土增感屏组合使用的感绿医用 X线胶片两大系列。 天津牌感蓝医用 X线胶片已有四十多年的生产历史。产品主要性能基本达到国外同类产品水平,成为国内深受用户欢迎的知名产品。面对国外感绿医用 X线胶片于 90年代初开始在我国推广并取得成功的形势,为了满足我国医疗卫生界对感绿医用 X线胶片的需求,天津远大感光材料…     

应用感蓝增感染料以降低X线胶片的银耗

研制Ｘ线胶片，降银是焦点，应用感蓝增感染料是有效手段．合成并试验了零甲川丹宁份菁染料，在保持现有产品照相性能条件下，涂银量可从６．５ｇ／ｍ２降低到５．５ｇ／ｍ２．     

对五种进口感绿胶片感光性能的测试

感绿胶片与硫氧化钆稀土增感屏（绿屏）配合使用，是近几年开发的新型屏－片组体合系。它与常规的蓝屏／蓝片体系比较，不仅提高了感光速度，降低了辐射剂量，而且还提高了影像的清晰度。基于此特点，绿屏／绿片的问世受到了医学影像学界的重视。目前，我国也在大力推广应...     

无损检测用增感屏的保护层研究

本文涉及无损检测用增感屏的保护层研究。通过在保护层中试验添加导电材料V205、促进剂M003,在不同湿度条件下测试涂层的表面电阻,筛选确定最佳添加量组合V205：M003=50：1;同时,通过在保护层中辅助添加阴离子型含氟表面活性剂FS-60（浓度1g/l）和有机硅类型润滑剂（浓度2g/l）,改善增感屏表观质量以降低保护层表面磨擦系数和高湿度条件下金属增感屏与胶片的黏连趋势,从而避免暗室操作过程中胶片与金属增感屏之间产生磨擦静电和黏连静电。     

Characterization of sol-gel derived scintillating LuBO3 films doped with rare earth ions

Rare earth doped LuBO₃ thin films have been prepared by combining sol-gel process and coating techniques such as spin coating and spray pyrolysis. Annealing treatment results in the crystallization of the film as vaterite phase and incorporation of the doping ions in solid solution. XPS and RBS spectroscopies showed that the composition of the films is close to the nominal one. Adventitious carbon has been observed and attributed to incomplete pyrolysis of metal-organic precursors. XPS concentration profiles show a good homogeneity for the films. RBS demonstrated some inter-diffusion between amorphous carbon substrate and borate films resulting in a gradient of carbon at the interface between the substrate and the film itself. Finally scintillation spectra have been recorded and demonstrate the potentiality of these films to be used as X-ray intensifying screens.     

硅铝二元膜包覆稀土发光材料的结构及耐水性能的研究

采用溶胶-凝胶法制备硅铝二元膜包覆稀土发光材料. 通过扫描电镜、X光电子能谱、比表面、多晶X射线衍射、荧光光谱和发光亮度的测试, 研究了材料的结构、包覆层与原始发光材料的相互作用及材料发光性能; 进一步通过pH值测定, 考察了材料的耐水性. 结果表明, 包覆层以无定型态与原始发光材料以化学作用结合, 而不是简单的物理包覆; 在原始发光材料表面包覆一层均匀的硅铝二元膜, 可有效提高材料的耐水性能, 而对材料的发光性能影响不大.     

Extraction Properties of Dibutylphosphoric Acid Zirconium Salt in Recovery of Transplutonium and Rare-Earth Elements from Nitric Acid Solution

The structures of dibutylphosphoric acid zirconium salt (Zr-DBP) and of the complexes formed in the organic phase in extraction of rare-earth elements with Zr-DBP were suggested on the basis of the extraction and IR data. The influence exerted by the acidity, Zr-DBP concentraiton, and degree of extractant saturation with the metal on the structure of the complexes was examined. The contributions of various extraction mechanisms for all the rare-earth elements and also for Am and Cm were revealed by mathematical simulation. Irrespective of the diluent, addition of TBP to Zr-DBP decreases the distribution factors of Ce, Eu, and Am but increases the extractant capacity for rare-earth elements by a value that considerably exceeds the extraction of the elements with TBP taken separately.     

Recombination properties of silicon passivated with rare-earth oxide films

The recombination properties of silicon passivated with films of rare-earth oxides were investigated. The films were obtained by thermal resistive sputtering of a rare-earth metal followed by thermal oxidation of the obtained layer in air at 400 °C. It was established that the effective nonequilibrium charge-carrier lifetime measured by photoconductivity relaxation is 2–3 times higher after deposition of the rare-earth oxide film. Surface recombination rates at the silicon-rare-earth oxide interface were determined to be 290–730 cm/s for different rare-earth oxides. The combination of high optical transmittance of the experimental materials and low recombination losses in silicon coated with a rare-earth oxide film makes it possible to recommend rare-earth oxide films as optical antireflection and passivating coatings for silicon photoelectric devices. Pis’ma Zh. Tekh. Fiz. 24, 16–21 (April 12, 1998)     

Doping Fe-based diamond tool matrix composites with a rare-earth element

The paper presents the experiments on adding rare-earth element cerium to diamond matrix composites. Based on the doping of rare earth in metal powders including tungsten carbide, a small amount of nickel, iron entirely replacing cobalt in diamond matrix and the process route of rare earth doping is indicated. The performance of matrix composites with and without rare-earth elements has been assessed. The results obtained show that the flexural strength, the hardness, and the impact ductility of matrix composites with rare-earth elements have been improved. The flexural strength and the impact ductility increased correspondently by 10–62% and about 5, as compared to composites free of rare-earth elements. Rare-earth diamond tool matrix composites where Co was r’eplaced with Fe, which provides a good practical service performance and a low price, have been successfully studied, corresponding diamond bits and saw blades have been manufactured.     

Intensification of heat transfer and stabilization of the boiling process in the very low pressure region

Various processes of intensifying heat transfer and stabilizing the boiling process for liquids in the very low pressure region are analyzed and studied experimentally. The great effectiveness of using thin hydrophobic screens attached to the surface to be heated was discovered.Translated from Izhenerno-Fizicheskii. Zhurnal, Vol. 20, No. 6, pp. 973–981, June, 1971.