北京产F39-I型接触治疗X线机的最高管电压为50kV，电流为2mA。它能产生大量的软射线专供治疗表层肿瘤，诸如牙龈癌、口唇癌、乳头瘤、瘢痕瘤、血管瘤以及神经性皮炎等。该机高压发生器、风冷装置、管头与控制台装在一起，结构紧凑，轻便灵活，仟伏毫安连续可调、射线窗回在管头 The maximum tube voltage of Beijing F39-I contact treatment X-ray machine is 50kV and the current is 2mA. It can produce a large number of soft rays dedicated to the treatment of superficial tumors, such as gingival cancer, lip cancer, papilloma, keloid, hemangiomas, and neurodermatitis. The high pressure generator, air-cooling device and pipe head of the machine are assembled with the console, and the structure is compact, light and flexible, the hacking milliamperes are continuously adjustable, and the ray window is back at the pipe head.