Does your biological safety cabinet (BSC) have an ultraviolet (UV) lamp in it? If so, it may not be as effective for sterilization/decontamination purposes as you need it to be.
Ultraviolet radiation is a form of non-ionizing radiation, and biological effects from it vary with wavelength, photon energy, and duration of exposure. The 100-280 nm wavelength band is designated as UV-C, which is used for germicidal purposes.
The sterilization/decontamination activity of UV lights is limited by a number of factors, including: