Oy...

Jan. 14th, 2015 08:43 pm
ffutures: (marcus 2013)
[personal profile] ffutures
NCIS New Orleans has someone talking about carbon dating silver coins to the mid 1700s.

Carbon dating silver? Really?

Date: 2015-01-14 10:42 pm (UTC)
ext_196996: My avatar (Default)
From: [identity profile] johnreiher.livejournal.com
It would only work if they were encrusted with organic material. You could date that. But bright shiny silver coins? Not so much.

Date: 2015-01-15 12:46 am (UTC)
From: [identity profile] ffutures.livejournal.com
They're on the sea bed, so any organic matter could have been there a couple of centuries or ten minutes before recovery.

Date: 2015-01-15 10:45 am (UTC)
From: [identity profile] pauldormer.livejournal.com
There was a case many years ago of a corpse being found in a bog and it was linked to a missing woman, whose husband was accused of her murder. Then carbon dating showed it was an Iron Age bog burial. Peter Garratt got a story out of this which appeared in Interzone; I remember talking to him about it.

But later research showed that there is so much organic matter in a bog that it contaminates carbon dating and the corpse actually was only a few years old.

Date: 2015-01-15 10:49 am (UTC)
From: [identity profile] ffutures.livejournal.com
Doesn't surprise me - carbon dating is only reliable when there is nothing else around to contaminate things. CSI and other TV shows have a lot to answer for, they make these tests look unambiguous, and often there are all sorts of grey areas.

Date: 2015-01-15 11:53 am (UTC)
From: [identity profile] pauldormer.livejournal.com
There was an article I remember reading a few years back, think it was in Scientific American, referring to the CSI effect. Jurors in trials are so influenced by these shows that they expect all these tests to be carried out, even when they are irrelevant or would give ambiguous results.

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