For monitoring individual persons we use plastic films which discolour to UVR. This change, measured spectrophotometrically, is proportional to exposure. Polysulphone film has been found to have chief biological application as its spectral reactivity matches normal sunburn. PVC films incorporating various photosensitive chemicals have also been under study. Polysulphone, as a personnel dosimeter, has been used to study hospital-bound geriatric patients, office workers, laboratory workers and gardeners. People indoors were exposed to about 5% of ambient during the working week, but at weekends 50% of weekly dose could be attained during outdoor leisure activities. But bedridden geriatric patients received negligible UVR. Film badges have also been used to study anatomical distribution of solar UVR over the body, and the distribution in patients undergoing phototherapy. Film has been employed to study psychiatric patients on tranquilliser drugs where photosensitivity is an adverse side effect. Film badge dosimetry for UVR remains unexploited in industry; here its simplicity and cheapness would seem outstanding features.