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Here is a video testing it using a small amount of radioactive Americium found in a smoke detector:
Step 1: How It Works
Step 2: Finding a Radio
As you can see, there are little valleys when I create sparks. This means that the radio is detecting the disturbances properly. The radios I used were a $1 mini radio and a larger more sensitive radio I salvaged from my grandfather.
Step 3: Making a High Voltage DC Power Supply
Be careful! The output from this unit will be around 400-600v! Test it out by touching two AA batteries to the + and - spots that were taken out, and the red LED should be on (or whatever other light is there).
Step 4: Spark Gap Quenching
Once you do this correctly, there should be arcs every so often, but not continuously (maybe once every couple of minutes). This means that the unit is detecting ionizing radiation! To hear the "clicks," turn on the radio.
I have attached a picture in which I have produced a spark gap between an alligator clip and a screwdriver, but any type of gap would work (between a wire and a plate, between two plates, between two wires, etc.).
Here are some videos of proper operation (notice and listen carefully for the audible "clicks"):
Step 5: Boxing It Up
I added a switch and added an LED popping out from the box to replace the LED in the camera HV DC board. After gutting the mini radio, everything fits in a little altoids tin (perfect for pocketing).
The wires may need to periodically be re-calibrated, and the unit needs to be held still for it to work (vibration can cause an arc). Don't blow on the spark gap!
I hope you enjoyed this instructable! Rate, comment, and vote!