Abstract: A single test phantom for evaluating the scan of a nuclear imaging device is provided which comprises a container having a sealed cavity therein, the outer walls simulating the outline of a human organ or a portion of the body which can be scanned. A means to allow injection of a suitable radioisotope into the cavity is provided, as are a plurality of radioisotope-collecting areas of various sizes and depths which simulate the various conditions that would be seen in a typical scan. By comparing the scan of the test phantom to the test phantom itself, the physician via the single scan can determine whether the nuclear imaging device being tested is properly calibrated and is in satisfactory operating order in an environment simulating an actual scan of a patient.