UploadedSubmitted by: charleswenzel Project Website: https://www.techlib.com/science/picaxeionchamber.htm
Ionization Chamber Radiation Detector
This radiation detector uses an ordinary coffee can to detect low levels of radiation, much like a Geiger counter, but without the clicking.
The PicAXE08M determines the level of radiation by detecting extremely low currents with the aid of a common electrometer JFET, used in an unorthodox manner that eliminates the need for special and expensive high-value resistors.
My prototype can readily see changes in chamber current as low as 10 fA on the most sensitive scale. As a point of reference an ordinary radioactive lantern mantle can peg the second scale.