Gravity Geiger Counter Module Ionizing Radiation Detector

DFRobotSKU: RB-Dfr-1206
Manufacturer #: SEN0463

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Sale price $60.00

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Only 2 units left

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  • Gravity Geiger Counter Module Ionizing Radiation Detector
  • Offers large-scale and highly sensitive Geiger tube
  • Detect ionizing radiation
  • Provides a good random number generator
  • Easy to install layout
  • Power Supply: 3.3 ~ 5 V

The Gravity Geiger Counter Module Ionizing Radiation Detector detects ionizing radiation, such as nuclear radiation, X-rays, cosmic rays, etc. Electromagnetic radiation such as microwave oven radiation, mobile phone radiation, WiFi radiation, and induction cooker radiation can not be detected.

In addition, the Geiger counter is a good random number generator, and undetermined high-energy particle ionization events can provide enough random entropy to get you a truly random number, rather than a fixed random sequence based on a random algorithm.

  • 1x Gravity: Geiger Counter Module (Geiger Tube Included)
  • 1x Gravity 3 - Pin Sensor Connector


  • Geiger Counter outline size: 107 x 42 mm / 4.21 x 1.65 inch
  • M4011 Geiger Tube outline size: Φ10 x 88 mm

Geiger Counter

  • Power Supply: 3.3 ~ 5 V
  • Signal Output: digital output, pull down when pulse detected
  • Driving Voltage: ≈400 V
  • Maximum Range: 1200 μSv/h (theoretically)

M4011 Geiger Tube

  • Operating Voltage: 380 ~ 450 V
  • Background Counts: ≈25 CPM
  • CPM Ratio: 153.8 CPM/(μSv/h)

Customer Reviews

Based on 2 reviews

works great! nuff said.

Tube Deteriorated Quickly

I've been running one of these for about three months and the device is starting to have problems. First, about a month ago, the tube became very photosensitive. This was unexpected, since the tube was not photosensitive when it arrived. However, the M4011 is known to be photosensitive, on a tube by tube basis; some are, some aren't.

After rebuilding my enclosure to place the tube in darkness, it worked OK for a few more weeks, but now it is failing to quench properly, resulting in bursts of 2 to 10 pulses within 2 to 5 milliseconds. My guess is this is not unusual for these cheapo tubes. A reminder that this is a toy, not a real instrument. Although it can be used to demonstrate *approximate* background radiation levels, and the inverse square law with a weak radiation source.

To work around this I modified my code to ignore pulses less than 10 ms after the preceding one. This seems to provide reasonable counts again, although the background level is about 25 CPM instead of the 20 it was when the tube was new.

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