Progress of Cryogenics and Isotopes Separation

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The National Conference with international participation on New Cryogenic and Isotope Technologies for Energy and Environment - EnergEn 2018 is organized by the National Research-Development Institute for Cryogenic and Isotopic Technologies - ICSI Rm. Valcea with the scientific participation of the University of Pitesti and the University of Craiova and will be held at Baile Govora, in 2018.

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CAN STILL BE APPLIED LIQUID SCINTILLATION COUNTING TO ENVIRONMENTAL WATER SAMPLES FOR TRITIUM MEASUREMENT?

Carmen Varlam , Ioan Stefanescu, Gheorghe Ionita, Ionut Faurescu, Diana Bogdan, Denisa Faurescu

National Research and Development Institute for Cryogenics and Isotopic Technologies - ICIT Rm. Valcea, code 240050 - Rm. Valcea, Uzinei 4, CP7 Raureni, Valcea, Romania, phone: 0040 250 736979, fax: 0040 250 732746, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


ABSTRACT

The general decreasing trend of tritium level in the environment makes the use of the direct liquid scintillation method difficult. In this paper are presented experiments, which were performed in our laboratory to establish the routine procedure for tritium concentration determination in the environmental water samples by liquid scintillation counting (LSC). A low-level liquid scintillation spectrometer Quantulus 1220 is used in this work. The methods applied to determine counting efficiency are as follow: Spectral Quench Parameter of External Standard Method and Internal Standard Method. A comparison between dilution factors of heavy water samples, calculated both for D/(D+H)% concentration and tritium activity measured by the two methods, is discussed in the paper. The two standard recommendations that specify a method for determining tritium concentration in water sample by LSC have been investigated and the conclusions are shown. We decide to apply ISO method, and internal standard method for efficiency determination, for our routine procedure. Even if the uncertainty of the method is high, and even if tritium concentrations in the environment continue to decrease, the direct measurement of tritium concentration in water sample can still be a more rapid and cheaper measurement method for environment.

KEYWORDS: tritium, low level counting