Detailed text transcripts for TV channel - CNN - 20110318:11:55:00
Monitor the air on a 24/7 basis thanks to equipment like this. we're in downtown san francisco on top of a seven-story building. here, the epa has deployed one of its radiation monitors. eric stevenson manages the equipment on behalf of the federal agency. >> it's basically in place to ensure that if there are any changes in the background radiation levels that we know about it quickly and that we can take effective action. >> reporter: there are more than a hundred of these devices spanned out across the country. part of the radiation detection program that dates back to the 1950s when the un...
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