A new model to account for track overlap in CR-39 data

نویسندگان

  • A. B. Zylstra
  • J. A. Frenje
  • F. H. Séguin
  • M. Gatu Johnson
  • D. T. Casey
  • M. J. Rosenberg
  • C. K. Li
  • R. D. Petrasso
  • Y. Kim
  • H. W. Herrmann
چکیده

The solid-state nuclear track detector CR-39 is widely used as a detecting mechanism in physics experiments as well as for industrial purposes such as neutron dosimetry and radon detection. The upper limit of detectable charged-particle fluence on CR-39 is set by physical overlapping or ‘pulse pileup’ of particle tracks on the surface. In the low-overlap regime the overlapping fraction of tracks scales as χ ≡ η × (πD̄) where η is the density of tracks and D̄ is the average track diameter. We report on the development of a Monte Carlo simulation to predict the severity of track overlap for any fluence of an arbitrary diameter distribution of tracks. Furthermore, we present an algorithm to correct for particle-track overlap in a post-hoc manner based on these Monte Carlo simulations, which can extend the upper fluence limit for a quasi-monoenergic source by a factor of 3− 4 when counting accuracies ∼ 10% are acceptable.

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تاریخ انتشار 2012