[en] Scintillator detectors using CsI(Tl) show high gamma ray detection efficiency for unit volume. New developments of Si-photodiode with low capacitance, large sensitivity area and with an emission spectra distribution matching the CsI(Tl) luminescence spectra have stimulated the use of this CsI(Tl) crystal as scintillator. In this work, the CsI(Tl) crystal grown by the Bridgman technique and its characterization and evaluation as scintillator were described. To evaluate the developed scintillator, measurements of luminescence emission spectra, optical transmission spectra, luminescence decay time, global counting rate efficiency and energy resolution for gamma rays were carried out. The measurements of energy resolution were performed with a CsI(Tl) scintillator coupled to a PIN photodiode and using the following gamma ray sources ¹³⁷Cs, ⁶⁰Co, ²²Na, ⁵⁴Mn and ¹³¹. For comparison, the same evaluation measurements using a bi-alkaline photomultiplier were also carried out. From the experimental results of this work, we can conclude for the effectiveness of the scintillator CsI(Tl) coupled to a PIN photodiode for applications in the area of radiation detectors. (author)