Roentgen (unit) Roentgen (unit) The roentgen or röntgen () (symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays. It is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air. In 1928 it was the first international measurement quantity for ionising radiation to be defined for radiation protection, and was an easily replicated method of measuring air ionization directly by using an ion chamber. It is named after the German physicist Wilhelm Röntgen, who discovered X-rays. Although relatively easy to measure, it had
Kevin Roentgen co-produced with Noah Shain a project called Hott Mess, an album of 10 songs written and performed by Roentgen, Shain and singer Shayna Ross. In 2009, Croire en l'homme, was released as the b-side to the debut title track single from Johnny Hallyday's latest album, Ca n'finira jamais. Written by Roentgen and Oliver Leiber, the single debuted at #1 on the French Single Charts, the week of November 14, 2008, and remained number one for two weeks. Later that year, Roentgen produced the Light of Day EP for LA band, Analog Smith. In May 2012, Goldsboro, featuring Roentgen, Chris Cano