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_Andy
2 Posts |
 Posted - 08/03/2023 : 08:13:20
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I am new to radiation and geiger counters, and just received my 500+ yesterday. I have set it up to deliver data to gmcmap,com, and have noticed a periodicity in the history data. I have not yet analyzed it statistically or even plotted it, so it is just from looking at the data on the website.
Is this a known property of background radiation, the specific tubes used, or the electronics, or maybe something specific to the area. I have looked briefly at nearby geiger counters, and it looks like they also exhibit similar behavior, however not as clear. |
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| Reply #1
EmfDev
2163 Posts |
Posted - 08/03/2023 : 09:13:28
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| hi Andy, what do you mean by periodicity? |
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| Reply #2
_Andy
2 Posts |
Posted - 08/03/2023 : 09:42:12
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| It cycles through reading from approx. 8 CPM to approx. 20 CPM in quite regular time intervals. When I get the time, I will try to do some statistics on the data, because a pure visual inspection can be deceiving. I was just curious if this was a known property of background radiation or the equipment. |
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| Reply #3
ullix
Germany
1116 Posts |
Posted - 08/04/2023 : 09:01:13
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@Andy, I bet this is nothing but statistics!
You can determine yourself: Get program GeigerLog and run its FFT (Fast Fourier Transform) on your data.
GeigerLog is Open source for free download from here:
https://sourceforge.net/projects/geigerlog/
You ask why such a function is even implemented in this software? Because, like you, I was almost convinced my Geiger data showed periodicity, so I implemented FFT ;-)). Nope, there never was one!
Oh, I correct myself: periodicity can be seen when you have a light-sensitive Geiger tube; which does happen quite often. Then FFT does indeed show you a 24 h Day-Night pattern. But if you can rule out light-sensitivity, then you'd be the first to find a periodicity!
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Periodicity in background radiation
