Pocket dosimeters are useful in those situations in which large exposures are expected on an infrequent schedule.

 

 
Pocket dosimeters use an extremely sensitive fiber electrometer type voltmeter and a small volume of air to measure the total amount of radiation to which the instrument has been exposed. A reading may be made at any time by merely looking at a source of light through the eyepiece end of the instrument. 

Advantages

  1. Reusable

  2. Easy to read exposure value

  3. Immediate reading of cumulative radiation exposure

Disadvantage

  1. More expensive initially than other devices

  2. More fragile than other devices