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CONSIDERATIONS ON THE TARGET SIZE IN A WALL-LESS NANODOSIMETER
Hans Rabus1, Gerhard Hilgers1, Sonwabile Arthur Ngcezu2,3
1Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, Braunschweig, Germany.
Radiation Protection Dosimetry
|December 12, 2018
Summary
This study defines a cylindrical measurement target for nanodosimetry using the Ion Counter. The developed model approximates the nanodosimeter
Area of Science:
- Physics
- Radiation Science
- Nanotechnology
Background:
- Nanodosimetry characterizes charged particle track structure by measuring ionization in nanometric volumes.
- The Ion Counter at PTB uses electrical fields and extraction apertures to define its sensitive volume.
Purpose of the Study:
- To present a procedure for defining a cylindrical effective measurement target in nanodosimetry.
- To develop an analytical model for the nanodosimeter's detection efficiency map.
- To investigate the influence of operating parameters on simulated site size.
Main Methods:
- Defining a cylindrical effective measurement target using second moments of the detection efficiency map.
- Developing an analytical model of the detection efficiency map.
- Analyzing the dependence of simulated site size on nanodosimeter operating parameters.
Main Results:
- A procedure for defining a cylindrical effective measurement target was established.
- An analytical model of the detection efficiency map was developed.
- The model provides a reasonable approximation of the efficiency map under simplifying assumptions.
Conclusions:
- The presented procedure and analytical model aid in characterizing nanodosimeter performance.
- Understanding the relationship between operating parameters and simulated site size is crucial for accurate nanodosimetry.
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