Respon detektor radiodiagnostik terhadap perubahan kualitas radiasi pesawat sinar-x pada rentang rqa berdasarkan technical report series no. 457 = Radiodiagnostic detector response of changing radiation quality of x-ray machine at rqa range based on technical report series no. 457 (Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2010)