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This results in a coating of filamentous carbon (usually referred to as graphite) on the powdered catalyst—typically cobalt or iron.
How much sample material is needed to perform testing depends on what is being tested, and also which of the two testing technologies is being used: detectors that record radioactivity, known as beta counters, or accelerator mass spectrometers (AMS).
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It is also possible to test conchiolin, which is an organic protein found in shell, but this only constitutes 1-2% of shell material. Libby's first measurements were made with lamp black, The steps to convert the sample to the appropriate form for testing can be long and complex.Calcium carbonate is very susceptible to dissolving and recrystallizing; the recrystallized material will contain carbon from the sample's environment, which may be of geological origin.
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