PET AccessoriesOrder NumberType of SourceActivityQtyRecommended Replacement cyclePhantom ShieldShield-20Shield for PET-20C19N/A1N/APhantom Shield Features Phantom Shields are designed to store any standard 20cm PET cylinder phantoms regardless of manufacturer. Steel-jacketed lead is used on the top cover and the sides to attenuate the 511 keV gamma radiation. Sanders Medical Phantom Shields are supplied with four caster wheels for easy movement. Total weight = 144 kg/316 lbs. Deliveries Four weeks after receipt of order. Expedited deliveries are available upon request. Ge-68 Nuclide: 270.8 day half-life 511 keV photon energies