TABLE 5a

BACKGROUND INVENTORY OF COSMOGENICALLY PRODUCED CARBON ( 14 C)

Half-life 5730 years
Production Rate (atoms·cm -2 ·s -1 )

Troposphere

Total Atmosphere



1.1

2.5




1.5 Bq/year
Global Inventory 6.8 × 10 4 kg 1100 PBq (as of 1967)
Distribution (%)

Stratosphere

Troposphere

Biosphere/land surface

Mixed ocean layer

Deep ocean layer

Ocean sediments



0.30

1.6

4.0

2.2

92.0

0.4





Concentration

Stratosphere

Troposphere

Oceans



-- Bq/kg air

-- Bq/kg air 0.0048Bq/kg water

Method of Production Spallation processes; Target nuclei 14 N and 16 O

Main Radiation 166keV


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