Determination of the absorbed dose to water for high-energy photons and electrons by total absorption of electrons in ferrous sulphate solution
- 1 December 1982
- journal article
- Published by IOP Publishing in Physics in Medicine & Biology
- Vol. 27 (12) , 1435-1447
- https://doi.org/10.1088/0031-9155/27/12/002
Abstract
An arrangement is described for determining the relation between the energy imparted to ferrous sulphate (Fricke) solution by total absorption of 5.6 MeV electrons and the yield of ferric ions produced in the solution. Since the energy imparted is derived from measurements of basic quantities, the method represents an absolute determination of the absorbed dose to water. By means of ampoules filled with calibrated Fricke solution the beam of a cobalt source was measured to serve as a PTB standard for the quantity absorbed dose to water under specified conditions. The total uncertainty of this method of determining the absorbed dose to water for electrons and photons in the energy range above 1 MeV appears to be smaller than that of the calorimetric method, which is also applied in the author's laboratory for photon radiation.Keywords
This publication has 22 references indexed in Scilit:
- Determination of Cλ and CE conversion factors and stopping power ratios using calibrated ferrous sulphate dosemetersPhysics in Medicine & Biology, 1982
- The National Physical Laboratory secondary standard therapy-level X-ray exposure meterThe British Journal of Radiology, 1972
- A current transformer and gated integrator for measurement of weak currents from pulsed acceleratorsNuclear Instruments and Methods, 1971
- An empirical equation for the backscattering coefficient of electronsNuclear Instruments and Methods, 1971
- Electron beam current monitoring systemNuclear Instruments and Methods, 1971
- Rückstreung von elektronen bei 0.25 und 0.5 MeV an aluminiumNuclear Instruments and Methods, 1970
- The effect of the wall on the Fricke dosemeterThe International Journal of Applied Radiation and Isotopes, 1969
- Backscattering of 1-MeV electrons from siliconNuclear Instruments and Methods, 1966
- A null method for calibrating faraday cupsNuclear Instruments and Methods, 1963
- Absolutmessung der teilchenflussdichte schneller elektronen mit einem Faraday-KäfigNuclear Instruments and Methods, 1962