Technically we are still able to use radiocarbon dating for dates after 1950, at the reduced accuracy though. This is what I meant by "unusable", because other

Technically we are still able to use radiocarbon dating for dates after 1950, at the reduced accuracy though. This is what I meant by "unusable", because other dating techniques will work better. The calibration is there because the global 14C/12C ratio is not constant over the time, and the same procedure can be used given the recent history of ratios (that we do have). As far as I know, though, resulting error bars might be much larger than usual because the function from uncalibrated ("14C") years to calendar years is no more regular. For example see [1] where uncalibrated t2 and t3 can correspond to much larger periods than t1's; historically this happened only locally, but after 1950 it would be far more common. Still the radiocarbon dating can be used with this caveat [2]. [1] https://commons.wikimedia.org/wiki/File:Variations_in_calibration_results.png https://commons.wikimedia.org/wiki/File:Variations_in_calibr... [2] https://www.nytimes.com/2011/03/29/science/29qna.html https://www.nytimes.com/2011/03/29/science/29qna.html