Determination of the region of sensitivity of a scintillator detector NaI(Tl) (2 X 2)” submerged in water

• Autor(a) principal: Brandão, Luis Eduardo Barreira
• Data de Publicação: 2015
• Outros Autores: Instituto de Engenharia Nuclear
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional do IEN
• Texto Completo: http://carpedien.ien.gov.br:8080/handle/ien/2342
• topic: INAC 2015; Radioactive tracers

This paper presents the development of a methodology used to calculate the region of sensitivity of a scintillator detector NaI(Tl) (2 x 2)” submerged in water. The procedure was based in the simulation of a radioactive cloud (radiotracer), emitting anisotropy photons, that approximate of the submerged detector. This detector will be fixed into large industrial mixing. The detector registers the increase of the number of photons, because the solid angle and concentration of radiotracer also increase. Considering the absence of data in the literature, the methodology presented has your adequacy verified indirectly with a simple geometry that consists in a circular detector and one disk source in front of the detector. The theoretical and experimental tests were used for the determination of the region of sensitivity. The Simpson integration Method was used for the solid angle calculations and Monte Carlo Method was used for the validation of the employed geometry. The two methods were compared showing an error between 1.5% and 5%. In the experimental test was employed one disk source of the 137Cs, with radius of 1.2 cm and a collimated and not collimated scintillator detector NaI(Tl) (2 x 2)”. The counts were registered in three different plans enabling to determine the region of sensitivity of the detector.