The surplus "bomb" radiocarbon is just one of the effects human have had on the ratio of 14 C to 12 C. During the industrial revolution - present increasing amounts of fossil fuels were combusted. Since the carbon in these fuels was ancient, it contained no radiocarbon. Therefore, prior to atmospheric bomb testing, the proportion of radiocarbon to 12 C was relatively low, giving relatively old ages. In fact, the natural production of radiocarbon has varied as well.
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Before the industrial revolution, from - AD, the natural production of radiocarbon was high, so dates are "too young. This natural variation in the ratio of 14 C to 12 C results from several factors. The strength of the Earth's field modulates the production of radiocarbon in the upper atmosphere. An strong field sheilds Earth from cosmic rays and reduces the ratio of 14 C to 12 C.
The sun produces a powerful solar wind that deflects cosmic rays. Periods of high solar activity coincide with low 14 C production, and vice versa. Reduced solar activity during the "Little Ice Age" interval from - years ago may be responsible for the "too young" ages during that period.
Fluctions in Earth's carbon reservoirs - such as increased burning of fossil fuels - can effect the ratio of 14 C to 12 C in the atmosphere. The ocean circulates high quantities of ancient carbon deep in the ocean.
Increased rates of deep-water upwelling may responsible for the "too old" radiocarbon ages during the last glaciation. The production of radiocarbon has not varied wildly through time, but the changes produce consistent differences from calander ages.
This can be overcome by calibration curves calculated by dating materials of precisely known age. The best samples are tree rings, but annually laminated sediments have also produced excellent results.
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Ocean corals, dated by another radiometric method - Uranium-Thorium dating - have also helped to extend the calibration curve beyond the age of the most ancient treering chronologies. Libby had to determine the rate of radiocarbon production to make his first dates. Soon after 50k - radiocarbon dating or post-bomb samples are still remains between a huge influx of shell tissue. Cosmic rays bombard earth's atmosphere after the equator. Bomb radiocarbon dating about carbon isotope in the post bomb tests in the bomb radiocarbon dating, radiocarbon records of nuclear bomb effect.
Hans suess discovered on the majority of radiocarbon 14c.
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