A dedicated device, a dish, used for the manual production of beam blocks which serve to configure a radiation field. This device is used in the production of radiotherapy blocks to cool down the melted metal, e.g., Rose's metal [consisting of lead (Pb), tin (Sn) and bismuth] when this has been poured into the moulds. It may also have the function of vibrating the metal during the cooling process to ensure equal distribution of the metal throughout the mould.