Gravity: Geiger Counter Module Ionizing Radiation Detector

This Gravity Geiger Counter Module detects ionising radiation — including nuclear radiation, X-rays, and cosmic rays — using a large M4011 Geiger-Müller tube. When ionising particles pass through the tube, the module outputs a digital pulse that can be counted by any microcontroller to calculate radiation intensity in CPM or µSv/h.

The Gravity interface connects directly to Arduino, Raspberry Pi, and other 3.3–5 V boards via a single digital pin. Beyond radiation detection, the random nature of ionising events also makes this module a true hardware random number generator.

Key Features

• M4011 Geiger Tube – Large, highly sensitive detection tube
• Digital Pulse Output – Pull-down signal on each ionisation event
• Gravity Interface – Simple 3-pin digital connection
• 3.3–5 V Compatible – Works with Arduino, Raspberry Pi, and more
• True Random Number Generator – Undetermined ionisation events provide genuine random entropy

Specifications

Geiger Counter Module:

• Supply Voltage: 3.3–5 V
• Output: Digital (pull-down pulse on detection)
• Driving Voltage: ~400 V (generated internally)
• Maximum Range: 1,200 µSv/h (theoretical)
• Module Size: 107 × 42 mm

M4011 Geiger Tube:

• Operating Voltage: 380–450 V
• Background Counts: ~25 CPM
• CPM Ratio: 153.8 CPM per µSv/h
• Tube Size: Ø10 × 88 mm

Package Contents

• 1× Gravity Geiger Counter Module (M4011 tube included)
• 1× Gravity 3-pin sensor cable

Resources

• Product Wiki