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Units of Measure

Phil B. Fontanarosa

and Stacy Christiansen

UPDATE: We will discontinue using quotation marks to identify parts of an article, but retain the capitalization; eg, This is discussed in the Methods section (not the “Methods” section). This change was made February 14, 2013. Measurements of ionizing radiation and radioactivity should be reported by means of SI units. The SI units for radiation are established by international agreement. The unit for activity of a radionuclide is the becquerel; the absorbed dose of radiation (absorbed per unit weight of tissue) is the gray (Gy); and the dose equivalent used to indicate the detrimental effects of an absorbed radiation dose

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