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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">izmertech</journal-id><journal-title-group><journal-title xml:lang="ru">Измерительная техника</journal-title><trans-title-group xml:lang="en"><trans-title>Izmeritel`naya Tekhnika</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-1025</issn><issn pub-type="epub">2949-5237</issn><publisher><publisher-name>ФГУП "ВНИИФТРИ"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32446/0368-1025it.2021-4-3-8</article-id><article-id custom-type="elpub" pub-id-type="custom">izmertech-1894</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФУНДАМЕНТАЛЬНЫЕ ПРОБЛЕМЫ МЕТРОЛОГИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>FUNDAMENTAL PROBLEMS OF METROLOGY</subject></subj-group></article-categories><title-group><article-title>Исследование спектров ядерного магнитного резонанса ионов калия в водных растворах и оценка магнитного момента ядра 39K</article-title><trans-title-group xml:lang="en"><trans-title>Investigation of the nuclear magnetic resonance spectra of potassium ions in aqueous solutions and estimation of the magnetic moment of the nucleus 39K</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Неронов</surname><given-names>Ю. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Neronov</surname><given-names>Y. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юрий Ильич Неронов</p><p> Санкт-Петербург</p></bio><bio xml:lang="en"><p>Yuryi I. Neronov</p><p>St. Petersburg</p></bio><email xlink:type="simple">yineronov@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пронин</surname><given-names>А. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Pronin</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Антон Николаевич Пронин</p><p> Санкт-Петербург</p></bio><bio xml:lang="en"><p>Anton N. Pronin</p><p>St. Petersburg</p></bio><email xlink:type="simple">a.n.pronin@vniim.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Всероссийский научно-исследовательский институт метрологии им. Д. И. Менделеева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>D. I. Mendeleev All-Russian Research Institute of Metrology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>01</day><month>08</month><year>2023</year></pub-date><volume>0</volume><issue>4</issue><fpage>3</fpage><lpage>8</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; ФГУП "ВНИИФТРИ", 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">ФГУП "ВНИИФТРИ"</copyright-holder><copyright-holder xml:lang="en">ФГУП "ВНИИФТРИ"</copyright-holder><license xlink:href="https://www.izmt.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.izmt.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.izmt.ru/jour/article/view/1894">https://www.izmt.ru/jour/article/view/1894</self-uri><abstract><p>Рассмотрена проблема повышения точности определения магнитного момента ядра калия 39K, применяемого при исследованиях нормы и патологии живых тканей методами ядерного магнитного резонанса. Представлены экспериментальные результаты определения отношения частот резонансов протонов воды и ядер 39K для водных растворов KCl и KNO3 концентрациями 0,5–2,0 моль/кг. В результате одновременной регистрации сигналов ядерного магнитного резонанса протонов воды и ядер 39K минимизированы случайные и систематические погрешности определения отношения частот резонанса воды и 39K+ до единиц восьмого знака. При экстраполяции содержания солей калия в воде к нулевым концентрациям для одиночных ионов в воде значение указанного выше отношения частот резонанса составило 21,4300226(10). Итоговый магнитный момент ядра 39K получен с учётом данных для магнитного момента протона и экранирования протонов в воде, представлен без корректировки на экранирование иона калия в воде в единицах ядерного магнетона и составил 0,390962111(18). С использованием значения экранирования ионов калия в воде найден магнитный момент ядра калия 0,391471(8), который сопоставлен с данными, полученными другими исследователями.</p></abstract><trans-abstract xml:lang="en"><p>The problem of increasing the accuracy of determining the magnetic moment of the potassium 39K nucleus, which is used in studies of the norm and pathology of living tissues by nuclear magnetic resonance methods, is considered. The paper presents experimental results for determining the resonance frequency ratio of water protons and 39K nuclei for KCl and KNO3 solutions at concentrations from 0.5 to 2 mol/kg of water. NMR signals from water protons and potassium nuclei were recorded simultaneously, which minimizes random and systematic errors in determining the ratio of the resonance frequencies to units of the eighth sign. When extrapolating the content of potassium salts in water to zero concentrations for single ions in water, it was determined 21.4300226(10). Using the known data for the magnetic moment of the proton and the data for proton shielding in water, we obtained 0.390962111(18). Shielding of potassium ions in water was previously calculated in the work of Antisera and others. When using these data on the shielding of potassium ions in water, the magnetic moment of the potassium core was obtained 0.391471(8). The comparison of the new result for μ( 39K) with the data of previous works is discussed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>ядерные магнитные моменты</kwd><kwd>ядро атома калия</kwd><kwd>одновременная регистрация ЯМР-сигналов</kwd><kwd>квантовая радиофизика</kwd></kwd-group><kwd-group xml:lang="en"><kwd>nuclear magnetic moments</kwd><kwd>potassium atom nucleus</kwd><kwd>simultaneous registration of NMR-signals</kwd><kwd>quantum radiophysics</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Mohr P. J., Newell D. B., and Taylor B. N., CODATA Recommended Values of the Fundamental Physical Constants: 2014, Reviews of Modern Physics, 2016, 88, Article ID: 035009. https://doi.org/10.1103/RevModPhys.88.035009</mixed-citation><mixed-citation xml:lang="en">Mohr P. J., Newell D. B., and Taylor B. 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