In this instructable I will teach you how to build an ionization chamber, which should not cost more than $ 10. Sorry for my bad english, I'm Brazilian, so do not speak very well.
Can of coca cola or other
voltmeter or multimeter
9 volt battery
1 can opener
connector 9 volt battery
Make a hole in the bottom of the aluminum can, and then use the can opener to remove her top.
Connect the electronics components of the way I explain in this scheme.
use aluminum foil to cover the open side of the can.
Connect the multimeter in DC voltage meter and place the radioactive material in front of pael aluminum. It only detects large amounts of ionizing radiation (not measure the radiation serves pair of your hand).
To test it use americium from smoke detctores, blankets lamp, luminescent hands containing radium.
if there is intense radiation it only shows the battery voltage, but if there is a source of much radiation it shows much higher voltages than the battery.
You can use it to alert you of a nearby nuclear attack or radioactive contamination.
If you want to also use one of those other projects that are more accurate, but more complex.
akgabe101 made it!