Gamma CamerasSodium IodideRadionuclide ImagingIodidesPhotonsTomography, Emission-Computed, Single-PhotonIodine RadioisotopesPerchloratesThyroid GlandSodiumPhotographyPotassium IodideScintillation CountingIodineSodium Pertechnetate Tc 99mThyrotropinThyroid NeoplasmsVideo RecordingIodide PeroxidaseAir Pollution, Radioactive