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Dosimeters are a form of devices to monitor ionizing radiation. They are used regularly for a number of key roles including both patient and personal dosimetry, environmental monitoring, spectroscopy, radiopharmaceutical and equipment checking.
Energy enters the dosimeter which converts this energy into a signal strength and an output. The conversion process and the output are unique to each different type of dosimeter.
Common output modalities are:
dose rate: gives an instantaneous value over time
often used in environmental, radiopharmaceutical and equipment checks
total dose: the amount of activity over a given time frame
patient or personal dosimetry
Types of dosimeters
charge collection devices: radiation energy is converted to electric charge (either directly or indirectly) and the dosimeter converts this charge into a signal output
other type: devices made of material that changes on exposure to radiation energy