radiation generator
Technical term used in physics, medicine, and industrial contexts for equipment that produces ionizing radiation.
A radiation generator is installed in the hospital.
This research institute is developing a new radiation generator.
放射線 is radiation itself, while 放射線発生装置 is the device that produces it.
発生装置 is a general term for a generator or generating device; 放射線発生装置 specifies radiation generation.
Compound of 放射線 (radiation) + 発生 (generation) + 装置 (device). A straightforward technical term with no historical ambiguity.