[en] Radiofrequency (RF) dielectric sealers and heaters are used to weld, glue or heat plastic or wood materials. During the process the operators can be exposed to high levels of RF-radiation. In the report measurements of the electric and magnetic field strengths in the operator position in 20 facilities are presented. The results are discussed in relation to a radiation protection standard which is under work in Norway. A significant number of devices exposed their operators to fields having an equivalent power density greater than 250 W/M₂ averaged over one second and 10 W/m₂ averaged over one hour. Some means for reducing exposure to the operators are presented. (Auth./RF)