title: Simple construction of a 16970Yb-16969Tm absorber for peak kilovoltage calibration of a diagnostic x-ray machine.
mesh_terms: D007554:Isotopes; D011859:Radiography / Q000295:instrumentation*; D011868:Radioisotopes; D013932:Thulium; D014965:X-Rays; D015018:Ytterbium
chemical_list: D007554:Isotopes; D011868:Radioisotopes; D013932:Thulium; D015018:Ytterbium