Standardization of Tc-99 by two methods and participation at the CCRI(II)-K2. Tc-99 comparison.
The work accomplished within the participation at the 2012 key comparison of Tc-99 is presented. The solution was standardized for the first time in IFIN-HH by two methods: LSC-TDCR and 4π(PC)β-γ efficiency tracer. The methods are described and the results are compared. For the LSC-TDCR method, the program TDCR07c, written and provided by P. Cassette, was used for processing the measurement data. The results are 2.1% higher than when applying the TDCR06b program; the higher value, calculated with the software TDCR07c, was used for reporting the final result in the comparison. The tracer used for the 4π(PC)β-γ efficiency tracer method was a standard (60)Co solution. The sources were prepared from the mixture (60)Co+(99)Tc solution and a general extrapolation curve, type: N(βTc-99)/(M)(Tc-99)=f [1-ε(Co-60)], was drawn. This value was not used for the final result of the comparison. The difference between the values of activity concentration obtained by the two methods was within the limit of the combined standard uncertainty of the difference of these two results.
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, IFIN-HH, Bucharest. 30 Reactorului Str. Magurele RO 0-77125, jud. Ilfov, POB MG-6, Romania. Electronic address: msahagia@nipne.ro.
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Sahagia
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, IFIN-HH, Bucharest. 30 Reactorului Str. Magurele RO 0-77125, jud. Ilfov, POB MG-6, Romania.
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Antohe
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, IFIN-HH, Bucharest. 30 Reactorului Str. Magurele RO 0-77125, jud. Ilfov, POB MG-6, Romania.
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Ioan
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, IFIN-HH, Bucharest. 30 Reactorului Str. Magurele RO 0-77125, jud. Ilfov, POB MG-6, Romania.
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Luca
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, IFIN-HH, Bucharest. 30 Reactorului Str. Magurele RO 0-77125, jud. Ilfov, POB MG-6, Romania.
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Ivan
4π(PC)β-γ efficiency tracer method; CCRI(II)-K2.Tc-99 comparison; LSC-TDCR