TY - RPRT TI - Calibration of gamma-ray-emitting brachytherapy sources AU - Weaver, James T AU - Loftus, Thomas P AU - Loevinger, Robert PY - 1988 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS SP 250-19 DO - 10.6028/NBS.SP.250-19 ER -