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We present a transport equation for the incoherent propagation of radiationinside a quasi-resonant atomic gas at low temperature. The derivation is basedon a generalized Bethe-Salpeter equation taking into account the motion of theatoms. The obtained equation is similar to the radiative transfer equation. Itis solved numerically by an original Monte Carlo approach in the case of a slabgeometry. The partial frequency redistribution caused by the small velocity ofthe scatterers make the emitted flux outside the system and the energy densityinside the medium to behave differently than in the case of complete frequencyredistribution. In particular, the long time dependence of the specificintensity (escape factor) is slightly different from the Holstein prediction.

Enhancement of radiation trapping for quasi-resonant scatterers at low temperature