Gravity: Geiger Counter Module Ionizing Radiation Detector Wiki - DFRobot
Arduino-based Radiation detector
Pocket Geiger Radiation Sensor - Type 5 (SEN-14209)
DIY Irradiation Meter with Arduino – A blog about DIY solar and arduino projects
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REES52 Assembled DIY Geiger Counter Kit Module Miller Tube GM Tube Nuclear Radiation Detector Geekcreit for Arduino - products that work with official Arduino boards : Amazon.in: Industrial & Scientific
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Geiger Counter - Radiation Sensor Board for Arduino