Noah Ernest Dorsey (March 15, 1873 – July 6, 1959)^[1] was an American physicist, known for his contributions to measurement technology.

Dorsey was born inAnnapolis, Maryland and studied atJohns Hopkins University where he obtained aB.A. (1893) and aPh.D. (1897). He worked at the same place a few years, was with U. S. Bureau of Soils and the Department of Agriculture as well, before he eventually joinedNational Bureau of Standards (1903) where he stayed until retirement in 1943. His research was on standards of radioactivity and x-ray measurements (1914–22), becoming the leader of the Radium Section (1921) and publishing a widely used book covering this emerging field, including specifications of his own bodily injuries from interactions with radium and radon.

Dorsey died inTowson, Maryland on July 6, 1959 at the age of 86.^[2]

• The Physics of Radioactivity (1921)

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