Geiger Counter

April this year was the twentieth anniversary of the Chernobyl reactor accident. In the days following the incident winds deposited much of the reactor contents across central Europe, Scandinavia and the UK. A large area surrounding the reactor is still off limits but just how much of the fallout is still lying around on our gardens and farmlands?

In the circuit diagram, the junction of C5 and the 220-V winding of TR1 should be connected to the circuit ground line.