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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Radiation biology. Radioecology</journal-id><journal-title-group><journal-title xml:lang="en">Radiation biology. Radioecology</journal-title><trans-title-group xml:lang="ru"><trans-title>Радиационная биология. Радиоэкология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-8031</issn><issn publication-format="electronic">3034-5898</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">661130</article-id><article-id pub-id-type="doi">10.31857/S086980312302011X</article-id><article-id pub-id-type="edn">EPDGBB</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Studying the Consequences of Radiation Accidents</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Изучение последствий радиационных аварий</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Dependence of the Translocation Frequency in Blood Lymphocytes on the Dose and Age at the Onset of Exposure in Residents of the Techa Riverside Settlements</article-title><trans-title-group xml:lang="ru"><trans-title>Зависимость частоты транслокаций в лимфоцитах КРОВИ от дозы и возраста на начало облучения у жителей прибрежных сел реки Теча</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tolstykh</surname><given-names>E. I.</given-names></name><name xml:lang="ru"><surname>Толстых</surname><given-names>Е. И.</given-names></name></name-alternatives><email>evgenia.tolstykh@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vozilova</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Возилова</surname><given-names>А. В.</given-names></name></name-alternatives><email>evgenia.tolstykh@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Degteva</surname><given-names>M. O.</given-names></name><name xml:lang="ru"><surname>Дегтева</surname><given-names>М. О.</given-names></name></name-alternatives><email>evgenia.tolstykh@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Akleev</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Аклеев</surname><given-names>А. В.</given-names></name></name-alternatives><email>evgenia.tolstykh@yandex.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ural Scientific and Practical Center of Radiation Medicine of the Federal Medical and Biological Agency 
of the Russian Federation</institution></aff><aff><institution xml:lang="ru">Уральский научно-практический центр радиационной медицины 
Федерального медико-биологического агентства Российской Федерации</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Chelyabinsk State University</institution></aff><aff><institution xml:lang="ru">Челябинский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-03-01" publication-format="electronic"><day>01</day><month>03</month><year>2023</year></pub-date><volume>63</volume><issue>2</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>115</fpage><lpage>127</lpage><history><date date-type="received" iso-8601-date="2025-02-25"><day>25</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Е.И. Толстых, А.В. Возилова, М.О. Дегтева, А.В. Аклеев</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Е.И. Толстых, А.В. Возилова, М.О. Дегтева, А.В. Аклеев</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Е.И. Толстых, А.В. Возилова, М.О. Дегтева, А.В. Аклеев</copyright-holder><copyright-holder xml:lang="ru">Е.И. Толстых, А.В. Возилова, М.О. Дегтева, А.В. Аклеев</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-8031/article/view/661130">https://journals.eco-vector.com/0869-8031/article/view/661130</self-uri><abstract xml:lang="en"><p id="idm45181324454704">Evaluation of age effect on the frequency of radiation-induced translocations, registered using FISH in circulating T-lymphocytes in the long-term period after exposure, is both of theoretical and practical interest for the purposes of biodosimetry. The objective of our study was to analyze the dose dependence of the translocation frequency in the peripheral blood T-lymphocytes in donors of different age who were exposed in the Techa Riverside settlements (<italic>n</italic> = 197). In cytogenetic studies, whole chromosome painting probes were used to stain three pairs of chromosomes. A total of 104,721 genome equivalents (GE) were calculated and 2,540 translocations were found. For each donor, the individual absorbed doses in organs and tissues at the time of blood sampling were calculated using the Techa River Dosimetry System. In addition, doses to T-lymphocytes and their progenitors were calculated using the innovative modelling approach with due account of age related-dynamics of T-lymphocytes. The age dependence of the translocation frequency was associated particularly with these doses. The main sources of donor exposure were <sup>89,90</sup>Sr, accumulating in bones and irradiating the bone marrow almost locally. To assess the parameters of the dose-effect relationship, linear regression model was used. After taking into account background values, the lowest frequency of translocations per 1000 GE per Gy was found in donors aged 0–5 years at the time of exposure (9.3 ± 1.3), which is statistically significantly lower than in children aged 6–18 years (15.3 ± 1.5), but not in adults (11.9 ± 2.9). The value for adults (&gt;18 years) was characterized by the maximum scatter, but was close to the values obtained in an international study of nuclear enterprise personnel after external exposure (11.6 ± 1.6). The values of the background translocation frequencies registered in various age groups correspond to the published data obtained in a joint international study on unexposed donors. We have also confirmed the absence of sex-effect on the frequency of translocations.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324450192">Оценка влияния возраста на частоту радиационно-индуцируемых транслокаций, регистрируемых методом FISH в циркулирующих в Т-лимфоцитах в отдаленный период после облучения, имеет как теоретический, так и практический интерес для целей биодозиметрии. Целью нашей работы был анализ дозовой зависимости частоты транслокаций в Т-лимфоцитах периферической крови у доноров различного возраста, подвергшихся облучению в прибрежных селах р. Теча (<italic>n</italic> = 197). В цитогенетических исследованиях использовали цельно-хромосомные зонды для окрашивания трех пар хромосом. Всего было просчитано 104 721 геном-эквивалентов (GE) и обнаружено 2540 транслокаций. Для каждого донора индивидуальные дозы облучения, поглощенные в органах и тканях к моменту забора крови, были рассчитаны с использованием дозиметрической системы р. Теча. Кроме того, были рассчитаны дозы на Т-лимфоциты и их предшественников с использованием оригинального модельного подхода с учетом возрастной динамики Т-лимфоцитов; именно с этими дозами были связаны возрастные зависимости частоты транслокаций. Основными источниками облучения доноров были <sup>89,90</sup>Sr, накапливающиеся в кости и практически локально облучающие костный мозг. Для оценки параметров зависимости доза–эффект использовали линейную регрессионную модель. После учета фоновых значений наименьшая частота транслокаций на 1000 GE на Гр была выявлена у доноров в возрасте 0–5 лет на момент облучения (9.3 ± 1.3), что статистически значимо ниже, чем у детей 6–18 лет (15.3 ± 1.5), но не у взрослых (11.9 ± 2.9). Значение для взрослых (&gt;18 лет) характеризовалось максимальным разбросом, но оказалось близким к величинам, полученным в международном исследовании профессионалов после внешнего облучения (11.6 ± 1.6). Значения фоновых частот транслокаций, определенных в различных возрастных группах, соответствуют опубликованным значениям, полученным в объединенном международном исследовании по необлученным донорам. Мы также подтвердили отсутствие влияние пола на частоту транслокаций.</p></trans-abstract><kwd-group xml:lang="en"><kwd>circulating T-lymphocytes</kwd><kwd>chromosomal aberrations</kwd><kwd>translocations</kwd><kwd>human age</kwd><kwd>biodosimetry</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>циркулирующие Т-лимфоциты</kwd><kwd>хромосомные аберрации</kwd><kwd>транслокации</kwd><kwd>возраст человека</kwd><kwd>биодозиметрия</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы выражают благодарность В.А. Кривощапову и С.Б. Епифановой за техническую помощь в работе.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Tucker J.D. 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