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Title: Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns

Abstract

The occurrence of saturation in CR39 solid state nuclear track detectors has been systematically studied as a function of the incident ion ({alpha} particles and laser-accelerated protons) fluence and the etching time. When overexposed (i.e., for fluences above {approx}10{sup 8} particles/cm{sup 2}) and/or overetched, the CR39 detectors enter a saturated regime where direct track counting is not possible anymore. In this regime, optical measurements of saturated CR39 detectors become unreliable as well, since the optical response of the saturated detectors with respect to the ion fluence is highly nonlinear. This nonlinear optical response is likely due to scattering from the surface of irregular clumping patterns which have a diameter {approx}20 {mu}m, i.e., ten times larger than the diameter of individual tracks. These patterns, which aggregate many individual tracks, are observed to develop in highly saturated regimes. For fluences typical of high energy short pulse laser experiments, saturation occurs, inducing the appearance of artifact ringlike structures. By careful microscopic analysis, these artifact ring patterns can be distinguished from the genuine rings occurring below saturation and characteristic of low energy laser accelerated proton beams.

Authors:
; ; ;  [1];  [2];  [3]
  1. Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 (United States)
  2. (France)
  3. (United States)
Publication Date:
OSTI Identifier:
20953234
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78; Journal Issue: 1; Other Information: DOI: 10.1063/1.2400020; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALPHA PARTICLES; DIELECTRIC TRACK DETECTORS; ETCHING; IONS; LASERS; NONLINEAR PROBLEMS; PARTICLE TRACKS; PROTON BEAMS; PROTONS

Citation Formats

Gaillard, S., Fuchs, J., Renard-Le Galloudec, N., Cowan, T. E., Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 and Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605, CNRS-CEA-Ecole Polytechnique-Universite Paris VI, 91128 Palaiseau Cedex, and Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557. Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns. United States: N. p., 2007. Web. doi:10.1063/1.2400020.
Gaillard, S., Fuchs, J., Renard-Le Galloudec, N., Cowan, T. E., Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 and Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605, CNRS-CEA-Ecole Polytechnique-Universite Paris VI, 91128 Palaiseau Cedex, & Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557. Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns. United States. doi:10.1063/1.2400020.
Gaillard, S., Fuchs, J., Renard-Le Galloudec, N., Cowan, T. E., Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 and Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605, CNRS-CEA-Ecole Polytechnique-Universite Paris VI, 91128 Palaiseau Cedex, and Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557. Mon . "Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns". United States. doi:10.1063/1.2400020.
@article{osti_20953234,
title = {Study of saturation of CR39 nuclear track detectors at high ion fluence and of associated artifact patterns},
author = {Gaillard, S. and Fuchs, J. and Renard-Le Galloudec, N. and Cowan, T. E. and Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557 and Laboratoire pour l'Utilisation des Lasers Intenses, UMR 7605, CNRS-CEA-Ecole Polytechnique-Universite Paris VI, 91128 Palaiseau Cedex and Nevada Terawatt Facility, Physics Department, University of Nevada, Reno, Nevada 89557},
abstractNote = {The occurrence of saturation in CR39 solid state nuclear track detectors has been systematically studied as a function of the incident ion ({alpha} particles and laser-accelerated protons) fluence and the etching time. When overexposed (i.e., for fluences above {approx}10{sup 8} particles/cm{sup 2}) and/or overetched, the CR39 detectors enter a saturated regime where direct track counting is not possible anymore. In this regime, optical measurements of saturated CR39 detectors become unreliable as well, since the optical response of the saturated detectors with respect to the ion fluence is highly nonlinear. This nonlinear optical response is likely due to scattering from the surface of irregular clumping patterns which have a diameter {approx}20 {mu}m, i.e., ten times larger than the diameter of individual tracks. These patterns, which aggregate many individual tracks, are observed to develop in highly saturated regimes. For fluences typical of high energy short pulse laser experiments, saturation occurs, inducing the appearance of artifact ringlike structures. By careful microscopic analysis, these artifact ring patterns can be distinguished from the genuine rings occurring below saturation and characteristic of low energy laser accelerated proton beams.},
doi = {10.1063/1.2400020},
journal = {Review of Scientific Instruments},
number = 1,
volume = 78,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}
  • Quantifying the ion pits in Columbia Resin 39 (CR39) nuclear track detector from Thomson parabolas is a time consuming and tedious process using conventional microscope based techniques. A simple inventive apparatus for fast screening and qualitative analysis of CR39 detectors has been developed, enabling efficient selection of data for a more detailed analysis. The system consists simply of a green He-Ne laser and a high-resolution digital single-lens reflex camera. The laser illuminates the edge of the CR39 at grazing incidence and couples into the plastic, acting as a light pipe. Subsequently, the laser illuminates all ion tracks on the surface.more » A high-resolution digital camera is used to photograph the scattered light from the ion tracks, enabling one to quickly determine charge states and energies measured by the Thomson parabola.« less
  • Comparative measurements of neutron flux for low-level irradiations in the MOL-..sigma sigma.. reactor have been carried out using gold and indium foils and various solid-state nuclear track detectors (SSNTDs) in conjunction with fissile (n,f) and fertile (/sup 6/Li and /sup 10/B)(n,..cap alpha..) converter foils as well as intrinsic detectors. Experimental and computed values of thermal and epithemal neutrons, using /sup 6/Li and /sup 10/B, are also presented for other arrangements. The results show good agreement and internal consistency for both thermal- and fast-neutron fluences, thus confirming the use of SSNTDs as absolute dosimetric devices.
  • The project is carried out using a small Mather type plasma focus device powered by a 15 kV, 30 {mu}F capacitor. The filling gas used is argon. The ion beam generated is investigated by both time resolved and time integrated methods. Investigation on the dynamic of the current sheath is also carried out in order to obtain an optimum condition for ion beam production. The angular distribution of the ion emission is measured at positions of 0 deg. (end-on), 45 deg. and 90 deg. (side-on) by using CR-39 nuclear track detectors. The divergence of the ion beam is also determinedmore » using these detectors. A biased ion collector is used for time resolved measurement of the ion beam. Time of flight technique is employed for the determination of the ion beam energy. Average ion beam energy obtained is about 180 keV. The ion beam produced can be used for applications such as material surface modification and ion implantation.« less
  • A study of pore formation in polyimide films irradiated with high-energy argon, krypton, or tungsten ions and subsequently treated with concentrated hydrogen peroxide is presented. The dimensions of the destruction zone and those of the area of polymer structure modification and increased chemical stability are estimated. The rate of polyimide etching along the tracks, and the selectivity of etching are determined. The feasibility of manufacturing polyimide track membranes with either cylindrical or conical pores is demonstrated.