film badge dosimeter
Quick Summary
A film badge dosimeter is an instrument used to measure exposure to ionizing radiation. It is a small pack containing sensitive photographic film, often wrapped in light-tight paper and housed in plastic. This type of dosimeter is popular due to its affordability and ease of use.12
When exposed to radiation, the film undergoes changes that can be observed after a chemical development process. By comparing the developed film to a reference film exposed to a known radiation dose, the cumulative amount of radiation the wearer has been exposed to can be determined. To improve accuracy, especially with low-energy radiation, the film may be wrapped in metallic foil, and filters of varying thickness can be incorporated to extend the measurable range of exposure and differentiate between types of radiation.31
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