Radiometric method for dating rocks
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But now imagine that some geologic event disturbs things to make the lead escape.
In fact, this form of dating has been used to I am a Teacher, a learner and most important an Environmentalist who always believes “Knowledge increases by sharing and it keeps you enthusiastic and motivated.” Having done Ph. in Environmental Science and facing difficulties in finding appropriate books and material during courses and NET preparations; I decided to make this tutorials not only for students but for every Environment Lover.
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So when a mineral grain forms (specifically, when it first cools below its trapping temperature), it effectively sets the uranium-lead "clock" to zero.
Lead atoms created by uranium decay are trapped in the crystal and build up in concentration with time.
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If nothing disturbs the grain to release any of this radiogenic lead, dating it is straightforward in concept.