Conversation so far:
what type of radiation is light with a wavelength of 1nm
A light with a wavelength of 1 nm is an ultraviolet radiation.
what is untraviolet radiation used for
UV radiation is widely used in industrial processes and in medical and dental practices for a variety of purposes, such as killing bacteria, creating fluorescent effects among other things
what are some sources of uv radiation
Sunlight is the greatest source of UV radiation. Man made ultraviolet sources include several types of UV lamps, arc welding, and mercury vapour lamps.

Question: can the radiation be therapeutic
Self-contained rewrite: can uv radiation be therapeutic