Untitled

Smagunova, A. N.; Ondar, U. V.; Nikitina, V. G.; Козлов, В. А.

doi:10.1023/a:1016760413125

Cited by 4 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The values C min and C lim can be calculated by the probability method or by using the empirical dependence of the error in quantification of a component on its content in a sample. [7,8] In the latter case, in order to construct a graph, samples with successive change of composition in the 'analyte filler' binary system are required. It is difficult to prepare such specimens in EPMA and, in fact, only probability method is applicable here.…”

Section: Theoretical Partmentioning

confidence: 99%

See 1 more Smart Citation

Electron probe determination of trace elements in olivine

Korolyuk

Pokhilenko

2014

X-Ray Spectrometry

View full text Add to dashboard Cite

Evaluation of the error of computations using analysis results requires knowing the error of determining the analyte. The necessity of limiting the error of computations conditions the value of the permissible error of determining the concentration: it should not exceed a certain predetermined limit. In particular, such a requirement is made for determining a component by the content of which the temperature of rock formation is calculated in a mineral. This study demonstrates derivation of a formula for quantitation limit C lim of an analyte. Relations have been obtained connecting C lim , the detection limit C min , and the relative standard deviation V of the element quantitation. The equations connecting metrological characteristics allowed identifying the required analysis conditions and their practicability. The characteristics of the methodology for quantitation of Na 2 O, Al 2 O 3 , CaO, Cr 2 O 3 и MnO in the olivines of depleted peridotites have been identified using microanalyzer JXA-8100, with the accelerating voltage of 20 kV and the probe current of 400 nA. The count rate per measurement was 10 s in the line and background positions. The number of measurements per quantitation was 25. Under these conditions, C min of the aforementioned oxides does not exceed 9 ppmw for 1σ-criterion. For V = 0.1, C lim is within the range of 45-100 ppmw. The example of an 'aluminum' geothermometer serves to demonstrate that electron probe micro analysis may ensure the error required for calculating the temperature by the content of trace elements.

show abstract

Section: Theoretical Partmentioning

confidence: 99%

“…The contribution to the random error may be neglected if its value does not exceed 1/3 of the total error (1/9 of the total variance). [8] Let us apply this rule to the error caused by measurements in the standard. For the background component of the variance to be negligibly small, the condition…”

Section: Theoretical Partmentioning

confidence: 99%

Electron probe determination of trace elements in olivine

Korolyuk

Pokhilenko

2014

X-Ray Spectrometry

View full text Add to dashboard Cite

show abstract

“…Авторы [90], правильно отмечая слабую зави-симость отношения ϰ A от условий проведения экс-перимента, также указывают на возможность ком-пенсации эффекта крупности частиц излучателя. Исследования, проведенные в работах [91][92][93][94][95], по-казали, что зависимости интенсивностей флуорес-ценции и рассеяния от крупности частиц различ-ны, и компенсация этого эффекта возможна лишь в частных случаях. Возможно, решение этой чрез-вычайно сложной задачи нужно связывать с опре-делением коэффициентов ослабления пробы на длине волны первичного и флуоресцентного из-лучений по аналогии с [96].…”

Section: применение рассеянного рентгеновского излучения в практике рфаunclassified

Use of intensity of the X-ray radiation disseminated by substance in practice of X-ray fluorescent analysis

Tsvetyanskii¹,

Eritenko²

2014

АиК

View full text Add to dashboard Cite

ФГАОУ ВПО «Южный федеральный университет»Российская Федерация, 344006, Ростов-на-Дону, ул. Большая Садовая, 105 jecker@inbox.ruПоступила в редакцию 14 ноября 2013 года, после исправлений -4 марта 2014 года.Выполнен критический обзор опубликованных работ, посвященных теории и практике при-менения рассеянного первичного рентгеновского излучения веществом. Детально рассмотре-ны физические основы упругого и неупругого рассеяния рентгеновских фотонов атомами ве-щества. Сопоставлены результаты расчетов дифференциальных коэффициентов рассеяния с экспериментальными данными различных авторов. Показана необходимость учета вклада многократного рассеяния в интенсивность рассеянного излучения на образцах с малыми атом-ными номерами. Проведен анализ влияния аномального рассеяния на результаты рентгеноф-луоресцентного анализа (РФА) и возможности его учета. Приведены примеры успешных по-пыток учета или компенсации изменения коэффициентов рассеяния образцов. Рассмотрены различные случаи использования рассеянного излучения в практике РФА с целью учета ма-тричных эффектов и других трудноконтролируемых факторов. Продемонстрированы примеры эффективного и ограниченного использования рассеянного излучения в регрессионных урав-нениях связи и способе теоретических поправок, а также нестандартного применения рассе-янного излучения. Сделаны выводы и даны практические рекомендации.Ключевые слова: рентгенофлуоресцентный анализ, рассеянное излучение, дифферен-циальные сечения когерентного и некогерентного рассеяния, аномальное рассеяние, межэ-лементные влияния.Цветянский Александр Леонидович -доктор физико-математических наук, про-фессор кафедры общей физики Южного федерального университета.Область научных интересов: рентгенофлуоресцентный анализ, методики анализа и программное обеспечение.Опубликовано более 100 научных работ.Еритенко Александр Николаевич -кандидат физико-математических наук, стар-ший научный сотрудник НИИ физики Южного федерального университета.Область научных интересов: рентгенофлуоресцентный анализ, теория возбужде-ния рентгеновского излучения заряженными частицами, программное обеспечение.Опубликовано более 100 научных работ. ВведениеАналитическим сигналом в рентгенофлуо-ресцентном анализе (РФА) служат интенсивно-сти наиболее ярких линий характеристического спектра элементов. Характеристический спектр возникает на фоне, создаваемом рассеянным средой излучением. Во многих случаях наличие этого фона приводит к снижению чувствитель-ности метода и повышению порога обнаружения элементов. С другой стороны, рассеянное из-лучение является функцией вещественного со-става среды и других физико-химических харак-теристик. Поэтому измерение и использование интенсивности рассеянного излучения в целом ряде случаев позволяет снизить влияние ряда трудноконтролируемых факторов при проведе-нии рентгенофлуоресцентного анализа и повы-сить точность определений. Краткая теория рассеянияПри взаимодействии рентгеновского излу-чения с веществом в основном происходят два процесса, приводящие к ослаблению первичного пучка: фотоэлектрический эффек...

show abstract

“…The world's first works on the study of the spectral composition of the background in X-ray fluorescence spectra were performed by Blokhin and Druz' from the Rostov school of X-ray spectrochemical analysis [36]. These studies were later continued by Losev, Smagunova, and Pavlinskii in the short-wavelength spectral region, and by Afonin, Revenko, Gunicheva, and Pavlinskii in the long-wavelength spectral region [19,20,[37][38][39][40][41][42][43]. They derived semiempirical expressions for different background components and quantitatively assessed the changes in their contributions to the background intensity as functions of the conditions of spectrum excitation, the chemical composition of the sample, and the particle size.…”

mentioning

confidence: 99%

“…The results of these studies allowed us to formulate recommendations for selecting the optimum conditions for an analysis using the reference background method [37,40,[50][51][52], studying sources of error in the internal standard method, and making recommendations for their inclusion or elimination [8,13,53,54]. The researchers of the Irkutsk school devoted a great deal of attention to studying the constraint equation as the most advanced method for the inclusion of interelement interactions.…”

mentioning

confidence: 99%

The Irkutsk school of X-ray spectrochemical analysis

Smagunova

Pavlinskii

2005

J Anal Chem

Self Cite

View full text Add to dashboard Cite

1 In early 1930s, at East Siberian University in the city of Irkutsk (now Irkutsk State University), an X-ray laboratory was founded at which both professors and students were actively engaged in X-ray phase analysis and students were trained in X-ray physics. During the same period, instruments for X-ray structural analysis of minerals were installed at the Irkutsk Research Institute of Rare and Nonferrous Metals (Irgiredmet); the organization of a school of X-ray spectrochemical analysis in Irkutsk was therefore expected. It was organized and headed by Nikolai Fomich Losev, a graduate of the Department of Physics at Rostov State University (RSU).Losev was born into a family of rural teachers on December 6, 1927, in the town of Bazki, in the Veshensk district of Rostov-on-Don oblast. After graduating from Rostov State University in 1951, Losev, a student of Professor M.A. Blokhin, began his work at the Irgiredmet Physical Laboratory. He worked there for 13 years. For Losev, these were years of social and professional growth. He was an Irgiredmet Komsomol leader and Communist Party secretary. In 1960, Losev became a candidate of sciences in physics and mathematics. It was then, in the early 1960s, that a school of X-ray spectrochemical analysis grew up around Losev. The staff of the school was composed of graduates from the Department of Physics of Irkutsk State University, where Professor Losev had delivered a corresponding lecture course. Losev's first disciples (in chronological order) were A.N. Smagunova, G.V. Pavlinskii, V.P. Afonin, and T.N. Gunicheva; they all later became doctors of sciences.In 1967 Losev was appointed Dean of Irkutsk State University. Losev's years as dean saw his professional and organizational talents blossom. In 1968, he defended his doctoral dissertation in physics and mathematics at Rostov State University, and became the youngest doctor of sciences at Irkutsk University. Headed by Professor Losev, Irkutsk State University evolved much more rapidly than most other Russian universities. It is still commonly believed that Losev (3) at the Institute of Geochemistry of the Siberian Division of the Academy of Sciences of the USSR;(4) At the Irgiredmet Physical Laboratory.Research was done along the following lines:(1) Developing the theoretical foundations of X-ray spectrochemical analysis (studying the processes that give rise to primary and secondary X-ray spectra);(2) Developing the methodological foundations for studying the sources of errors in the results of X-ray fluorescence analysis and electron probe X-ray microanalysis (EPMA), and seeking methods for their inclusion or elimination;(3) Introducing the results of the research into practice;(4) The methodology of analytical control. The results of these investigations made a significant contribution to the development of X-ray spectrochemical analysis.At the time the school was established, the theory of the excitation of X-ray fluorescence spectra was based on a monochromatic model, even though under real conditions spectra are ...

show abstract

Untitled

Cited by 4 publications

References 0 publications

Electron probe determination of trace elements in olivine

Electron probe determination of trace elements in olivine

Use of intensity of the X-ray radiation disseminated by substance in practice of X-ray fluorescent analysis

The Irkutsk school of X-ray spectrochemical analysis

Contact Info

Product

Resources

About