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Amazon.com: Daydream Education Radioactive Decay | Science Posters | Laminated Gloss Paper measuring 33” x 23.5” | STEM Charts for the Classroom | Education Charts : Everything Else
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Here's a chart showing relative risk from radiation levels measured in Sieverts if you're monitoring the situation in Japan : r/science
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RADEX ONE Personal RAD Safety, High Sensitivity Compact Personal Dosimeter, Geiger Counter, Radiation Detector w/Software (U.S. Version): Amazon.com: Industrial & Scientific
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