thumb|electronic personal dosimeter (epd, soeks 01m in particular). these give a dose rate, accumulated dose reading and usually have alarm functions. a radiation dosimeter is a device that measures exposure to ionizing radiation. it has two main uses: for human radiation protection and for measurement of dose in industrial processes. ==personal dosimetersphd1== the personal ionising radiation dosimeter is of fundamental importance in the disciplines of radiation dosimetry and radiation health physics and is primarily used to estimate the radiation dose deposited in an individual wearing the device. ionising radiation damage to the human body is cumulative, and is related to the total dose received, for which the si unit is the sievert. workers exposed to radiation, such as radiographers, nuclear power plant workers, doctors using radiotherapy, those in laboratories using radionuclides, and hazmat teams are required to wear dosimeters so a record of occupational exposure can be made. such devices are known as "legal dosimeters" if they have been approved for use in recording personnel dose for regulatory purposes. dosimeters can be worn to obtain a whole body dose and there are also specialist types that can be worn on the fingers or clipped to headgear, to measure the localised body irradiation for specific activities. ===types=== common types of personal dosimeters for ionizing radiation include: ====electronic personal dosimeter (epd)====  the electronic personal dosimeter (epd) is an electronic device, which has a number of sophisticated functions such as continual monitoring which allows alarm warnings at preset levels and live readout of dose accumulated. these are especially useful in high dose areas where residence time of the wearer is limited due to dose constraints. the dosimeter can be reset, usually after taking a reading for record purposes and thereby re-used multiple times. ====film badge dosimeter====  film badge dosimeters are for one-time use only. the level of radiation absorption is indicated by a change to the film emulsion, which is shown when the film is developed. ====quartz fiber dosimeter====  quartz fiber dosimeters are charged to a high voltage. as the gas in the dosimeter chamber becomes ionized by radiation the charge leaks away, causing the fiber indicator to change against a graduated scale. ====thermoluminescent dosimeter (tld)==== {{main|thermolumin
Dosimeters Ionising_radiation_detectors