Growth and Evaluation of Improved CsI:Tl and NaI:Tl Scintillators

Scintillators play an important role in radiation detection and imaging. Thallium-doped cesium iodide (CsI:Tl) sodium (NaI:Tl) are two of the major scintillators that have been used for many applications decades. In this paper, we will present improved scintillation performance Bridgman method-grown CsI(Tl) NaI(Tl) crystals developed by Xtallized Intelligence, Inc. (XI, Inc.), compare with commercially available CsI:Tl NaI:Tl. a preliminary testing using MicroFJ−60035−TSV silicon photomultipliers (ON Semiconductor), newly 12.5 × 6 mm3 crystal has shown energy resolution 4.8% (FWHM) at 662 keV, compared to 7.2% obtained size 25 mm3. The 5.4% keV is NaI:Tl crystal, 7% ∅1″ 1″ NaI(Tl). comparison photo peak channel locations shows improvements both NaI:Tl, XI, Inc., produced much larger signal amplitudes (roughly double), when Improved decay time constants presented as well.