Title: Development of the mini ionization chamber for high dose monitoring on line inside a gamma irradiation facility
Abstract: A cylindrical ionization chamber of 0.9 cm/sup 3/ has been developed for monitoring high doses on line during the sample irradiation at a static position in a /sup 60/Co gamma industrial plant, with about 25.9 PBq (700 kCi). Nitrogen gas at pressure of 1 bar was utilized to fill the ionization chamber and to determine an appropriate configuration to be used as a detector for high dose measurements. The first detector tests were carried out using a /sup 60/Co Gammacell with about 0.26PBq (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 caused by lead absorbers. The developed ionization chamber showed suitable to be used as a dosimeter on line for doses between 1 to 6 kGy at a /sup 60/Co Gammacell independently of the spectrum degradation caused by absorbers between 50 to 90%.
Publication Year: 2003
Publication Date: 2003-11-20
Language: en
Type: article
Indexed In: ['crossref']
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