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24 kwi 2022 · Linear energy transfer describes the energy deposition density of a particular type of radiation, which largely determines the biological consequence of radiation exposure. The linear energy transfer of a charged particle 2 is ∞ Q 2 /E k.
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3 sie 2018 · Definition of X-rays. X-rays belong to the group of electromagnetic rays, hence, they follow the rules of electromagnetic radiation. Electromagnetic radiation transports energy, also called radiant energy, through space by waves and photons, just as radio waves, the visible light or microwaves.
Linear energy transfer is best defined for monoenergetic ions, i.e. protons, alpha particles, and the heavier nuclei called HZE ions found in cosmic rays or produced by particle accelerators. These particles cause frequent direct ionizations within a narrow diameter around a relatively straight track, thus approximating continuous deceleration.
Part of the energy of the photon is transferred to the scattering electron, thereby ionizing the atom and increasing the wavelength of the X-ray. The scattered photon can go in any direction, but a direction similar to the original direction is more likely, especially for high-energy X-rays.
Energy released in a given distance is called Linear Energy Transfer (LET) that measures change of energy per change in distance. Different types of radiation have different LET. Radiation types with high LET deposit more energy locally, i.e. over a very short distance.
What is Linear Energy Transfer? Linear Energy Transfer (LET) represents a fundamental principle in the fields of radiobiology, radiation physics, and medical physics. It pertains to the rate at which energy is deposited by ionising radiation as it travels through matter, including biological tissue.
Low-linear energy transfer (LET) radiation (i.e., γ- and X-rays) induces DNA double-strand breaks (DSBs) that are rapidly repaired (rejoined). In contrast, DNA damage induced by the dense ionizing track of high-atomic number and energy (HZE) particles is slowly repaired or is irreparable.
