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Thread: Nuclear Chemistry problem

  1. #1 Nuclear Chemistry problem 
    Forum Freshman
    Join Date
    Jun 2007
    Posts
    7
    Hi everyone!

    I have a nuclear chemistry problem that is driving me mad. It is supposed to have a simple answer. However, I have not been able to find it.

    -Considering that the activity of a 3 mg of a compound of 147Pm (half-life=2,65 years) is 10^7 desintegrations per second. What is the percentage of 147Pm in the compound?

    Thanks in advance for any help you can give me!


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  3. #2  
    Forum Bachelors Degree
    Join Date
    May 2007
    Location
    NC USA
    Posts
    488
    Well, I don't know if there is a simple answer to this question. If there is a way to do it by inspection, I just don't see it. You'll have to grind it out using the well-known formulas for dealing with radioactive decay.

    You'll find a review of the necessary formulas at this site, bottom of the page:

    http://www.answers.com/topic/radioac...cat=technology

    Don't forget to convert your units for consistency; that is, years and seconds. You'll also have to invoke Avogadro's number to relate number of particles with grams.

    Try it yourself, let us know how far you get.

    *


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  4. #3  
    Forum Freshman
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    Jun 2007
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    Thanks! I'll try.
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