title: X-rays: 2 MV (constant potential) generators.
mesh_terms: D000388:Air; D003300:Copper; D004560:Electricity; D006801:Humans; D007854:Lead; D008954:Models, Biological; D011879:Radiotherapy Dosage / Q000592:standards*; D011882:Radiotherapy, High-Energy / Q000592:standards*; D012542:Scattering, Radiation
chemical_list: D007854:Lead; D003300:Copper