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What Is the Longest Known Half-Life? Discover Tellurium-128's Record

Explore the longest known half-life of Tellurium-128, lasting approximately 2.2 septillion years, and how scientists measure it.

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Video transcript

Tellurium-128 holds the record for the longest known half-life, approximately 2.2 septillion years (2.2 x 10^24 years). This half-life is so extensive that it's incredibly challenging to measure directly, relying instead on indirect scientific methods and estimations.

Questions and answers

  1. What is a half-life in radioactive decay?

    A half-life is the time required for half of the atoms in a radioactive substance to decay into another element or isotope.

  2. Why is Tellurium-128's half-life so difficult to measure?

    Tellurium-128's half-life is approximately 2.2 x 10^24 years, an enormously long period that prevents direct measurement, requiring scientists to use indirect estimation methods.

  3. Are there other isotopes with long half-lives?

    Yes, other isotopes like Xenon-124 and Samarium-147 also have very long half-lives, though none exceed the timescale of Tellurium-128.

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