RöntgenThe röntgen (symbol R) is a unit of dosage of X-rays or gamma radiation, being the dose that liberates positive and negative charges of 2.58×10-4 coulombs per kilogram of air. It is named after the physicist Wilhelm Röntgen. Natural background is around 10 μR per hour. 500 R in 5 h is lethal for humans. Category:Units of radiation dose\n |
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