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Each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life or, in other words, the time required for a quantity to fall to half of its starting value. At a certain temperature, the crystal structure has formed sufficiently to prevent diffusion of isotopes. As a member, you'll also get unlimited access to over 75, lessons in math, English, science, history, and more. Retrieved from " https: Homeostasis Higher Level 7: