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It is unclear whether these band pairs are deposited annually, making it difficult to accurately estimate age or provide estimates for longevity for many shark species.

The goal of the white shark ageing study, published January 8 in , was to determine the periodicity of band pair deposition in vertebrae of white sharks from the Northwest Atlantic Ocean using radiocarbon dating.

The technique uses the discrete radiocarbon pulse in the environment caused by the detonation of nuclear bombs in the 1950s and 1960s as a "time stamp".

Together, these efforts would provide new insights into the cycling of molecules within the DOC, and help constrain the cycling of the largest reservoir of reduced carbon in the ocean. These efforts in obtaining novel observations and interpretations are fundamental to constraining the origin, persistence, and fate of organic molecules in the sea, and hence their significance within the global carbon cycle. Cameron's interests include instrument and method development and their application to geochemical research. Hawkes and colleagues want to look back over the past 10,000 years in the geologic record to get a detailed understanding of the full range of possible hurricane scenarios.

The resulting standard value, A The first standard, Oxalic Acid SRM 4990B, also referred to as HOx I, was a 1,000 lb batch of oxalic acid created in 1955 by the National Institute of Standards and Technology (NIST).

Since it was created after the start of atomic testing, it incorporates bomb carbon, so measured activity is higher than the desired standard.

Because of the fossil fuel effect, this is not actually the activity level of wood from 1950; the activity would have been somewhat lower.

The fossil fuel effect was eliminated from the standard value by measuring wood from 1890, and using the radioactive decay equations to determine what the activity would have been at the year of growth.