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for laser replacement U series dating
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we can analyze relatively large samples
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such as a complete tooth
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without any chemical pretreatment
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hero tooth is pressed into the sample holder
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so that the top is flush with the holder
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which is the focal plane for the laser
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we had some standards to the holder
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the holder is then inserted into the laser
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ablation cell
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all air needs to be removed from
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the laser ablation cell otherwise
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the plasma from the mass spectrometer will extinguish
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the cell is fully computer controlled
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allowing us to program where exactly we want to analyze
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the laser is fixed
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and the cell moves according to the program sequence
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this sequence can involve more than 100
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distinct measurements
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the laser has a camera attached
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so that we can cross check where the sample is ablated
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a few seconds after the laser is switched on
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we can see the traces of
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the isotopes we are interested in
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on the computer screen of the mass spectrometer
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ages are calculated by comparing
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the measured isotopes of the sample
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with those of the standard
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here we see the result of a sample that was analyzed
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with 30 distinct spot analysis
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