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0402U003686,
к.т.н.
20-11-2002
o
Surface processes leading to spectrometric characteristics' degradation of NaI(Tl) and CsI(Na) scintillators
Gres Valeriya Yurievna,
popup.head Kudin A.M.
popup.opponent Дубовик М.Ф.
popup.opponent Мацокін В.П.
Об'єкт дослідження: сцинтиляційни кристали NaI(Tl) і CsI(Na). Мета дослідження: дослідити деградацію спектрометричних характеристик детекторів NaI(Tl) і CsI(Na) у взаємозв'язку з фізико-хімічними процесами поблизу їх поверхні. Методи дослідження: оптична та електронна мікроскопія, рентгенофазовий та рентгеноструктурний аналізі, рентгенівська фотоелектронна спектроскопія, люмінесцентні та сцинтиляційні вимірювання. Теоретичні і практичні результати, новизна: на підставі зміни спектрального складу люмінесценції у процесі негерметичного збереження кристалів NaI(Tl) розроблено методику контролю працездатності детектора в процесі експлуатації. Запропоновано спосіб виготовлення детектора з ефективним дифузійним відбивачем. Для кристалів CsI і CsI(Na) виявлене збільшення сцинтиляційної ефективності поблизу поверхні відразу після полірування. Виявлено скорочення тривалості сцинтиляцій для квантів низьких енергій збуджуючого випромінювання. Запропоновано підхід до розв'язання проблеми обмеження власного енергетичного розділення. Ступінь впровадження: методика контролю працездатності детектора в процесі експлуатації, що використається у дослідному виробництві НДВ ЛГК НТК "Інститут монокристалів". Галузь використання: сцинтиляційна техніка, радіаційне матеріалознавство, фізика поверхні кристалів.
2002-11-20
2020-04-04
Updated: 2025-12-07
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