The photographic plate technique, using boron and lithium-loaded emulsions, has been applied to provide a slow neutron personnel monitoring service. The method is simple and economical in operation, and is sufficiently sensitive to reduce the necessary microscope work to insignificant proportions. Fast neutron personnel monitoring can be carried out quantitatively by employing the proton recoil tracks appearing in the same plates if the source is monochromatic in energy. Where fast neutrons of widely differing energies are present simultaneously it is usually a lengthy process to obtain an accurate dose determination.