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Update: 05/6/18 - Smoky Mountain Alerts
Over the last couple of months, a Monitoring Station in Asheville, NC has been intermittently alerting at over 100 CPM. Listed below are graphs from late February and this month.
For context, the operator runs a PRM-9000 model built around an ultra-sensitive pancake style Geiger-Mueller tube. It is located in an upstairs room of his house. When this wave action first began in February, he corroborated the elevated readings by getting a second Geiger counter of the exact same model, so we think the detector is not defective. The graph pattern of the undulating wave crossing back and forth across the 100 CPM Alert level is reminiscent of a Radon event as we've often seen with other stations. So I instructed the station operator to assure that the monitoring room was well ventilated. I am also asking the operator to conduct an experiment where the end window is temporarily sealed so that alpha detection (associated with Radon decay) is halted for the moment.
Beyond that, the operator is exploring another theory that a local landfill (Buncombe) is emitting radioactive contamination of a sort, as he conducted a radiation survey onsite, and recorded readings peaking in the 150 to 200 CPM range, against normal background of around 40 CPM. The question is if the elevated readings are coming from the dumping of radioactive fly ash? (a byproduct of coal-fired power plants) at that landfill.
Another theory suggests that the elevated detection is sourced from Oak Ridge National Laboratories, located across the Smoky Mountains in Tennessee, about 80 miles to the west northwest. For instance, this re-posted link describes their recent preparation and transfer of nuclear waste:
Not to be excluded, there are two nuclear plants operating to the west, along the Tennessee River in southeastern TN, although one might expect a radioactive release to be picked up by other Monitoring Stations in the region, beyond the Asheville station.
Update: 01/18/18 - Best Logistics for Radiation Monitoring
Meanwhile, receiving queries about our Monitoring Stations in Alaska and Hawaii. At the height of the post-Fukushima level of interest, the Radiation Network had about 6 contributing stations from 3 of the Hawaiian Islands, as well as 4 stations reporting from Alaska. One of the Alaska stations is coming back online soon, and we hope the other resting stations will follow. As a reminder, the Radiation Network is a grass roots operation, and this author does not operate any but its own station. Rather, our network of stations is operated by regular people like you who want to contribute, and have or can obtain their own Geiger counter, and plug in. Please contact us if you wish to join the Radiation Network.
real time Graph, from Mineralab in Prescott, Arizona. You can watch it update once per minute - your browser will automatically refresh. In addition to the graph itself changing over time, you will note updates in both the Counts Per Minute and Time sections.