TABLE 3

INVENTORIES OF COSMOGENICALLY PRODUCED TRITIUM ( 3 H)

Half-life     12.33 years
Production Rate (atoms·cm -2 ·s -1 )
   Troposphere    8.4 × 10 -2
   Total Atmosphere   0.25
Global Inventory    3.5 kg (1300 PBq) (as of 1967) Other Reported Global Inventory Calculations
Distribution (%)
   Stratosphere
   Troposphere
   Biosphere/land surface
   Mixed ocean layer
   Deep ocean layer
   Ocean sediments

Concentration
   Stratosphere
   Troposphere
   Oceans
   Oceans

Method of Production

Main Radiation


6.8
0.40
27.0
35.0
30.0
0


0.10 Bq/kg air
0.00012 Bq/kg air
0.00067 Bq/kg water (average)
0.11 Bq/kg water (surface water)

Spallation processes; Target nuclei 14 N and 16 O

18.6 keV

Atmospheric Production Rate
(atoms·cm -2 ·s -1 )


0.10-0.20
0.12
0.14
1.2
1.06
0.9
0.75
0.6-1.3
0.25-0.35

Inventory
(PBq)


500-1000 (as of 1953)
600 (as of 1954)
700 (as of 1955)
6300 (as of 1957)
5500 (as of 1958)
4800 (as of 1958)
3700 (as of 1958)
3000-7000 (as of 1961)
1300-5500 (as of 1962)

Notes : (1) Inventory per Teegarden (1967).

    (2) Multiple inventory estimates for the same year indicate different investigators.


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