Abstract: The invention relates to a device for measuring the dose delivered through a radiosensitive film under exposure to ionizing radiations, to a system comprising such device and to the use of such device. More particularly, the device comprises a reflection film; at least one light source; a radiosensitive film; and an optical sensor system comprising a 2-D array of one or more photoresistor units and/or semiconductor units. The present invention also relates to a system comprising the device previously described; a readout integrated circuit unit connected to the optical sensor system of the device; and a processing unit connected to the readout integrated circuit. The present invention also relates to the use of a device as previously described.