The interaction between turbulence and radiation (turbulence-radiation interaction: TRI) is an important issue in chemically reacting turbulent flows. TRI arises from highly nonlinear coupling between fluctuations in temperature and species composition with the fluctuations of radiative intensity. Here direct numerical simulation has been employed to investigate TRI in a canonical turbulent premixed system in two-dimensional geometry. A quasi-stationary flame is obtained by feeding in turbulence from an inlet with a constant mean flow velocity to stabilize the fuel consumption rate. A photon Monte Carlo method has been used to solve the radiative transfer equation. For the optically thick case studied here, radiation strongly affects the local and global turbulent flame structure. Individual contributions of emission and absorption TRI have been isolated and quantified. The temperature self-correlation, the absorption coefficient-Planck function correlation, and the absorption coefficient-intensity correlation have been examined for large value of the optical thickness, and contributions from all three correlations have been found to be significant.