Author/Authors :
Sasano، نويسنده , , M. and Nishioka، نويسنده , , H. and Okuyama، نويسنده , , S. and Nakazawa، نويسنده , , K. and Makishima، نويسنده , , K. and Yamada، نويسنده , , S. and Yuasa، نويسنده , , T. and Okumura، نويسنده , , A. and Kataoka، نويسنده , , J. and Fukazawa، نويسنده , , Y. and Hanabata، نويسنده , , Y. and Hayashi، نويسنده , , K.، نويسنده ,
Abstract :
Light collection efficiency from BGO crystal scintillators of various sizes and shapes was measured by reading them using 1×1 cm2 avalanche photo diodes. When the crystals have simple geometry, the light collection efficiency was found to depend on their size, shape and the read-out position through a rather well-defined empirical scaling relation. The light collection efficiency of tapered crystals was seen to depend on both the position of γ - ray irradiation, and the read-out position of the avalanche photo diodes. Using optical Monte-Carlo simulations, the relation was reproduced assuming plausible proper parameters for surface conditions and the attenuation length. This results were reproduced with a reasonable accuracy by optical Monte-Carlo simulations. Simple physical explanations are given to these geometrical effects.
