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Seems odd to measure background radiation in such a specific area.

3 posted on 07/19/2017 11:36:08 PM PDT by FreedomStar3028 (Somebody has to step forward and do what is right because it is right, otherwise no one will follow.)

Yes, in that particular area, too.

Or say, Manhattan (no pun intended).

5 posted on 07/19/2017 11:49:14 PM PDT by SaveFerris (Luke 21:36 KJV Watch ye therefore, and pray always, that ye may be accounted worthy to escape all...)

Seems odd to measure background radiation in such a specific area.

Not really. I would imagine all of DC is being scanned continuously in a piecemeal fashion to create constantly updated base maps of local radiation densities. These base maps would be used to compare a real scan against in the event of an actual search for a nuclear device. Without the comparison to a base map the small signature of a shielded device might be mistaken for a natural radiation source but with the base map any changes (no matter how small) would stick out like a sore thumb.