Radiobiology > Physical Processes > Linear Energy Transfer [LET] > Linear Energy Transfer [LET]

Linear Energy Transfer [LET]

LET is the amount of energy transferred to the local environment in the form of ionizations and excitations.  Thus, LET indicates the potential for biologically important damage from radiation.

Linear Energy Transfer can be thought of in two ways: 

  • an average energy for a given path length traveled or 
  • an average path length for a given deposited energy. 
The standard unit of measure is keV/um.


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