system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why is radiation visible on cameras? like a radioactive object would have loads of white dots around it?
gpt
Cameras operate either by having pixels on something like a CCD, or grains of light-sensitive chemicals embedded in a film. In both situations the actual radiation, charged particles or high energy rays, interact with small areas of the film or pixels of the CCD. The radiation triggers them as if a large amount of light struck them, producing white spots on that one frame. As many frames of a video affected by radiation are played these spots are visible as very brief speckles.