Could a huge solar event throw off radiocarbon dates?

A change in atmospheric carbon-14 could affect dates for material that formed during or near the event. But radiocarbon dating is calibrated against records such as tree rings, which preserve past changes in carbon-14. A sharp spike can make the calibration curve more complicated and affect precision, but it would not simply reset every date or shift the whole chronology by the same amount.

The key question is whether the event left a measurable signal. A substantial production change should be checked against independent records, including other cosmogenic isotopes and well-dated tree rings. If it appears in those records, it can be accounted for in calibration. If the record is incomplete or a sample falls in a tricky part of the calibration curve, the date may be less precise, so other dating evidence matters too.

Heat is a different issue. It does not neatly restart the carbon-14 clock. Strong heating can change or destroy organic material, and contamination can make a sample appear younger or older, depending on what got mixed in. That is a sample-quality problem, not a clean correction to its age. The material and the lab’s preparation methods both matter.