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C-14 is produced in the upper atmosphere when nitrogen-14 (N-14) is altered through the effects of cosmic radiation bombardment (a proton is displaced by a neutron effectively changing the nitrogen atom into a carbon isotope).

It takes about 5,730 years for half of a sample of radiocarbon to decay back into nitrogen.

For almost a dozen years the University of California has been active in prosthetics research.

On the recommendation of the then Committee on Prosthetic Devices (now the Prosthetics Research Board) of the National Research Council, there was established in 1945, with the cosponsorship of the School of Medicine in San Francisco and the College of Engineering in Berkeley, the Prosthetic Devices Research Project (now the Lower Extremity Amputee Research Project), a program designed primarily for the purpose of conducting studies in several areas of importance to leg amputees, especially fundamental studies of the processes of human locomotion.

Accurate pointing and timing are required to permit the correlation of observations made with different instrument systems working in different wavelength intervals and located at places far apart.

The radiation must be spectrally analyzed so that the processes responsible for radiation emission can be identified.

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Having can be collected in short time intervals to permit rapid fluctuations in intensity to be detected.