Ultraviolet radiation dosimetry with radiochromic film

Radiochromic film is tested for its broad-band response to ultraviolet (UV) B (290-320 nm) and A (320 nm-400 nm), visible and infrared radiation produ ced by a solar simulator and examined for dosimetry in ultraviolet radiatio n. Results show that MD-55-2 radiochromic film in solar and fluorescent lig ht sources responds almost exclusively to broad-band UVA radiation with neg ligible colouration from UVB, visible and low level infrared radiation. A s econd order polynomial function approximates the change in optical density at 660 nm wavelength for film colouration with exposure to UVA from white l ight fluorescent and solar UV with exposures measured with a dedicated UVA dosimeter. Using a double exposure technique as used in radiation dosimetry where the film is firstly irradiated to a known UV dose, radiochromic film can be used as a quantitative measure of UVA exposure.