A twelve day Geiger counter reading was taken of the radioactive fallout which rained down on Saint Louis Missouri during the 11/8/11 rain event. The sample shows evidence of persistent long half life radiation which is capable of accumulating in the environment. This is not the first such detection we have encountered, but it is the longest continuous sample reading we have taken to date. The charts below show the evidence of the event; the raw data the charts were generate from will be made available for download shortly.
The detection reemphasizes the need to take cost effective risk mitigation measures; the primary measures we are taking are to avoid tracking the fallout into the house (wet clothes, wet cars in the garage), and protecting water and food intake.
Based on some good critiques via blog comments, we are in the process of revamping our rapid analysis methodology to reflect an increased level of uncertainty in identifying fallout with a less than one day half life. The increased uncertainty is not yet at a level to reduce or increase our risk mitigation strategies; but its influence is noticeable in the charts below. A video describing the detections below in greater detail will follow.
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