Development and characterization of CsI(Tl) crystal for use as a radiation detector

Karoline Feitoza Suzart; Carlos Henrique Mesquita; Maria Conceição Costa Pereira; Margarida Mizue Hamada; Alexandre França

doi:10.15392/bjrs.v9i1A.1586

Authors

Karoline Feitoza Suzart Instituto de Pesquisas Energéticas e Nucleares
Carlos Henrique Mesquita
Maria Conceição Costa Pereira
Margarida Mizue Hamada
Alexandre França

DOI:

https://doi.org/10.15392/bjrs.v9i1A.1586

Keywords:

Scintillator Detector, Crystal, Response Function

Abstract

Cesium 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 ( c 12.3 mm x 19.5 mm). The scintillator response was studied through five gamma radiation sources: ^99mTc (140 keV), ¹³⁷Cs (662 keV), ⁶⁰Co (1173 keV, 1333 keV) and ²²Na (511 keV, 1275keV). 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 ^99mTc source. The energy resolution of the crystalline detector was determined by the FWHM parameter, corresponding to the photopeak width at half of its height. Gamma radiation was spectrometry performed with the following sources: ^99mTc, ²⁴¹Ba, ¹³⁷Cs, ⁶⁰Co and ²²Na.

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