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24-Dec-2020 23:44

Another way of expressing this is the half-life period (given the symbol T).

Others place mineral grains under a special microscope, firing a laser beam at the grains which ionises the mineral and releases the isotopes.

This technique is used on ferromagnesian (iron/magnesium-containing) minerals such as micas and amphiboles or on limestones which also contain abundant strontium.



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