5 NATURAL ABUNDANCE OF THE STABLE ISOTOPES ... - Falw.vu

Chapter 77.4.3 REPORTING 2 H VARIATIONS AND THE 2 H STANDARDVSMOW is the standard for 2 H/ 1 H as it is for 18 O/ 16 O ratios. Values for the absolute 2 H/ 1 Hratio of VSMOW and SLAP are reported to be (155.76 ± 0.07)10 6 and (89.02 ± 0.05)x10 6 ,respectively, by Hagemann et al. (1970), (155.75 ± 0.08)10 6 and (89.12 ± 0.07)10 6 byDe Wit et al. (1980), and (155.60 ± 0.12)10 6 and (88.88 ± 0.18)10 6 by Tse et al. (1980).Table 7.5The stable and radioactive isotopes of hydrogen: practical data for the natural abundance,properties, analytical techniques and standards. Further details are given in Sect.7.4 and8.3, and in Chapters 10 and 11.MS=mass spectrometry, PGC=proportional gas counting, LSS=liquid scintillationspectrometry, AMS=accelerator mass spectrometry1 H2 H3 Hnatural abundance 0.99985 0.00015 < 10 17stability stable stable radioactivenatural specific activity< 1.2 Bq/L waterdecay mode / daughter / 3 Hehalf-life (T 1/2 )decay constant ()max. energyabundance range12.320 ± 0.022 a5.57610 2 /a = 1/18.33 a 118 keV250‰ 0 to 10 16in hydrological cyclereported as2 or 2 H or D3 Ain ‰ TU, Bq/L H 2 Oinstrument MS PGC, LSSanalytical medium H 2 H 2 O, C 2 H 6 , C 6 H 6usual standard deviation 0.5‰ 1% at high levelinternational standard VSMOW NBS-SRM 4361with absolute value2 H/ 1 H = 0.000155753 H/ 1 H = 6600 TUor = 0.780 Bq/g H 2 Oas of Jan.1, 1988118