OPTICAL STUDIES ON THALLIUM-ACTIVATED ALKALIIODIDE CRYSTALS
Absorption and emssion spectra of KI-Tl and NaI-Tl phosphors were investigated at both room and liquid air temperatures. In order to perform optical measurements on NaI-Tl, special caution was given to prevent the crystal surface from being clouded by moisture. In the absorption spectra of NaI-Tl, new bands due to the presence of thallium were found. Their maximum absorption coefficients seemed to vary with the square of the thallium concentrations. The similar fact was found by Yuster and Delbecq in their investigation on KI-Tl. In emission, both KI and NaI crystals containing high concentrations of thallium showed a subsidiary band overlapping the short wavelength tail of the hitherto observed main band. The relations between these absorption and emission bands were investigated and discussions were given in terms of an extended model proposed by Seitz. (auth)
- Research Organization:
- Kyoto Univ.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-001939
- OSTI ID:
- 4240245
- Journal Information:
- J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 14
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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