Evaluation of thallium quantity through grown NaI(Tl) crystal by Czochralski method

Abstract

Improvement of crystal performance is important for the nuclear instrumentation, medical imag ing and radiation measurement as industrial application. For achieving this aim, we developed to establish crystal growth process and design and fabricate crystal growth equipment. Finally, the single crystal scintilla tor of NaI (Tl) was grown successfully by the conventional Czochraski method and Thallium quantity was measured through grown crystal. The results showed Thallium losses by evaporation during crystal growth. Thus, the first part of grown NaI(Tl) (2.5 cm) has high light yield and is suitable for counter. The character istics of the grown NaI(Tl) were evaluated on the excitation, emission responses. Finally, grown crystal was used as scintillators in nuclear radiation detection, industrial applications and etc.