TABLE 5.3.1 Tritium Concentrations in the Troposphere and Lower Stratosphere in January 1958 (73°N Latitude) Sampling Altitude (kilofeet) 10 Tropopause Height (kilofeet) 27-31 T-Atoms per Gram Air x 107° 0.09 0.19. 0.61 0.37 Average = 0.32 20 27-31 0.12 0.06 0.51 0.21 Average = 0.23 30 31.0 0.46 31.0 0.19 28.1 0.46 29.5 0.31 29.5 0.42 27.2 ho , 0.52 Average = 0.39 26.6 1.24 26.6 1.89 41.1 1.82 41.1 2.16 31.1 1.88 28.1 2.43 28.1 5-DD 29.5 3.28 29.3 2.67 27-2 fend 5.15 Average = 2.61 ~ -

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