Honestly there is not any significance or relevance to this since the readouts are generic outputs. Unless there is context to type of radiation detected this really doesn't mean anything. Location of the meters is important. CPM simply refers to events and amount of times an event was detected. This provides no RAD/REM/ SIEVERT levels this isn't detecting gamma or neutron radiation emissions unless it's a dual monitoring system. Its generally specific to alpha and beta particles as a monitoring system and the factors impacting such readings are almost immeasurable/astronomical.

Interesting to research for folks that are unfamiliar with radiation/ radioactive isotopes-particles, sure, but not much value in concern over monitoring detections like this.