The network is comprised of ordinary citizens whom each record five radiation measurements per day. Each person had been provided a geiger counter equipped with an electronic timer to measure radiation levels. The geiger counter we use is called the "Radalert." The Radalert can be used in several different ways. Our method is to set the Radalert to the "counts per minute" mode. Each count of an ionizing event is recorded by the geiger counter. At the end of each minute, it displays the counts in a liquid crystal display window. That user then writes the count on a data sheet along with the time and weather conditions. The monthly data sheets are collected and reviewed by professional advisors.
We also utilize five stationary low-level air samplers located within a two mile radius around Three Mile Island. These monitors are able to distinguish and record Alpha and Beta radiation. The data is collected by the Dickinson College physics Department and analyzed quarterly. A control station low-level air sampler is located a Dickinson College for comparison.
© 2003-2008 EFMR Monitoring Group