izmertechИзмерительная техникаIzmeritel`naya Tekhnika0368-10252949-5237ФГУП "ВНИИФТРИ"10.32446/0368-1025it.2025-5-98-104izmertech-2374Research ArticleФИЗИКО-ХИМИЧЕСКИЕ ИЗМЕРЕНИЯPHYSICOCHEMICAL MEASUREMENTSОпределение мёртвого времени детектора при исследовании состава изотопно-обогащённых растворов меди 65Cu и цинка 68ZnDetermination of dead time in the study of isotopic composition of copper and zinc solutions enriched 65тCu and 68Znhttps://orcid.org/0000-0003-4336-4800ВострокнутоваЕ. В.VostroknutovaE.

Елена Владимировна Вострокнутова

620075, Свердловская область, г. Екатеринбург, ул. Красноармейская, 4

Elena V. Vostroknutova

Yekaterinburg

VostroknutovaEV@uniim.ruУральский научно-исследовательский институт метрологии – филиал Федерального государственного унитарного предприятия «Всероссийский научно-исследовательский институт метрологии им. Д. И. Менделеева»РоссияUral Scientific Research Institute for Metrology – Affiliated branch of the D. I. Mendeleyev Institute for MetrologyRussian Federation20251411202574598104Copyright © ФГУП "ВНИИФТРИ", 20252025ФГУП "ВНИИФТРИ"ФГУП "ВНИИФТРИ"https://www.izmt.ru/jour/about/submissions#copyrightNoticehttps://www.izmt.ru/jour/article/view/2374

При измерении изотопного состава веществ и материалов с помощью квадрупольного масс-спектрометра с индуктивно связанной плазмой основным источником искажений измеренных изотопных отношений является мёртвое время детектора. В связи с этим важными этапами процесса разработки стандартных образцов изотопного состава являются определение значений мёртвого времени детектора и соответствующая коррекция полученных результатов. Рассмотрены три метода определения мёртвого времени, основанные на измерениях изотопных отношений 63Cu/65Cu, 64Zn/68Zn, 66Zn/68Zn, 67Zn/68Zn, 70Zn/68Zn в растворах меди и цинка с различными массовыми долями, а также метод сравнения импульсного и аналогового сигналов детектора квадрупольного масс-спектрометра с индуктивно связанной плазмой. Четырьмя методами исследовано влияние мёртвого времени детектора на результаты измерений изотопных отношений при определении изотопного состава растворов меди и цинка, обогащённых изотопами 65Cu и 68Zn соответственно. Рассчитаны неопределённости полученных значений мёртвого времени детектора указанными методами. В результате исследований выбраны наиболее точные методы определения мёртвого времени детектора – метод анализа угловых коэффициентов и метод подбора (методы 3, 4). При исследовании изотопно-обогащённого раствора 65Cu мёртвое время детектора, полученное методом 3, составило (73±4) нс, а методом 4 – (76±4) нс. В случае изотопно-обогащённого раствора 68Zn наиболее точным оказался метод 4, мёртвое время детектора составило (42±4) нс. Полученные результаты использованы при разработке и характеризации стандартных образцов изотопного состава растворов меди и цинка, обогащённых изотопами 65Cu и 68Zn

In measuring the isotopic composition of substances and materials using an inductively coupled plasma quadrupole mass spectrometer, the main source of bias in the measured isotopic ratios is the detector dead time. In this regard, an important step in the development of reference materials for isotopic composition is the determination and correction of the results for dead time. This work is devoted to the determination and study of the effect of dead time on the results of isotopic ratios in the study of the isotopic composition of copper and zinc solutions enriched in 65Cu and 68Zn isotopes. The study considers several methods for determining the dead time based on measurements of the isotopic ratios of 63Cu/65Cu, 64Zn/68Zn, 66Zn/68Zn, 67Zn/68Zn, 70Zn/68Zn in solutions with different mass fractions of copper and zinc, as well as a method based on comparing the pulse and analog detector signal on an inductively coupled plasma quadrupole mass spectrometer. The uncertainties of dead time measurements by different methods are calculated. In the course of the work, optimal methods for determining the dead time are found and selected for further research. The detector dead time is (76±4) ns for enriched 65Cu solution and (42±4) ns for enriched 68Zn solution.

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The authors declare that there are no conflicts of interest present.