Linear Energy Transfer Let. It describes the action of radiation into matter. In a refined study and redefinition of let or restricted linear collision stopping power a quantity symbolized by the letter l with subscript greek letter delta l δ is defined as equal to the fractional energy lost de per unit distance traversed along the track dl or l δ dedl δ in which the subscript delta δ indicates that only collisions with energy transfer less than an.
Linear energy transfer let the amount of energy per unit length lost by a particle or photon traversing a material. Linear energy transfer let energy loss with electrons s el dedx z2 v2 schardt and elsässer rev mod phys 82 2010 let is only defined for monoenergetic beams karger and scholz pmb 01tr02 2018 in a realistic field let typically refers to the dose averaged value over the i th particle energy spectrum is related to unrestricted. Alpha particles protons and neutrons produce greater.
This is because the living tissue can more easily repair damage from radiation that is spread over a large area than that.
Linear energy transfer is the average radiation energy deposited per unit path length along the track of an ionizing particle. The let for electrons is traditionally expressed in units of mevcm or when divided by the mass density in units of mev cm 2 g. Higher let radiations particles. The linear energy transfer let of a medium for charged particles is the quotient of dedl where de is the energy lost by a charged particle due to electronic collisions in traversing a distance dl.