Advantages
The film badge has several advantages over other types of dosimetry:
- Permanent record of exposure: The developed film is physical evidence of the radiation exposure. The film can be stored after developing and reading, and could be reviewed at a later date if there is a query over exposure.
- Exposure pattern discrimination: A film badge offers limited discrimination between different patterns of exposure. A single exposure tends to leave sharp shadows on the film from the filters, whereas multiple small exposures at different angles will leave a rim of blurring around the filters. This may allow the linking of a dose with a specific incident and provides a degree of protection against tampering (e.g. deliberate exposure to a radiation source).
- Radiation type detection: Use of multiple filters allows separate measurement of beta and gamma exposure, and estimation of energy spectra. Additional filters can be added to detect neutron radiation (e.g. cadmium). The sensitivity of film to low energy (< 20 keV) gamma or x-radiation can be better than electronic dosimeters.
Read more about this topic: Film Badge Dosimeter
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