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Enviromental measuring systems
 
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Praskač - pocket detector radioactive radiation - GMM78

"Praskač" (Scratch) is a pocket detector of ionizing radiation. We use it to quickly detect radioactivity in the environment.
 
• Portable instrument
• Battery powered
• Short response time
• Built-in speaker
• Light weight: 0.23 kg
• 100 hours of continuous operation with 9 V battery
  • General
  • Technical data
  • Documents
  • Video
  • Images
A thin-walled cylindrical Geiger Mueller tube is built into the instrument; each current pulse triggered by a photon through it amplified causes an acoustic signal. At normal background activity (approx. 100 nSv/h) we hear about 10 bursts per second. Up to a dose rate of approx. 10 µSv/h we hear crackling, which turns into buzzing at higher dose rates. At even higher dose rates, the sound slowly dies down.
Replacable 9 V battery can power the instrument continuously for 100 hours. As the sound becomes weaker, the used battery can be replaced.

Dimensions

135 mm x 60 mm x 30 mm (L x W x H)

Mass

230 g

Power suppply

replacable battery 9V

Detector

cylindrical thin-walled GMpipe SBM20

High voltage

400V

Background

approx. 10 imp/min (100 nSv/h)

Cracking

Up to approx. 1 µSv/h

Scratching

approx. 1 µSv/h to 10 µSv/h

Buzzing

above 10 µSv/h

Upper use limit

approx. 1 Sv/h

 

TitleDescriptionFilename
Datasheet GMM78  GMM78_EN.pdf 

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Praskač - pocket detector radioactive radiation - GMM78
Pocket detector radioactive radiation - GMM78
 
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