This evening the web site showing radioactivity in the U.S. came back on line. At 21:46 MST the CPMs by states were: WA 32, AZ 19, CO 58 and 24, IN 36, NJ 22, NC 33. According to the site explanation, normal background radiation may average from 10 to 50 and the alert level suggesting an extraneous component is set at 130. Nevertheless, translation of CPM counts into dose rates as rem per unit time requires knowledge of the type of irradiation, which must be determined by a different method. In the case of 0.66 MeV Cesium-137 gamma rays, the true dose rate affecting the human body involves multiplying the CPM by a factor of 20. So "the jury is still out" regarding whether or not the U.S. CPMs reflect fallout from the damaged Japanese nuclear reactors.
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