CONSIDERATIONS ON THE TARGET SIZE IN A WALL-LESS NANODOSIMETER

In nanodosimetry, the ionization component of charged particle track structure is characterized by measuring the frequency distribution of ionizations in target volumes that simulate nanometric sites in liquid water. For the Ion Counter nanodosimeter at PTB, the sensitive volume is defined by the el...

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Bibliographic Details
Published inRadiation protection dosimetry Vol. 183; no. 1-2; p. 182
Main Authors Rabus, Hans, Hilgers, Gerhard, Ngcezu, Sonwabile Arthur, Bug, Marion
Format Journal Article
LanguageEnglish
Published England 01.05.2019
Subjects
Equipment Design
Ions - analysis
Models, Theoretical
Nanotechnology - instrumentation
Radiometry - instrumentation
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Summary:In nanodosimetry, the ionization component of charged particle track structure is characterized by measuring the frequency distribution of ionizations in target volumes that simulate nanometric sites in liquid water. For the Ion Counter nanodosimeter at PTB, the sensitive volume is defined by the electrical field and the extraction aperture. In this paper, a procedure is presented to define a cylindrical effective measurement target based on the second moments of the detection efficiency map. An analytical model of the efficiency map is developed to investigate the dependence of the simulated site size on the nanodosimeter's operating parameters. Within the limits of the simplifying assumptions, the model gives a reasonable approximation of the efficiency map.
ISSN:1742-3406
DOI:10.1093/rpd/ncy252