From Big Medical Encyclopedia

LINEAR POWER TRANSMISSION (LPT) — the mean energy absorbed by the environment in the place of passing of charged particle, referred to unit of its way.

As unit of LPE the kilo-electron-volt on a micrometer of water, 1 kev/micron = — 1,6*10 is used - 10 The J/m

of LPE depends on a type of charged particles and on their energy. For each type of particles there is a nek-swarm a LPE maximum value. So, e.g., for protons with energy apprx. 70 kev the LPE maximum value makes 100 kev/micron; for alpha particles the LPE maximum value equal 220 kev/micron, is reached at energy 750 kev; for kernels of carbon, nitrogen and oxygen LPE value reaches 600 — 1000 kev/micron at energy of particles — 10 MEV.

Use of LPE for the characteristic of quality ionizing radiation (see) played a big role in development of radiobiology, medical radiology, dosimetry of ionizing radiation and microdosimetry. LPE serves as a quantitative measure of density of ionization of the environment as charged particles (see. Ionization ) also allows to consider distinction in biol, effects for different types of ionizing radiation at an identical absorbed dose. For more total characteristic of the dozny field along with an absorbed dose it is necessary to establish LPE value, a cut allows to define by use of coefficient of quality (the dimensionless number depending on LPE of charged particles in water) dependence biol, effect of LPE of radiation. Dependence of coefficient of quality on LPE is given in the table.

For assessment of radiation hazard, multiplying value of an absorbed dose by average coefficient of quality of radiation in this point biol, an object, find an equivalent dose of radiation, to-ruyu then compare with marginal doses of radiation (see), the established accepted standards of radiation safety for the corresponding category of the irradiated persons.

Table. Dependence of coefficient of quality on linear power transmission

V. V. Yurgov.