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Relationship between dose rate and amount of radioactive particles

  1. Feb 7, 2013 #1

    This might be a silly question but I've been struggling to find this out.

    What is the relationship between dose rate and the amount of Cs-137 in an area?

    if I know the exposure dose of the area is 5mSv, how can I work out how much Cs-137 is in this area?

  2. jcsd
  3. Feb 8, 2013 #2


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    Staff: Mentor

    5mSv in what time frame?
    In addition, it depends on the location of Cs-137. Is it in the ground, or in the air, or somewhere else? How deep in the ground? ...

    For a rough estimate of the activity, you can divide the number of Cs-137-atoms in some volume by the lifetime to get the decays per time and volume. Multiply it with the decay energy to get the released energy per time and volume.
  4. Feb 12, 2013 #3
    We would need to know the length of time of exposure, the location of the source from the measurement point and any potential medium that the sourced energy must travel through.
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