Types
Common types of wearable dosimeters for ionizing radiation include:
- Quartz fiber dosimeter
- Film badge dosimeter
- Thermoluminescent dosimeter
- Solid state (MOSFET or silicon diode) dosimeter
The quartz fiber dosimeters have to be prepared, usually daily, with a positive charge from either a hand-wound or battery-powered charging unit. As the gas in the dosimeter chamber becomes ionized by nuclear radiation the charge leaks away causing, the fiber indicator to rise up the graduated scale.
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. Both the quartz and film badge type are being superseded by the TLD and electronic semiconductor type, which can have a number of sophisticated functions such as alarming at preset levels and live readout of dose accumulated.
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