Louis Harold Gray

Louis Harold Gray

Louis Harold Gray (10 November 1905 - 9 July 1965) was a British physicist who worked mainly on the effects of radiation on biological systems, inventing the field of radiobiology as he went. A summary of his work is given below. Amongst many other achievements, he defined a unit of radiation dosage which was later named after him as an SI unit, the Gray.

Summary of Career

* 1933 Hospital physicist at Mount Vernon Hospital, London
* 1936 Developed the Bragg-Gray equation, the basis for the cavity ionization method of measuring gamma-ray energy absorption by materials
* 1937 Built an early neutron generator at Mount Vernon
* 1938 Studied biological effects of neutrons using the generator
* 1940 Developed concept of RBE (Relative Biological Effectiveness) of doses of neutrons
* 1952 Initiated research into cells in hypoxic tumors and hyperbaric oxygen
* 1953 Set up Gray Laboratory at Mount Vernon Hospital
* 1953 - 1960 Under Gray’s direction, Jack W. Boag developed pulse radiolysis
* 1962 Ed Hart (ANL) and Boag discovered the hydrated electron using pulse radiolysis at Gray Lab

This discovery initiated a new direction for chemistry research that is still very active today and is vital for understanding of the effects of radiation on biological tissue, for instance in cancer treatment.

External links

" Based in part on [http://www.jlab.org/FEL/helios/tsld009.htm this slide] and several subsequent and prior ones, with permission. "

* Definition of [http://hps.org/publicinformation/ate/q647.html RBE] .
* [http://www.lhgraytrust.org/index.html The LH Gray Memorial Trust] founded in 1967
* [http://www.medphysics.ucla.edu/more_gray.htm A biography]


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  • Louis Harold Gray — Louis Gray Pour les articles homonymes, voir Gray. Louis Harold Gray, fils unique d une famille londonienne, est né le 10 novembre 1905 à Londres. Il grandit dans un environnement défavorisé. Son père, taciturne, emmenait son fils dans… …   Wikipédia en Français

  • Louis Harold Gray — (* 10. November 1905 in London; † 9. Juli 1965 in Northwood) war ein britischer Physiker und Radiologe sowie Begründer der Radiobiologie. Seine Arbeit befasste sich mit der Wirkung von Strahlung und Radioaktivität auf biologische Systeme. Unter… …   Deutsch Wikipedia

  • Louis Harold Gray — noun English radiobiologist in whose honor the gray (the SI unit of energy for the absorbed dose of radiation) was named (1905 1965) • Syn: ↑Gray • Hypernyms: ↑radiobiologist …   Useful english dictionary

  • Gray — 〈[grɛı] n. 15; 〉 Einheit für die Energiedosis ionisierender Strahlen, 1 Gy = 1 J/kg = 100 rad [nach dem amerikan. Physiker Louis Harold Gray, 1905 1965] * * * Gray [greɪ; nach dem brit. Physiker L. H. Gray (1905–1965)], das; s; Einheitenzeichen:… …   Universal-Lexikon

  • Gray — puede referirse a: Contenido 1 Apellido 1.1 Personajes 1.1.1 Botánicos[1] 2 Divisiones administrativas …   Wikipedia Español

  • gray — [ grɛ ] n. m. • 1975; de Stephen Gray ♦ Métrol. Unité de mesure de dose absorbée de radiation (symb.Gy) communiquant à 1 kg de matière irradiée une énergie de 1 joule. ⇒ rad. ⊗ HOM. Grès. ● gray nom masculin (de Louis Harold Gray, nom propre)… …   Encyclopédie Universelle

  • Gray (surname) — Gray is a surname usually of Scottish origin, and may refer to many people.Also, there are many people in Ireland with the last name Gray that are not of Ulster Scot heritage. It can be an anglicanized version of of the native Irish MagRaith… …   Wikipedia

  • Gray (Familienname) — Gray ist ein englischer Familienname. Herkunft Der Name stammt überwiegend aus Schottland, z. T. auch Irland, und hat offenbar nichts mit grey „grau“ zu tun. Varianten Grey (Familienname) (nur scheinbar verwandt) Bekannte Namensträger… …   Deutsch Wikipedia

  • Louis Gray — can refer to:* Louis Herbert Gray, American orientalist * Louis Harold Gray, British radiation physicist after whom the SI unit, the Gray, was named …   Wikipedia

  • Gray (unite) — Gray (unité) Pour les articles homonymes, voir Gray. Le gray (symbole Gy) est l unité dérivée d énergie massique de radiation absorbée du Système international (SI). Un gray est la dose d énergie absorbée par un milieu homogène d une masse d un… …   Wikipédia en Français

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