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 2.GQ Geiger Muller Counter
 GCM-600+ Spike while on iPhone

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T O P I C    R E V I E W
kamilw Posted - 05/31/2019 : 08:44:06
Hi All,

My counter shows ~20-30 CPM at home, but once I place it on top of you iPhone and leave it there, it consistently goes up to 60-70 CPM.

Any insight why that is the case?

Thanks
5   L A T E S T    R E P L I E S    (Newest First)
ortegaalfredo Posted - 06/15/2019 : 18:13:27
Just put my GCM-600+ on top of my phone (Samsung S9+) and called it 4 times.

Readings didnt increased notably. They went from 37 CPM to 45 CPM, all within normal variation. Just a datapoint.
stduser111 Posted - 06/04/2019 : 16:39:10
quote:
Originally posted by ullix
And EmfDev is eager to state that not only the GQ but "99% of household dosimeters" suffer from this problem. I would like to know which dosimeters belong to the remaining 1% category?

That was my comment. I do not remember the name of those models, but you will not find such a model among the cheap ones. If it is so important for you, then you can try to open the device and shield the PCB using aluminum foil.
But I do not think this is a big problem. It is very easy to distinguish ionizing radiation from electromagnetic interference.
ullix Posted - 06/04/2019 : 01:13:14
@kamilw: interesting observation. I tested my 300E+ counter by putting it on an Android smartphone. CPMs didn't change. However, when I started a phone call on this phone, and then put the counter on it, the CPMs increased from 20CPM to ~35CPM.

So it demonstrates that you have to well consider the environment of your counter. Some strange results may be explained by such interference!

And EmfDev is eager to state that not only the GQ but "99% of household dosimeters" suffer from this problem. I would like to know which dosimeters belong to the remaining 1% category?
EmfDev Posted - 06/03/2019 : 09:09:28
Hi kamilw, do you hear more click sounds as the cpm increases?
stduser111 Posted - 06/01/2019 : 17:04:25
Hi. This is normal. This is electromagnetic interference due to the fact that the processor is not shielded. 99% of household dosimeters on the market have such a problem. Just do not bring the dosimeter too close to powerful sources of non-ionizing electromagnetic radiation.

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