Working Geiger Counter W/ Minimal Parts : 4 Steps (with Pictures) - Instructables

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Mini Digital Geiger Counter : 6 Steps (with Pictures) - Instructables

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Homemade Geiger Counter - Instructables

New and Improved Geiger Counter - Now With WiFi!

Arduino DIY Geiger Counter : 12 Steps (with Pictures) - Instructables

Simplest Geiger Counter : 7 Steps (with Pictures) - Instructables