re illogical supervening influences on half life of samples i understand that the half life of a radio isotope is unaffected by temerature pressure etc but don't other radiological sources have an effect e g the atomic fallout from a meteorite or a supernova in a nearby star system it seems such events could trigger substantial 'non spontaneous' decay that would cause is discontinuity in the typical half life curve and set dates off by an order of magnitude also the level of c in the atmosphere could increase significantly in response to such events too making a sample appear younger than it really is no are there any reliable sources research on this