Pocket radiation detector GMM 78 (Cracker)
For quick indication of ionising radiation.
GMM 78 (cracker) is pocket detector for ionising radiation. It is used for quick indication of radioactivity. As a detector, cylindrical thin-wall Geiger Mueller tube is used. Each pulse caused by a passing photon is heard as crunching coming from the built-in loudspeaker. At the background radiation (aprox. 100 nSv/h), about 10 cracks per minute are heard. To the dose rate of aprox. 10 µSv/h, cracking sound is heard, which, at the dose rates higher than that changes into a buzzing sound which faints at higher dose rates.
Energy source for the instrument is built-in battery that can provide power continuously for 100 hours. For changing the battery, back cover of the instrument must be removed. With almost empty batteries, sound becomes weaker.
| Detector | cylindrical halogen Geiger Mueller tube type SBM 20 |
| High voltage | 400 V |
| Background | aprox. 10 imp/min (100 nSv/h) |
| Cracking | to aprox. 1 µSv/h |
| Crunching | from aprox. 1 µSv/h to aprox. 10 µSv/h |
| Buzzing | over 10 µSv/h |
| Limit of use | aprox. 1 Sv/h |
| Power supply | battery, 9V |
| Dimensions | 135 x 60 x 30 mm (L x W x H) |
| Mass | 230 g |
| Title | Description | Filename |
|---|---|---|
| Leaflet GMM 78 | GMM_78-0.pdf |
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We have been working with AMES for more than a decade and they are a reliable partner, who takes care that their equipment works flawlessly, gives professional support and is always ready to listen to the customer's wtishes when it comes to upgrades.
Bernarda Podgoršek Kovač
Manager of the environmental protection service
