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Pocket Geiger Counter - Type 5

SparkX sold out! But we now have this available through SparkFun over here.

The PocketGeiger-Type5 from Radiation Watch is a highly sensitive radiation sensor designed for the embedded systems market. Capable of detecting Gamma and Beta radiation, it has a simple pulsed output that can be used with any microcontroller. The Pocket Geiger has an onboard DC boost circuit, so the board can be supplied with a friendly 3V to 9V. Using only 30mW (10mA @ 3V), it is very low power. Radiation Watch has a handful of documents and example Arduino code to get you up and running. They have also written a Windows example program written in C# (source included!) to output graphs to a computer using an Arduino as the reader. Additionally, the counter comes with an optional enclosure and 3.5mm cable that allow you to connect the counter to some mobile phones (may not be compatible with phones sold in the EU).

We do not plan to regularly carry SparkX products so get them while they're hot!

Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum for support or to ask a question.


Measurement Range:

  • 0.05uSv/h~10mSv/h (Cs-137)
  • 0.01cpm~300Kcpm

Required Measurement Time: 2min

Product Includes:

  • Type5 Geiger counter board with copper EM shielding
  • Brass plates (attach to block beta particles)
  • 9V battery holder with On/Off switch
  • 16” TRRS cable
  • Plastic enclosure
  • Extra 3.5mm TRRS jack

Weight: 7g (board only)

  • 58 x 26 x 11mm

Pocket Geiger Counter - Type 5 Product Help and Resources


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Those sensors are like $60 a piece for a batch of 100! How can you sell these for so cheap?!?!

  • I built a fully functional geiger counter and logger around this. You can check it out on Hackaday.io: https://hackaday.io/project/20299-geiger-zero

  • Does anyone know the maximum voltage present on this board?

    Curious if it also does a large diode cap step- up to 500ish Vdc like the Sen-111345 part.

    • If you look at the manufacturer's website it says there's 40V bias on the diode

    • This product uses a large photodiode for the detector, not a Geiger-Mueller tube, so this board does not require a high-voltage supply to operate like SEN-11345 does.

    • It's solid state, so like 3-9v maybe?

    • I believe there is a typo in the provided schematic.

      U4 should be LT1615 as opposed to 1651 as noted.

      If this is correct. the data sheet for the part is: http://cds.linear.com/docs/en/datasheet/16151fas.pdf

Customer Reviews

4 out of 5

Based on 1 ratings:

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I was able to get this up and running with the included Arduino sketch within minutes.

It does take a about 2 and half minutes to start reporting even the baseline radioactivity.

I love the trefoil that comes on the box. Having a case to go with it is very convenient. Overall it's one of my cooler sensor purchases.

Planning on generating some random numbers with this entropy.