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But this scheme is not used because 40 Ca can be present as both radiogenic and non-radiogenic Ca. Another way of expressing this is the half-life period given the symbol T. The Swedish National Heritage Board. Snelling, A. Furthermore, Fleischer et al. The mathematical expression that relates radioactive decay to geologic time is [14] [16]. Astronomers wait years for robotic explorers to bring back samples of asteroids — but sometimes, asteroids come to us.

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