Researchers have developed a low-cost, portable radiation dosimetry system that turns a smartphone into an on-site radiation detector. The system combines a small piece of radiochromic film with a foldable, battery-powered scanner and a smartphone camera. At the core of the system is Gafchromic EBT4 film, which changes color instantly when exposed to radiation. The color shift is visible to the naked eye, but the system goes further by allowing users to quantify radiation doses by scanning the film and capturing its image with a smartphone. Mobile image-processing applications are then used to analyse the change.

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