SUZART, K.F.VELO, A.F.HAMADA, M.M.PEREIRA, M.C.C.MESQUITA, C.H.2021-08-132021-08-132021SUZART, K.F.; VELO, A.F.; HAMADA, M.M.; PEREIRA, M.C.C.; MESQUITA, C.H. Characterization of the CsI(Tl) crystalline scintillating detector produced at IPEN. <b>Brazilian Journal of Radiation Sciences</b>, v. 9, n. 1A, p. 1-13, 2021. DOI: <a href="https://dx.doi.org/10.15392/bjrs.v9i1A.1586">10.15392/bjrs.v9i1A.1586</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/32151.2319-0612http://repositorio.ipen.br/handle/123456789/32151Cesium iodide crystal activated with thallium (CsI(Tl)) is used as radiation sensor because of its favorable characteristics as scintillator, when excited by gamma radiation. This crystal has good mechanical strength and it is relatively little hygroscopic. In the present work, the CsI(Tl) crystal was grown in the Nuclear Energy Research Institute (IPEN/CNEN/SP) by Brigdman technique, in two different formats: (a) cylindric (∅ 20.1 mm x ↑ 11.9 mm) and (b) parallelepiped (12.3 mm x ↑ 19.5 mm). The scintillator spectrometry was studied through five gamma radiation sources: 99mTc (140 keV), 133Ba (355 keV) 22Na (511 keV) and 137Cs (662 keV). The crystals were coupled to a photomultiplier tube using 0.5 McStokes viscosity silicone grease as the optical interface. All electronics for signal measurements were developed at IPEN. Luminescence property of the CsI(Tl) crystal was excited by the radiation from a 137Cs source. The energy resolution of the crystalline detector was determined by the FWHM parameter, corresponding to the photopeak width at half of its height.1-13openAccessbarium 133cesium 137sodium 22technetium 99thalliumiodidescrystalsluminescenceradiation detectorsArtigo de periódico1A910.15392/bjrs.v9i1A.15860000-0002-6879-24680000-0001-9786-4136Sem Percentil