Dosimeters- Pocket Ionization (Ion) Chamber
sometimes called a Direct Reading Dosimeter (DRD) or Quartz Fiber Dosimeter (QFD) contains a charged quartz fiber that can be viewed thru a built-in microscope.
radiation passing thru the chamber on the device causes a discharge and a deflection of the fiber. With these DRD or QFDs you can instantly determine the amount of radiation exposure.
advantage of instant readings but are very fragile and require frequent collaboration and leakage checks to make sure the readings are accurate.