By National Council on Radiation Protection and Measurements
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Extra resources for Carbon-14 in the Environment: Recommendations of the National Council on Radiation Protection and Measurements (N C R P Report)
The net primary production is the amount of carbon stored in plant tissue after respiration. 2 illustrates that continental plants contain essentially all of the world's living carbon, 90 percent of it residing in the forests, but only 66 percent of the global net primary production. 02 percent of the global plant carbon (Whittaker and Likens, 1973). Baes et al. (1976), in Fig. 1 DISTRIBUTION OF CARBON AND CARBON-14 / 29 3) Non-Woods, summed over all latitudes, with 540 x 10" kg of slowly exchangeable C and 40 x 10" kg rapidly exchangeable C.
The thermocline, which extends about 1000 meters below the surface layer, is a relatively stagnant zone stabilized by decreasing temperature and increasing density with depth. The deep ocean, which is the third and largest compartment, extends to a n average depth of 4 km and is isolated by the thermocline. 1 DISTRIBUTION OF CARBON AND CARBON-14 1 31 The predominant form of carbon in the ocean is dissolved inorganic material. , dissolved C02 and H2C03). 1 mmol/L in the deep ocean (Broecker and Li, 1970).
Present photomultiplier tubes and solid state circuits have greatly reduced the background and increased the stability characteristics of liquid scintillation spectrometers over systems available before 1970. The presently available liquid scintillation counters are capable of detecting I4Cwith an efficiency of greater than 90%. The corresponding background would range from 5 to 25 counts/ min depending on the degree of the optimization of the system. A detailed discussion of liquid scintillation techniques is provided in other NCRP Reports (NCRP 1976, 1978) and by Bransome (1970), Dyer (1971), Crook et al.