Determination of non-exchangeable organically bound tritium concentration in reference material of pine needles (NIST 1575a)
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Non-Exchangeable Organically Bound Tritium (Nx-OBT) in a biological reference material: NIST 1575a Pine Needles was determined by radiometry and noble gas mass spectrometry. Nx-OBT concentration ranged from 1.08 to 1.45 Bq L−1-combustion water (CW) (n = 4) with mean value (± S.D.) of 1.25 ± 0.15 Bq L−1-CW in radiometry and ranged from 1.12 to 1.35 Bq L−1-CW (n = 3) with mean value of 1.22 ± 0.25 Bq L−1-CW in mass spectrometry. For the Pine Needles reference material, there is no proposed value about Nx-OBT, but our results showed a good agreement with the data determined by different methods. Thus, it is useful material for the quality control of Nx-OBT measurements.
KeywordsNon-exchangeable Organically Bound Tritium Reference material Pine needle
This work was supported by the NIFS budget 10207004KOCA001, 10207004KOCA003 and 10203004ULAA024, and JSPS KAKENHI Grant Number 26340032 and 17K00559. The authors are grateful to Dr. Miklós Hegedűs (Hirosaki University, Japan) for important support and discussion.
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