A calculator to estimate radiation dose from PET radionuclides. The user can vary, the nuclide, the radioactivity (MBq), the form of the radioactive source (point source, vial, syringe), the distance from the source and the amount of shielding between the dose measurement and the source. Dose estimates are given in Sv, mSv and microSv. The skin dose is also provided in the paticular use case that all radioactivity is contained in 10ml, and 0.5ml of this contaminated the skins surface.