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Homework Help: Archived Time estimation - mass spectrometer

  1. Nov 8, 2012 #1
    Hi everyone

    1. The problem statement, all variables and given/known data

    I want to seperate isotopes of uranium with some kind of a mass spectrometer. The isotopes are
    Mass numbers 95
    Atom numbers 235 and 238


    How long does it take to extract 1kg of the 235 isotope if I have a ray of charged ions (charge = e) when the beam current is I=1mA ?

    2. Relevant equations


    3. The attempt at a solution

    I searched for the mass of an atom of uran (238.0289 u). Then I calculated how much atoms I have by dividing the mass 1kg by the mass of one atom.

    The euqation for the current is:
    [tex] I= \frac {eN}{t}[/tex]

    wheres e is the charge of an electron
    N is the number of atoms
    and t the time.

    Now I solved the equation for t and used the given numbers.

    Is this attempt right?
    (my solution is t=1.13*10^5)

    Thanks for your help.
  2. jcsd
  3. Feb 6, 2016 #2


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