title: Use of a copper filter for dose-calibrator measurements of nuclides emitting K x-rays.
mesh_terms: D002138:Calibration; D003300:Copper; D005374:Filtration / Q000295:instrumentation; D011874:Radiometry / Q000295:instrumentation; D011877:Radionuclide Imaging / Q000295:instrumentation*
chemical_list: D003300:Copper