UV light penetration is a key factor in liquid food irradiation
processes carried out to inactivate microorganisms. The inactivation
effects of UV on microorganisms in liquid foods not only
depend on the applied fluence but also on the transmittance, composition
and presence of suspended solids in the product to be
treated. Therefore in this work, it is also important
to measure the penetration depth, or the transmittance of
light, through the cell walls and samples under study.