Packing List:
1. GMC-800 main unit.
2. USB cable
3. Quick start guide
How it works?
The GQ-800 Geiger Counter installed a Geiger tube to detect radiation.
When the radiation passes through the Geiger tube, it triggers electrical pulses for the CPU to register as
count. The basic count rate unit is CPM (Count Per Minute). The CPM count rate indicates the radiation
level and it can be converted to other traditional radiation units, such as uSv/h or mR/h.
After GMC-800 is turned on, it will show the background radiation reading. The background radiation
reading (in CPM) indicates the nature radiation detected at that minute. This reading may change from
time to time and location to location. To get an accurate reading, user may need to get an average value
over a longer time period.
Caution
1. Avoid doing measurements when the battery is low.
2. Do not get the Geiger counter wet. Use a sealed plastic bag to avoid moisture.
2. Avoid doing measurements in direct sunlight.
3. Avoid directly contact with the radioactive material. Use a sealed plastic bag if needed.
4. Turn off the unit when not in use.
5. Keep it in a protective pouch after use.
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Background Safe Levels
Suggested background readings levels:
1. Safe level. Less than 50CPM or 0.25uSv/h. Nothing to worry about
2. Attention level. 51CPM – 99CPM. OR 0.26uSv/h – 0.39uSv/h . Unnaturally high, time to figure out
what is wrong
3. Warning level. More than 100CPM or more than 0.40uSv/h. Dangerous to stay in this area for long.
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