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Calibration of Tritium Monitors Using Saturated Vapour of Tritiated Water

E. L. Grigorescu, A. C. Razdolescu, M. Sahagia, P. Cassette, M. Tanase

Fusion Science and Technology / Volume 48 / Number 1 / July 2005 / Pages 382-385

Technical Paper / Tritium Science and Technology - Tritium Measurement, Monitoring, and Accountancy

An original method, based on the continuous circulation in a closed circuit of saturated HTO vapour, is presented. The saturated vapour are obtained by bubbling from vials containing different tritium standard solutions (IFIN-HH-TDCR method). The main difference from the usual method, elaborated by Osborne, is the use of saturated vapour, which eliminates the measurement in liquid scintillator of the recovered non-saturated vapour. Tritium Monitors type MT-1 made in IFIN-HH were calibrated. The measurements were carried out for three levels of the activity concentration: 0.0180, 0.701 and 1.73 MBq.g-1. The mean response was R=2.25.10-13 A/(MBq m-3) with a relative combined uncertainty lower than 4%. The value agrees with the result obtained with the Osborne method, ROs=2.30.10-13A/(MBq m-3) and with the estimated theoretical value, 2.29 10-13A/(MBq m-3)

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