Elektron ve gama demetleri ile ışınlanmış soda-lime cam örneklerin optik özellikleri

Soda-lime cam örneklerin optik geçirgenlik ve soğurma spektrumları 8 MeV elektron ve γ-ışını demetlerine maruz bırakılması sonrasında çalışıldı. Elektron demeti üretimi için modifiye klinik LINAC kullanılırken buna karşılık γ-ışını kaynağı olarak Co-60 kullanıldı. Cam numunelerin optik özellikleri, farklı dozlar ve radyasyon türleri için analiz edildi. Her iki durumda da cam örneklerinde radyasyonun sebep olduğu renk merkezleri gözlendi. Dahası da, ışınlama kaynağı kapatıldıktan sonra zamana bağlı optik özellikler de elde edilerek bu renk merkezlerinin oda sıcaklığında bile yavaşça kaybolduğu gözlendi. 8 MeV elektron ve γ- ışını demetlerine maruz bırakılan örneklerin optik geçirgenlik spektrumu, görünür bölgede sıradışı sopurma bandı göstermektedir. Öte yandan, ışınlanmış numuneler 100 °C' nin üzerinde kısa bir süre fırınlanınca bu soğurma bantları neredeyse kaybolmaktadır.

Anahtar Kelimeler:

radyasyon, cam, gama, elektron demeti, Hızlandırıcı

Optical properties of the electron and gamma-ray irradiated soda-lime glass samples

Optical transmission and absorption spectra of Soda-lime glass samples were studied after irradiation by 8 MeV electron and γ-ray beams. We used modified clinical LINAC for production of electron beam whereas 60Co was used as a γ-ray source. Optical properties of glass samples were analyzed for different doses and radiation types. Irradiation induced color centers in the glass samples were observed in both cases. Moreover, time-dependent optical properties were also acquired after irradiation source was turned off and we observed that these colour centers disappear slowly even at room temperature. Optical transmission spectra of 8 MeV electron and γ-ray beam irradiated samples show spectacular absorption band in the visible region. On the other hand, these absorption bands nearly recover themselves when the irradiated samples are baked for a short time above 100 ◦C.

Keywords:

irradiation, glass, gamma, electron beam, accelerator,

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