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Development of the mini-ionization chamber for high-dose real-time monitoring inside a gamma irradiation facility

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3 Author(s)
Rodrigues, Ad.A. ; Embrarad-Empresa Brasileira de Radiacoes, Cotia, Brazil ; Vieira, J.M. ; Hamada, M.M.

A cylindrical ionization chamber of 0.9 cm3 has been developed for high-doses real-time monitoring during the sample irradiation at a static position in a 60Co gamma industrial plant, with about 25.9 PBq (700 kCi). Nitrogen gas at pressure of 1 bar was utilized to fill the ionization chamber for which an appropriate configuration was determined, to be used as a detector for high-dose measurements. The first detector tests were carried out using a 60Co Gammacell with about 0.26 PBq (7 kCi) and dose rates of 0.6, 1.8, and 2.6 kGy/h. These dose rates were reached with lead absorbers. A good linearity of the detector was found between dose and accumulated charge, independently of the different dose rates. The developed ionization chamber was suitable to be used as a real-time dosimeter for dose rates between 0.6 to 2.6 kGy/h at a 60Co gammacell, independently of the spectrum degradation caused by absorbers between 50%-90%.

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Nuclear Science, IEEE Transactions on  (Volume:50 ,  Issue: 4 )