The shielded transportation cart ATW3 is used for easy transportation and radiation-protected storage of up to two flood phantoms of the FP flood phantom series. Phantoms up to the size of the FP67S flood phantom can be stored after use. This keeps the filling in the flood phantoms and the radioactive test isotope can decay over time. The emptying and refilling of the flood phantoms are avoided. The interior space of the cart is divided into two compartments by a dividing wall, ensuring that the flood phantoms cannot damage each other in case of double load.