The controlled exhaust of heat and particles from the core plasma is one of the most challenging problems for a fusion reactor because an uncontrolled flow would damage the main vessel wall. A much investigated possible solution is to direct a large part of the heat and particle flux to a so-called divertor plasma, where the power is transferred to specifically designed tiles (the divertor can also take care of helium "ash" removal and limit the impurity influx to the core plasma). Still the power load would be too high unless a large fraction of the power entering the divertor is lost via radiation. Experiments with a "radiative divertor" in the JET tokamak will be presented. Experimental observations of the radiation and significant neutral-particle losses derived from bolometer tomography are compared with code simulations. Techniques to improve the spatial resolution of the bolometer tomographic reconstructions will also be be discussed.