In one embodiment, a device for generating broad spectrum ultraviolet radiation is provided. The device includes an adjustable spark gap of metallic solids, the spark gap including: a first electrode coupled to a first heatsink, and a second electrode coupled to a second heatsink, the second electrode spaced apart and opposite from the first electrode. The device includes a variable capacitor configured to discharge a voltage through the spark gap to generate broad spectrum ultraviolet radiation. The device includes a voltage source. The device includes a controller configured to control the variable capacitor. The first electrode is formed from a first metallic solid and the second electrode is formed from a second metallic solid, and the ultraviolet radiation generated is in the 140 nm to 400 nm range.