Radiometric dating and astronomical dating
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However, this helium gas easily leaks out of the host minerals.Thus two age estimates can be calculated for these mineral grains—one based on radioactive decay of uranium to lead, and the other based on the rate at which the helium leaks out of the mineral grains.
Carbon 14 dating: Carbon 14 dating method measures the time since a living organism has died.Because polonium has a fleeting existence, the polonium radiohalos had to have formed within hours and days.
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