Comparative evaluation of soda glasses that are exposed by the different radiation sources


Dogan N., Tugrul A.

15th European Triga Conference, Espoo, Finlandiya, 15 - 17 Haziran 1998, cilt.197, ss.81-102 identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 197
  • Basıldığı Şehir: Espoo
  • Basıldığı Ülke: Finlandiya
  • Sayfa Sayıları: ss.81-102

Özet

Soda glasses have been exposed by different type of radiation sources, but approximately in the same doses. Then the colors of the glasses have turned into dark hues. The glass samples have been irradiated in two different places of ITU TRIGA Mark II Reactor. The first place is central thimble, and the second place is tangential beam tube of the reactor. In the central timble, the glasses are exposed by different type of radiation in the same time. In this experiment, neutrons and gamma rays are mainly effected on the glass samples. In the tangential beam tube, it can be though that the irradiation has been done only by using neutrons because of the placed neutron radiography device in that tube. This devices has a bismuth filter in the beginning of tube and the gamma rays are absorbed. Therefore, the irradiation beam has neutron beam only. For the comparation, a similar glass samples have also been irradiated by Co-60 gamma sources. Irradiation dose levels are similar for each irradiation and the glass colors are changed. In the results of the study; after the high level irradiation, properties of visible light transmittance and reflectance are determined between 380 nm and 780 nm wavelengths for all glasses. Changing rate of the parameters for the soda glasses are evaluated according to each other and unexposed glasses comparatively. In this study, changing rate of colours are determined on the colour maps. The spectroscopic measurements have been done for visual electromagnetic spectrum. Colour coordinates, purity, brightness and dominant wavelengths are determined and results of them evaluated comperative with the unexposed glass.