SARI, G.; WAHYUNI, G. Efficiency Test Of Colimator Shutter At The X Ray Tube In Radiodiagnostic Laboratory Of Poltekkes Jakarta 2 And Two Clinical Hospitals In Jakarta. SANITAS: Jurnal Teknologi dan Seni Kesehatan, v. 8, n. 1, p. 16-20, 1 jun. 2017.