Author/Authors :
Hara، نويسنده , , Kazuhiko and Ishii، نويسنده , , Mitsuru and Kobayashi، نويسنده , , Masaaki and Nikl، نويسنده , , Martin and Takano، نويسنده , , Hideaki and Tanaka، نويسنده , , Masashi and Tanji، نويسنده , , Kiyokazu and Usuki، نويسنده , , Yoshiyuki، نويسنده ,
Abstract :
We achieved a significant increase in the ingot size of La-doped PbWO4 single crystals to 65 mm in diameter and 300 mm in length by using the Czochralski technique and three times of recrystallization. Four blocks each with a typical size of 20×20×230 mm3 were taken from an ingot. The optical as well as the scintillation characteristics of the large-size crystals, including the radiation hardness, were found to be similar to or even better than those of smaller crystals. The radiation-induced absorption coefficient μir was as small as 0.5–1 m−1 at 107 rad of 60Co γ-ray irradiation.
