ForewordNuclear medicine practitioners use solid@ uniformly radioactive sources that are several millimeters thick with areas up to 0.25 m 2 (called ??flood?? sources) to characterize and correct the extrinsic flood field uniformity of scintillation cameras for purposes of both quality assurance and on-line operational corrections. These radioactive sources are intended to produce a uniform radiation field across the camera??s usable field of view. Methods to evaluate camera uniformity are described in NEMA NU 1-1994. 1 A broad range of flood sources is available in many sizes and configurations from a number of manufacturers. Such diversity suggests the need for a uniform means of reporting calibration data and a common understanding of the parameters reported. This information can permit intercomparison of sources and give practitioners a means to determine whether a particular source is appropriate for a given task.ScopeThe scope of this standard is limited to commercially-produced@ solid radioactive flood sources intended to aid in the determination of the system field uniformity of scintillation cameras used in nuclear medicine. This standard is intended to provide a set of minimum informational requirements for a Test and Measurement Report for flood sources used with scintillation cameras. It is not intended to specify the means by which such information is obtained@ although it does place requirements and limitations on the methodology. In addition@ it is not intended to cover the use of the source in the determination of the operating characteristics or correction factors for a scintillation camera.