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For a substance to be suitable for c-14 dating, it obviously should have carbon in it that was recently living. C-14 has a half-life of around 5700 years, and thus is suitable for much material of interest to antiquity. Say 50-60 000 years.
Recent material may be contaminated by effects from atomic bombs.
As to selecting your material, it should be suitable for your enquiry. For example, some fire charcoal may well be quite useless, as it may have come from a log that took hundreds of years to float down a river, and which was a further few hundreds of years old before it died.
Again, the Turin Shroud had been mended, and obviously you'll get a very different answer from the different fabrics.
The various laboratories that do this work have advice as to the selection and conservation of field material.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoCarbon 14
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