Dating for scientists
Think of the nucleus as a pyramid of building blocks.
If you try to add extra blocks to the sides pyramid, they may stay put for a while, but they'll eventually fall away.
To read the time on this radioactive clock, scientists use a device called a mass spectrometer to measure the number of parent and daughter atoms.
The ratio of parents to daughters can tell the researcher how old the specimen is.
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Read on to see what it takes to date a fossil and what volcanic ash has to do with it.
Eventually, some of the blocks can fall away, leaving a smaller, more stable structure.
Once all the parents have become daughters, there's no more basis for comparison between the two isotopes.
Scientists can't tell whether the clock ran down a few days or millions of years ago.
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