What is the difference between Roentgen, Sieverts and RAD? I've looked it up but I still don't understand what they exactly measure in terms of radioactivity. - Quora
![Civil Defense Museum - Radiation Instruments and Kits - Commercially Sold Radiation Meters For CD Use Civil Defense Museum - Radiation Instruments and Kits - Commercially Sold Radiation Meters For CD Use](http://www.civildefensemuseum.com/cdmuseum2/radkits/meters/bendkit/cdv736scale.jpg)
Civil Defense Museum - Radiation Instruments and Kits - Commercially Sold Radiation Meters For CD Use
![OC] Gamma radiation dose rates (Roentgen/hour) in the ruins of the Chernobyl reactor hall, 1988 : r/dataisbeautiful OC] Gamma radiation dose rates (Roentgen/hour) in the ruins of the Chernobyl reactor hall, 1988 : r/dataisbeautiful](https://external-preview.redd.it/e114kMcsM16-baKArzTK5Fo_P-GYcxe3RwyGBRBkPrk.jpg?width=640&crop=smart&auto=webp&s=f718b23473d3144de274b96535934763f9e09125)