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Homework Help: Radioactive Decay

  1. Apr 24, 2010 #1
    If isotope A decays to isotope B.
    Does it mean that if within 1 hour we have 10 mg of A that decays, do we get exactly 10 mg of B after one hour?

  2. jcsd
  3. Apr 24, 2010 #2


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    That depends. In alpha decay, isotope A would decay to isotope B plus a helium nucleus, which escapes, so isotope B would weigh slightly less. In beta and gamma decay, the mass change is insignificant.
  4. Apr 24, 2010 #3
    This is Beta decay.

    so I guess 10 mg of A will give me approx. 10 mg of B.
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