Sentences with phrase «radioactive particle samples»
The scientists brought their 1.55 metre cores to the surface in 1993, but it has taken another two decades for laboratory techniques to detect and interpret the significance of radioactive particle samples in the rock that could only have come from outer space — which is why scientists think the bedrock must have been exposed, possibly more than once.
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Taking samples of such speleothems from six caves, the researchers then reconstructed the last roughly 500,000 years of climate via the decay of radioactive particles in the stone.