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Homework Help: Nuclear Chemistry

  1. Apr 22, 2007 #1
    1. The problem statement, all variables and given/known data

    If X radiation ionizes 26.2 X 1012 atoms per cemtimeter cubed, what is the ionizing intensity of the radiation measured in roentgens ?

    2. Relevant equations

    3. The attempt at a solution

    Help, I have never seen atoms per centimeter cubed before, I know that 1 roentgens is 93.3e-3 J/g, but I don't know how to get atoms per centimeter cubed to that?
  2. jcsd
  3. Apr 23, 2007 #2


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    Science Advisor
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    this from Wiki:

    "It is the amount of radiation required to liberate positive and negative charges of one electrostatic unit of charge in 1 cm³ of air at standard temperature and pressure (STP). This corresponds to the generation of approximately 2.08×10^9 ion pairs."

    You must determine how many ion pairs are generated per ionization event.
    eg. 26.2 X 10^12 atoms generates how many ion pairs?
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