Medical Internal Radiation Dose (MIRD)

Steps in the MIRD Calculation

  • MIRD Calculation 1
  • MIRD Calculation 2
  • MIRD Calculation 3
  • MIRD Calculation 4

Source and target organs

Source and target organs

Below are the steps in calculating the MIRD:

  • Consider source organs and target organs –source organs are organs which radioactivity passes or resides through.
  • Calculate the cumulative activity in each source organ.
  • Look up physical data i.e. mass of target organ, radiation related data.
  • Calculate the absorbed dose for each source/target situation:

    D = A/m  (DSifi), where:
    A is the accumulated activity
    m is the mass of the target organ
    Di is the equilibrium dose constant
    fi is the absorbed fraction