I would have continuous monitoring of radiation level outdoors.There is such item which allows connection of a tube:http://www.ebay.com/itm/Arduino-IDE-compatible-Geiger-counter-dosimeter-circuit-w-LCD-shield-/181038202229?pt=BI_Security_Fire_Protection&hash=item2a26b7bd75But I think there is sufficient overhead it complexity and cost. If we connect to Arduino the scheme can be much simpler:there will be enough DC-DC up-step voltage converter to supply tube, one indicating led and the tube discharge current detector. I asked one of ebay's seller if the chinese folks can make and sell more simple and low cost shield than above one.He ask me how many items do I need? I need one item but think I am not the only who need one. So I decided to ask others.