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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.2021-7-54-59</article-id><article-id custom-type="elpub" pub-id-type="custom">izmertech-1926</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>ИЗМЕРЕНИЯ ИОНИЗИРУЮЩИХ ИЗЛУЧЕНИЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>IONIZING RADIATION MEASUREMENTS</subject></subj-group></article-categories><title-group><article-title>Расчёт спектров фотонейтронных источников</article-title><trans-title-group xml:lang="en"><trans-title>Photoneutron sources spectra calculation</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>Моисеев</surname><given-names>Н. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Moiseev</surname><given-names>N. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Николай Николаевич Моисеев</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Nikolaj N. Moiseev</p><p>St. Petersburg</p></bio><email xlink:type="simple">n.n.moiseev@vniim.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>Круглов</surname><given-names>Е. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Kruglov</surname><given-names>E. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Евгений Михайлович Круглов</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Evgenij M. Kruglov </p><p>St. Petersburg</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дидык</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Didyk</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Андрей Вячеславович Дидык</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Andrej V. Didyk</p><p>St. Petersburg</p></bio><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 имени Д. И. Менделеева</institution><country>Россия</country></aff><aff xml:lang="en"><institution>D. I. Mendeleyev Institute for 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>08</day><month>08</month><year>2023</year></pub-date><volume>0</volume><issue>7</issue><fpage>54</fpage><lpage>59</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/1926">https://www.izmt.ru/jour/article/view/1926</self-uri><abstract><p>Рассмотрены вопросы повышения точности определения средней энергии и вида энергетического распределения (формы спектра) нейтронов Sb-Be- и Ra-Be-источников. Указанные фотонейтронные источники применяются для калибровки энергетических шкал нейтронных спектрометров и определения энергетической зависимости чувствительности радиометров и дозиметров нейтронов. Предложена методика расчёта энергетических спектров радионуклидных источников нейтронов типа Sb-Be (γ, n) и Ra-Be (γ, n) и приведены результаты расчёта. Исследована зависимость спектра источника от его конструкции. Правильность результатов расчёта энергетических спектров радионуклидных источников подтверждена экспериментально. Полученные данные будут востребованы для определения энергетической зависимости чувствительности нейтронных спектрометров, радиометров и дозиметров. </p></abstract><trans-abstract xml:lang="en"><p>The issues of increasing the accuracy of determining the average energy and the type of energy distribution (shape of the spectrum) of neutrons from Sb-Be- and Ra-Be-sources are considered. The indicated photoneutron sources are used to calibrate the energy scales of neutron spectrometers and to determine the energy dependence of the sensitivity of radiometers and neutron dosimeters. A method is proposed for calculating the energy spectra of radionuclide neutron sources of the Sb-Be (γ, n) and Ra-Be (γ, n) types, and the calculation results are presented. The dependence of the spectrum of the source on its design is investigated. The correctness of the results of calculating the energy spectra of radionuclide sources has been confi rmed experimentally. The data obtained will be used to determine the energy dependence of the sensitivity of neutron spectrometers, radiometers and dosimeters.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>спектр</kwd><kwd>фотонейтронный источник</kwd><kwd>(γ</kwd><kwd>n)-реакция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>spectrum</kwd><kwd>photoneutron source</kwd><kwd>(γ</kwd><kwd>n)-reaction</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">Руднев П., Моисеев Н., Дидык А. Спектрометр-дозиметр SDMF-1206PRO.DB – эффективный инструмент для исследования нейтронного и γ-излучения // Электроника: Наука, технология, бизнес. 2016. № 8 (158). 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