ЭПР-исследование кинетики распада свободных радикалов облученной сахарозы

Аннотация

Спектрометрия на основе электронного парамагнитного резонанса (ЭПР) позволяет исследовать образование свободных радикалов в процессе передачи энергии объекту исследования. Кинетика распада свободных радикалов --- неотъемлемая часть исследования, так как указанное явление напрямую препятствует целям точной идентификации факта облучения и дальнейшей дозиметрии с помощью ЭПР-спектрометрии. В настоящей работе исследована временная зависимость интенсивности и характеристик ЭПР-сигнала аналитической сахарозы, облученной гамма-квантами в дозах 0,3...9 кГр. Показано, что облученная сахароза дает стабильный ЭПР-пик даже спустя 60 сут. Зарегистрировано изменение спектральных характеристик сигнала в первые 23 ч после облучения. Интенсивность сигнала имеет тенденцию роста в первые 72 ч после облучения для образца с дозой облучения 300 Гр и 48 ч для образца с дозой 1000 Гр. Зависимость интенсивности сигнала от поглощенной дозы имеет прямолинейный характер в диапазоне исследованных доз. Значение g-фактора в точке пересечения контура производной с нулевой линией равно 2,013. По полученным данным можно предположить, что сахароза (сахар) является одним из лучших кандидатов среди твердых радиационно-чувствительных материалов для идентификации факта облучения с помощью ЭПР-спектрометрии

Просьба ссылаться на эту статью следующим образом:

Меджидов И.М., Полякова И.В., Горбатов С.А. и др. ЭПР-исследование кинетики распада свободных радикалов облученной сахарозы. Вестник МГТУ им. Н.Э. Баумана. Сер. Естественные науки, 2023, № 4 (109), с. 141--158. DOI: https://doi.org/10.18698/1812-3368-2023-4-141-158

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