Co-57 flood sources are intended to produce uniform radiation fıeld across the camera’s usable field of view with the method’s of NEMA NU-1-2007 to evaluate the gamma camera uniformity.
ERS rod sources and Pen Point Markers are calibrated by direct comparison of standardized solutions traceable to the National lnstitute of Standards and Technology (NIST), in an identical geometry, using a pressurized ion chamber with ±5% accuracy.
ERS spot markers are used for a range of purposes including patient orientation during a camera study, gamma camera calibration and quality control, gamma probe and Nal detectors calibration and performance check.