Nuclear Geiger Counter GammaGuard CT008-F Radiation Detector



Custom made specifically for detection of post-nuclear detonation incidents 

The CT008-F is a compact alpha, beta, gamma detector. This makes it suitable for identifying radioactive contamination. The CT008-F is sensitive enough to pick up the radiation from household items, but can still measure up to dangerous levels. Unlike pancake Geiger-Mueller tube based instruments, it is light, compact, and durable. It uses solid state technology which offers the ability to withstand air pressure changes without rupturing. It is easy to use and can even connect wirelessly to your phone. The phone provides a rich user interface and allows for time and date stamped data logging with GPS coordinates. The data can be logged to a file on your phone.

On the back is the sensor with an alpha shield. This shield can be closed to take gamma only measurements, or opened to reveal the sensor window and take alpha and beta readings. This shield also keeps the sensor safe during transport.

CT008-F runs on 2 standard AAA batteries.

A smart phone is NOT required to use the CT008-F, but does offer some enhancements for functioning. 


  • Alpha, beta, gamma detector
  • Low cost, compact, lightweight
  • Response range from 0 to 10 Sv/h
  • Simple single-button local operation with display 
  • Connects to GammaGuard via Bluetooth Low Energy (BLE)
  • State of the art solid state detector 
  • Rich user interface provided by smartphone display
  • Capable of logging data to the smartphone, or to RadResponder


  • Indicated Use: Contamination frisking, sample counting and surveying
  • Detector: Plastic scintillator and silicon photomultiplier 
  • Measurement Units: User selectable (μSv,, mRem, or counts)
  • Window: 4.2 cm2 active area alpha, 5 cm2 beta/gamma, aluminized mylar protected by stainless steel screen
  • Sensitivity: approx. 260 CPM/ uSv/h (Cs-137)
  • Range: 0 to 10 Sv/h, 1000 Rad/h
  • Resolving Time: 15 microseconds 
  • Response Time: User selectable from 1 to 30s or Auto. Display updates every second
  • Background: Aprox. 12 CPM
  • Local Display: 2.2 x 1.2 cm OLED. Font size automatically adjusts to display as many digits as needed
  • Local Controls: One push button - short press (<2s) to toggle screens; long press (
    >2s) to enter/exit Sleep mode
  • Wireless Communication: Bluetooth Low Energy connecting to GammaGuard
  • Batteries: 2 standard AAA batteries
  • Operating time: 300 hours connected to GammaGuard, 130 hours if using local display
  • Size: 5 x 9 x 2.4 cm (2 x 3.5 x 0.9 in.)
  • Weight: 80 g (including batteries)

Customer Reviews

Based on 2 reviews Write a review

Customer Reviews

Based on 2 reviews
Works like a champ.

I'm impressed with it's small size. Seems to have lots of features. It's even better when you use it with the free downloaded software for the android. I may never need to use it, but I feel better that I have it. It even includes small radioactive samples to give you confidence it is working. Nate did a great review on YouTube about this detector.

Excellent radiation meter

Great meter for all around use. Well built and seems accurate compared alongside my other meters. Excellent customer service and fast shipping! Thanks to Nate and the team!