Cesium 134 and 137 in Tokyo rooftop dust

[This is a guest written article, views expressed are the authors alone and may not be endorsed by Safecast] This is a gamma spectrum of dust wiped from a Tokyo rooftop.  The detector is located at Worcester Polytechnic Institute’s Physics Department.  The results are estimates because of the low weight of dust in the sample.…

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Measuring hot particles from air filters

[This is a guest written article, views expressed are the authors alone and may not be endorsed by Safecast] In the last month we have received 22 vehicle air filters from safecasters.  These came from vehicles used primarily in Fukushima City, Tokyo, and Iwaki.  The Fukushima City filters had total radiation levels that averaged about…

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