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An upgraded track structure model: experimental validation.

B Grosswendt1, V Conte2, P Colautti3

  • 1Guest at LNL-INFN, viale dell'Università 2, Legnaro I-35020, Italy.

Radiation Protection Dosimetry
|December 12, 2013
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Summary
This summary is machine-generated.

The track nanodosemeter investigates particle track properties by measuring ionization cluster sizes. Refined Monte Carlo simulations improve quantitative accuracy by revisiting cross-section data for secondary electrons.

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Area of Science:

  • * Physics
  • * Radiation Science
  • * Nanotechnology

Background:

  • * The track nanodosemeter at Legnaro National Laboratories (LNL) enables direct study of particle track characteristics.
  • * It measures ionization-cluster-size distributions in nanometer-sized target volumes.
  • * Accurate simulation of these distributions is crucial for understanding radiation interactions.

Purpose of the Study:

  • * To enhance the quantitative agreement between experimental measurements and Monte Carlo simulations of particle track structure.
  • * To refine the cross-section data used in the Monte Carlo model, particularly for secondary electron energy.
  • * To validate the HKS and Rudd models for impact ionization cross-sections.

Main Methods:

  • * Development and application of a dedicated Monte Carlo code for simulating ionization cluster sizes.
  • * Direct measurement of ionization-cluster-size distributions using the track nanodosemeter.
  • * Re-evaluation of cross-section data based on extensive track structure measurements.

Main Results:

  • * The Monte Carlo code successfully reproduces the general shape of measured cluster-size distributions.
  • * Quantitative differences between simulated and measured data were reduced through cross-section refinement.
  • * Specific focus was placed on impact ionization cross-sections for secondary electrons.

Conclusions:

  • * The study demonstrates the effectiveness of the track nanodosemeter for particle track investigation.
  • * Revisiting cross-section validity significantly improves simulation accuracy.
  • * The findings contribute to a more precise understanding of radiation interactions at the nanoscale.