title: Development of a secondary standard for the absorbed dose to water based on the alanine EPR dosimetry system.
abstract: The primary measurand in the dosimetry for radiation therapy is the absorbed dose to water, D(W). An alanine/EPR based secondary standard for D(W) for high-energy photon and electron radiation is presently under construction at the Physikalisch-Technische Bundesanstalt. A technique of transfer dosimetry that makes it possible to reduce the reproducibility to a level below 0.5% in the 5-50 Gy range is presented. It takes advantage of a reference sample. Results of investigations of some effects, such as environmental humidity, are presented.
authors.affiliation: Physikalisch-Technische Bundesanstalt, FB6.2 Dosimetrie fuer die Strahlentherapie, Bundesallee 100, D-38116 Braunschweig, Germany. mathias.anton@ptb.de
authors.forename: Mathias
authors.initials: M
authors.lastname: Anton