The photodiode is actually sensitive enough to detect the small amounts of gamma radiation produced from a smoke alarm americium source, and also registers [Alan]’s other more powerful ...

For the existing photoelectric smoke detector, an infrared light source and a light-sensing photodiode are placed in opposite directions inside the detector. When particles, such as smoke ...

A G-M tube is not the only game in town though, and even the humble photodiode can be pressed into service. [Robert] gives us a good example, with a self-contained radiation detector head that ...

For the existing photoelectric smoke detector, an infrared light source and a light-sensing photodiode are placed in opposite directions inside the detector. When particles, such as smoke ...