A dosimeter is a device that is used to measure the amount of radiation to which a radiographic personnel is exposed. Thermoluminescent dosimeters work on the principle of luminescence, by absorbing a amount of ionising radiation to which it is exposed and later emitting the absorbed radiation in the form of light which is displayed on the machine in the form of a glow curve when the dosimeter is read. It is a method of personal radiation monitoring which should be followed by all individuals working in radiation fields, as it also provides an assessment of the usefulness of radiation protection measures being followed.