ИСПОЛЬЗОВАНИЕ ИНТЕНСИВНОСТИ РАССЕЯННОГО ВЕЩЕСТВОМ РЕНТГЕНОВСКОГО ИЗЛУЧЕНИЯ В ПРАКТИКЕ РЕНТГЕНОФЛУОРЕСЦЕНТНОГО АНАЛИЗА

A. L. Tsvetyanskii, A. N. Eritenko

Аннотация


Выполнен критический обзор опубликованных работ, посвященных теории и практике применения рассеянного первичного рентгеновского излучения веществом. Детально рассмотрены физические основы упругого и неупругого рассеяния рентгеновских фотонов атомами вещества. 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 атомными номерами. Проведен анализ влияния аномального рассеяния на результаты рентгенофлуоресцентного анализа (РФА) и возможности его учета. Приведены примеры успешных попыток учета или компенсации изменения коэффициентов рассеяния образцов. Рассмотрены различные случаи использования рассеянного излучения в практике РФА с целью учета матричных эффектов и других трудноконтролируемых факторов. Продемонстрированы примеры эффективного и ограниченного использования рассеянного излучения в регрессионных уравнениях связи и способе теоретических поправок, а также нестандартного применения рассеянного излучения. Сделаны выводы и даны практические рекомендации. 

Ключевые слова: рентгенофлуоресцентный анализ, рассеянное излучение, дифференциальные сечения когерентного и некогерентного рассеяния, аномальное рассеяние, межэлементные влияния.

DOI: http://dx.doi.org/10.15826/analitika.2014.18.1.001

 


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Литература


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