Abstract
Abstract A method for C-14 specific activity detection, characterized by simplicity and speed of sampling, was developed by CeSNEF – Department of Nuclear Engineering, Polytechnic of Milan. The method is designed to sample graphite reactor moderator elements at a rate up to 1 sample every 5 minutes without drilling or generating dusts of carbon which could be disperse in the air. It is able to sample about lg of graphite in 90 seconds using a voltaic arc, simply leaning a particular miniaturized combustion chamber against the graphite surface. The produced CO2 is sucked and trapped in a saturable chemical solution and then analyzed by liquid scintillation counting (LSC). The detection limit is a specific activity of 327 Bq g- 1 which typically represents 1:150 – 1:300 of irradiated graphite C-14 activation level.
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