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Linear Energy Transfer (LET) is a measure of the energy transferred to material as an ionizing particle travels through it. Typically this measure is used to quantify the effects of ionizing radiation on biological specimens or electronic devices.

For electronic devices for aerospace application the common unit is MeV * cm² / mg of material (The material is usually Si for MOS devices). [1] describes and quantifies the effects of radiation on electronic devices intended for use in space.