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The Röntgen equivalent physical or rep (symbol rep) is a legacy unit of absorbed dose first introduced by Herbert Parker in 1945 to replace an improper application of the roentgen unit to biological tissue. It is the absorbed energetic dose before the biological efficiency of the radiation is factored in. The rep has variously been defined as 83 or 93 ergs per gram of tissue (8.3/9.3 mGy) or per cm3 of tissue.

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  • Das Rep (Einheitenzeichen: rep), vom engl. roentgen equivalent physical, war eine vor 1969 analog zum Rem vorgeschlagene, international nicht akzeptierte Maßeinheit zur Angabe der Energiedosis. Stattdessen wurde das mittlerweile auch veraltete Rad eingeführt. 1 rep = 83 bzw. 93 Erg/Gramm ≈ 1,2 bzw. 1,075 rad ≈ 0,012 bzw. 0,01075 Gray (de)
  • Le Röntgen equivalent physical, de symbole rep, est une ancienne unité d'équivalent de dose de radiation. Il correspond à la dose d'énergie absorbée par les tissus biologiques avant que le rayonnement soit efficace. Plus précisément, le rep est défini en tant que 93 ergs par gramme (soit 9,3 mGy). (fr)
  • The Röntgen equivalent physical or rep (symbol rep) is a legacy unit of absorbed dose first introduced by Herbert Parker in 1945 to replace an improper application of the roentgen unit to biological tissue. It is the absorbed energetic dose before the biological efficiency of the radiation is factored in. The rep has variously been defined as 83 or 93 ergs per gram of tissue (8.3/9.3 mGy) or per cm3 of tissue. At the time, this was thought to be the amount of energy deposited by 1 roentgen. Improved measurements have since found that one roentgen of air kerma deposits 8.77 mGy in dry air, or 9.6 mGy in soft tissue, but the rep was defined as a fixed number of ergs per unit gram. A 1952 handbook from the US National Bureau of Standards affirms that "The numerical coefficient of the rep has been deliberately changed to 93, instead of the earlier 83, to agree with L. H. Gray's 'energy-unit'." Gray's 'energy unit' was " one roentgen of hard gamma resulted in about 93 ergs per gram energy absorption in water". The lower range value of 83.8 ergs was the value in air corresponding to wet tissue. The rep was commonly used until the 1960s, but was gradually displaced by the rad starting in 1954 and later the gray starting in 1977. (en)
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  • Das Rep (Einheitenzeichen: rep), vom engl. roentgen equivalent physical, war eine vor 1969 analog zum Rem vorgeschlagene, international nicht akzeptierte Maßeinheit zur Angabe der Energiedosis. Stattdessen wurde das mittlerweile auch veraltete Rad eingeführt. 1 rep = 83 bzw. 93 Erg/Gramm ≈ 1,2 bzw. 1,075 rad ≈ 0,012 bzw. 0,01075 Gray (de)
  • Le Röntgen equivalent physical, de symbole rep, est une ancienne unité d'équivalent de dose de radiation. Il correspond à la dose d'énergie absorbée par les tissus biologiques avant que le rayonnement soit efficace. Plus précisément, le rep est défini en tant que 93 ergs par gramme (soit 9,3 mGy). (fr)
  • The Röntgen equivalent physical or rep (symbol rep) is a legacy unit of absorbed dose first introduced by Herbert Parker in 1945 to replace an improper application of the roentgen unit to biological tissue. It is the absorbed energetic dose before the biological efficiency of the radiation is factored in. The rep has variously been defined as 83 or 93 ergs per gram of tissue (8.3/9.3 mGy) or per cm3 of tissue. (en)
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  • Rep (Einheit) (de)
  • Röntgen equivalent physical (fr)
  • Röntgen equivalent physical (en)
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