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The amount of Ar is also measured to assess how much of the total argon is atmospheric in origin. 11) the following assumptions must be true for computed dates to be accepted as representing the true age of the rock: Both flame photometry and mass spectrometry are destructive tests, so particular care is needed to ensure that the aliquots used are truly representative of the sample.Ar–Ar dating is a similar technique which compares isotopic ratios from the same portion of the sample to avoid this problem.

Although it finds the most utility in geological applications, it plays an important role in archaeology.

Unfortunately the visibility of safer alternatives to more traditionally used toxic chemicals has been low – until now.

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Due to the long half-life, the technique is most applicable for dating minerals and rocks more than 100,000 years old.

For shorter timescales, it is unlikely that enough argon-40 will have had time to accumulate in order to be accurately measurable.




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