A device for determining control parameters for a particle irradiation system that deposits different dose values at different target points in a target volume through the selection of sampling points by a particle beam is provided. The device includes an input for receiving information relating to a predefined dose distribution via target points, and a determination component for determining a particle number distribution that is to be deposited during the irradiation via sampling points. The determining takes place using the predefined dose distribution and a variable, which takes into account differences in the particle number distribution between particle numbers of different sampling points.
