Proceedings of the British Institute of Radiology

Abstract

Proceedings of the British Institute of RadiologyPublished Online:28 Jan 2014https://doi.org/10.1259/0007-1285-35-417-650SectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InEmail AboutAbstractExperiments are described in which a 4 MeV linear electron accelerator was used to give a dose of ∼10,000 rads to a small liquid sample in 2 μseconds. Chemical reactions occurring in the sample were observed by measuring optical transmission in situ as a function of time at any chosen wavelength with the usual arrangement of light source, monochromator and cathode-ray oscilloscope. In ferrous ammonium sulphate solution this technique showed the existence of four distinct steps in the reaction with widely separated mean times. Each step appeared to be exponential and the slowest (lasting several seconds) was undoubtedly due to H2O2 oxidation. A study of oxygen dependence, Fe++ concentration dependence, and variation of spectrum with time made possible a tentative assignment of the three earlier steps to OH oxidation, HO2 oxidation and the build-up of the ferric-sulphate complex. In potassium iodide solution the linear build-up of di-iodide ion during the 2 μsecond pulse itself was observed, followed by decay of this unstable species to tri-iodide. Pure water showed several transient absorptions, all of which ultimately decayed to zero. Previous article Next article FiguresReferencesRelatedDetailsCited byFree Radical Mechanisms for the Treatment of Methyl tert -Butyl Ether (MTBE) via Advanced Oxidation/Reductive Processes in Aqueous Solutions23 January 2009 | Chemical Reviews, Vol. 109, No. 3Formate Ion Decomposition in Water Under UV Irradiation at 253.7 nm15 June 2004 | Environmental Science & Technology, Vol. 38, No. 14La radiolyse de l'eau et des solutions aqueuses : historique et actualitéCanadian Journal of Chemistry, Vol. 77, No. 9Rate of Hydrogen Atom Reaction with Ethanol, Ethanol- d5 , 2-Propanol, and 2-Propanol- d7 in Aqueous Solution13 February 1997 | The Journal of Physical Chemistry A, Vol. 101, No. 7 Volume 35, Issue 417September 1962Pages: 581-652 © The British Institute of Radiology History Published onlineJanuary 28,2014 Metrics Download PDF