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Uranium-thorium dating has an upper age limit of somewhat over 500,000 years, defined by the half-life of thorium-230, the precision with which we can measure the thorium-230/uranium-234 ratio in a sample, and the accuracy to which we know the half-lives of thorium-230 and uranium-234.

Note that to calculate an age using this technique the ratio of uranium-234 to its parent isotope uranium-238 must also be measured.

We're one of the oldest and best known dating communities on the web, and we have a unique, and very popular, secret weapon - our intelligent two-way matching feature.Thorium-230 is itself radioactive with a half-life of 75,000 years, so instead of accumulating indefinitely (as for instance is the case for the uranium-lead system), thorium-230 instead approaches secular equilibrium with its radioactive parent uranium-234.At secular equilibrium, the number of thorium-230 decays per year within a sample is equal to the number of thorium-230 produced, which also equals the number of uranium-234 decays per year in the same sample.Increase your circle of friends, locate the best areas to ride, or find that special someone.Visit our chat rooms and message board to instantly connect with members. Ruth’s Guide to Talking about Herpes (Paperback) New England Journal of Medicine article on Asymptomatic Shedding in Patients who report no prior history of HSV2 and article in Doctor’s Guide which explains the results in layman’s terms.

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