LRO Cosmic Watch Muon Detectors and radioactive source

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andrew....@googlemail.com

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May 2, 2026, 1:05:15 PM (9 days ago) May 2
to sara...@googlegroups.com

 

I recently obtained a piece of radioactive rock from ebay and have tried placing it onto of my 2 CosmicWatch detectors (in coincidence) – to my surprise the detection level DROPPED when the rock was placed on top of the detectors, and rose again once the rock was removed – see screenshot below. I was expecting the level to go UP when rock placed on top of the detectors and DOWN again when removed. Can anyone explain the discrepancy for me? The Grafana dashboard for these muon detectors with more data is available at following URL:

 

cosmicwatch.astronomy.me.uk

 

Andy

 

 

 

 

 

 

 

 

 

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