linear energy transfer (LET)

This term is defined in ECSS-E-ST-10-04C as
rate of energy deposit from a slowing energetic particle with distance travelled in matter, the energy being imparted to the material

This term is defined in ECSS-E-ST-10-12C as
rate of energy deposited through ionisation from a slowing energetic particle with distance travelled in matter, the energy being imparted to the material