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Использование защитных полимерных пленок при рентгенофлуоресцентном анализе


DOI: 10.26896/1028-6861-2017-83-11-29-34

Н. Я. Варкентин, О. А. Караваева; № 11 (83), 11.2017

Аннотация:

Рассмотрено применение защитных полимерных пленок в практике рентгенофлуоресцентного анализа. Обобщены данные нормативных документов в части требований к рентгеновским пленкам. Проведены обзор и сравнение физико-химических свойств пленок, реализуемых на территории России. На примере Kα-линий элементов Al, Si и Ti показано влияние типа применяемого полимера на поглощение интенсивности вторичной флуоресценции. Исследована зависимость интенсивности флуоресценции от атомного номера излучающего элемента для различных типов полимеров. Отмечена возможность использования хлор- и серосодержащих пленок в качестве фильтров вторичной флуоресценции. Приведены требования нормативных документов и фактические данные по разнотолщинности на примере полипропиленовой пленки. Рассчитаны снижения и колебания интенсивностей флуоресценции аналитических линий легких элементов в зависимости от неравномерности физико-химических свойств применяемых пленок. Приведена оценка влияния примесных элементов в материале полимера на интенсивность их аналитических линий. Проведен анализ эксплуатационных свойств пленок, на основе которого различные типы полимеров рекомендованы для определенных аналитических задач.

Ключевые слова: рентгеновская защитная пленка; ослабление интенсивности; полипропилен; полиэтилентерефталат; майлар; разнотолщинность.

Protective Polymer Films in X-Ray Fluorescence Analysis

N. Ya. Varkentin and O. A. Karavaeva

Some aspects of using protective polymer films in practice of x-ray fluorescence are considered. Data of practice guidelines regulating the measurement procedure in part of the requirements for x-ray films, are summarized. Data of practice guidelines regulating the measurement procedure in part of the requirements regarding x-ray films, are summarized. A review and comparison of the physical and chemical properties of films presented on the Russian market are analyzed. The influence of the polymer type on the absorption of secondary fluorescence intensity is shown for the Kα lines of Al, Si, and Ti. The analysis of the dependence of fluorescence intensity on the atomic number of the radiating element is considered for different polymer types. Chlorine- and sulfur-containing films can be used as filters of secondary fluorescence. Regulatory requirements for different thicknesses of films and actually different thicknesses are specified for a polypropylene film. Decreases and fluctuations of the fluorescence intensity of the analytical lines of light elements are calculated as a function of the unevenness of physical and chemical properties of the films thus used. The influence of impurities present in the polymer material on the intensity of the analytical lines of these elements is estimated. Important from a practical point of view performance characteristics of the films are analyzed. Recommendations regarding the types of polymers are specified depending on the analytical tasks being solved.

Keywords: x-ray protective film; decrease in intensity; polypropylene; polyethylene terephthalate; Mylar; thickness difference.

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