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The Boltzmann kinetic equation for rarefied radiating gas is found. It is shown, that process of radiation is defined by excitation of atoms at their collision, and also spontaneous radiation of quantums at transition of electrons to the basic power level and the compelled radiation of quantums at collision of the excited atoms. It is shown, that distributions on velocities of the excited and not excited atoms submit to various laws. Distinctions in laws of distribution of the excited and not excited atoms define power parameters of radiating gas, and also a share of radiating molecules in gas.
of interaction of β-radioactive radiation
with biotissue of an organism is lead. It is shown, that during electrons
moderation there is a brake electromagnetic radiation usually in an X-ray
range. There are derivatives of the formulas in not relativistic and
relativistic variant for a finding of dependence of a flux brake electromagnetic
radiation from frequency, of charging number elements of a biotissue, of a parameter
of efficiency braking of electrons, of initial intensity of a flux of electrons
and initial energy of electrons, is given.
reasons of angular photon distribution occurrence at electron-positron
annihilation are considered. It is shown that angular photon distribution is
consequence of Doppler’s effect in the reference frame of the electron and
positron mass center. In the reference frame bound with moving electron the
angular photon distribution is absent. But it is replaced by the Doppler’s
shift of photons frequencies. The received results are applied to the analysis
of a positron-emission tomograph work.