Linear energy transfer
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Linear energy transfer (LET)is the average (radiation) energy deposited per unit path length along the track of an ionising particle. Its units are keV/μm.
Linear energy transfer describes the energy deposition density of a particular type of radiation, which largely determines the biological consequence of radiation exposure.
The LETlinear energy transfer of a chargedcharged particle2 is ∞ Q2/Ek
-
LETlinear energy transfer is proportional to the square of the charge of the particle -
LETlinear energy transfer is inversely proportional to the particle's kinetic energy
High LETlinear energy transfer radiations: LETlinear energy transfer 3-200 keV/μm
- commonly mediated by:
- greater density of interactions at cellular level
- more likely, than low
LETlinear energy transfer, to produce biological damage in a given volume of tissue
Low LETlinear energy transfer radiations: LETlinear energy transfer 0.2-3 keV/μm
- commonly mediated by:
- electrons
- positrons
- gamma rays
- x-rays
- less likely than high
LETlinear energy transfer to produce tissue damage in the same volume of tissue
-<p><strong>Linear energy transfer (LET)</strong> is the average (radiation) energy deposited per unit path length along the track of an <a href="/articles/ionising-radiation">ionising particle</a>. Its units are keV/μm.</p><p>Linear energy transfer describes the energy deposition density of a particular type of radiation, which largely determines the biological consequence of radiation exposure.</p><p>The LET of a <strong>charged </strong>particle<sup>2</sup> is ∞ Q<sup>2</sup>/E<sub>k </sub></p><ul>-<li>LET is proportional to the square of the charge of the particle</li>-<li>LET is inversely proportional to the particle's kinetic energy</li>-</ul><h6>High LET radiations: LET 3-200 keV/μm</h6><ul>- +<p><strong>Linear energy transfer </strong>is the average (radiation) energy deposited per unit path length along the track of an <a href="/articles/ionising-radiation">ionising particle</a>. Its units are keV/μm.</p><p>Linear energy transfer describes the energy deposition density of a particular type of radiation, which largely determines the biological consequence of radiation exposure.</p><p>The linear energy transfer of a charged<strong> </strong>particle<sup>2</sup> is ∞ Q<sup>2</sup>/E<sub>k </sub></p><ul>
- +<li>linear energy transfer is proportional to the square of the charge of the particle</li>
- +<li>linear energy transfer is inversely proportional to the particle's kinetic energy</li>
- +</ul><h6>High linear energy transfer radiations: linear energy transfer 3-200 keV/μm</h6><ul>
-<li>more likely, than low LET, to produce biological damage in a given volume of tissue</li>- +<li>more likely, than low linear energy transfer, to produce biological damage in a given volume of tissue</li>
-<br>Low LET radiations: LET 0.2-3 keV/μm</h6><ul>- +<br>Low linear energy transfer radiations: linear energy transfer 0.2-3 keV/μm</h6><ul>
-<li>less likely than high LET to produce tissue damage in the same volume of tissue</li>- +<li>less likely than high linear energy transfer to produce tissue damage in the same volume of tissue</li>
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