Andy,

I did a quick and dirty calculation on a short file produced by my CRD. I am probably getting a rate of about 0.04 events/second, which is a bit less than I expected, but that rate has been consistent since 2020 when I first started capturing data.

My detector is Geiger tube based and I would expect it to be less efficient than a scintillator detector. Another big difference is the coincidence detector. I use high speed logic and the coincidence window of my detector is about 25ns compared to the 30us window of your detector. My muons only travel 7.5m in that time, still much bigger that the 60mm gap between the sensors planes. I would hope that although my detection rate is lower, the certainty of a genuine event is much better. The data is bursty, muons come in showers, so I need to do some more work on this measurement to get a better average.

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If I just do a monthly plot of the data :- ?

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By eye it looks like the rate is more like 2.5 events per 10s sample period. This equates to 0.25 events per second, different to my first rough calculation. But I suspect that the plot fills a lot of gaps and is not the right answer. Because the files are quite large I find simply importing to a spreadsheet a real pain. I need to write a bit of Python to do the job properly.

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I would think that you are probably not far from the correct rate with your instrument. Do the CosmicWatch rates take into account the height above sea level ?

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David

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