Relative radiation risk... Recently, we get a lot of radiation values in our news streams and very few have comparison data to estimate: is this normal, elevated, severe or hazardous? Distrust and panic may result. Here, I aim to provide a bit of grounding.
Most simple Geiger counters, as used on this site and in many places, are good for a warning to stay indoors in case of black rain from nuclear fallout. Sensitive as they may be, they are hardly sensitive enough to quickly and reliably detect the small additional activity within the normal background radiation to isolate the contribution from a ground or food sample. It usually takes heavy shielding and good spectrometry to tell that story truthfully.
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