Killing coronavirus with handheld ultraviolet light device may be feasible.
The UV radiation is in the 200 to 300 nanometer range and known to destroy the virus.
by Walt Mills
The UV radiation source is typically an expensive mercury-containing gas discharge lamp, which requires high power, has a relatively short lifetime, and is bulky.
The solution is to develop high-performance, UV light emitting diodes.
https://phys.org/news/2020-06-coronavirus-handheld-ultraviolet-device-feasible.html
(Paper)
