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Title: Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas

Abstract

The CR-39 nuclear track detector is used in many nuclear diagnostics fielded at inertial confinement fusion (ICF) facilities. Large x-ray fluences generated by ICF experiments may impact the CR-39 response to incident charged particles. To determine the impact of x-ray exposure on the CR-39 response to alpha particles, a thick-target bremsstrahlung x-ray generator was used to expose CR-39 to various doses of 8 keV Cu-K{sub α} and K{sub β} x-rays. The CR-39 detectors were then exposed to 1–5.5 MeV alphas from an Am-241 source. The regions of the CR-39 exposed to x-rays showed a smaller track diameter than those not exposed to x-rays: for example, a dose of 3.0 ± 0.1 Gy causes a decrease of (19 ± 2)% in the track diameter of a 5.5 MeV alpha particle, while a dose of 60.0 ± 1.3 Gy results in a decrease of (45 ± 5)% in the track diameter. The reduced track diameters were found to be predominantly caused by a comparable reduction in the bulk etch rate of the CR-39 with x-ray dose. A residual effect depending on alpha particle energy is characterized using an empirical formula.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]
  1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Publication Date:
OSTI Identifier:
22392409
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALPHA PARTICLES; AMERICIUM 241; BREMSSTRAHLUNG; INERTIAL CONFINEMENT; KEV RANGE 01-10; MEV RANGE 01-10; PARTICLE TRACKS; RADIATION DOSES; X RADIATION

Citation Formats

Rojas-Herrera, J., E-mail: jimmy06@mit.edu, Rinderknecht, H. G., Zylstra, A. B., Gatu Johnson, M., Orozco, D., Rosenberg, M. J., Sio, H., Seguin, F. H., Frenje, J. A., Li, C. K., and Petrasso, R. D.. Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas. United States: N. p., 2015. Web. doi:10.1063/1.4913906.
Rojas-Herrera, J., E-mail: jimmy06@mit.edu, Rinderknecht, H. G., Zylstra, A. B., Gatu Johnson, M., Orozco, D., Rosenberg, M. J., Sio, H., Seguin, F. H., Frenje, J. A., Li, C. K., & Petrasso, R. D.. Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas. United States. doi:10.1063/1.4913906.
Rojas-Herrera, J., E-mail: jimmy06@mit.edu, Rinderknecht, H. G., Zylstra, A. B., Gatu Johnson, M., Orozco, D., Rosenberg, M. J., Sio, H., Seguin, F. H., Frenje, J. A., Li, C. K., and Petrasso, R. D.. Sun . "Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas". United States. doi:10.1063/1.4913906.
@article{osti_22392409,
title = {Impact of x-ray dose on the response of CR-39 to 1–5.5 MeV alphas},
author = {Rojas-Herrera, J., E-mail: jimmy06@mit.edu and Rinderknecht, H. G. and Zylstra, A. B. and Gatu Johnson, M. and Orozco, D. and Rosenberg, M. J. and Sio, H. and Seguin, F. H. and Frenje, J. A. and Li, C. K. and Petrasso, R. D.},
abstractNote = {The CR-39 nuclear track detector is used in many nuclear diagnostics fielded at inertial confinement fusion (ICF) facilities. Large x-ray fluences generated by ICF experiments may impact the CR-39 response to incident charged particles. To determine the impact of x-ray exposure on the CR-39 response to alpha particles, a thick-target bremsstrahlung x-ray generator was used to expose CR-39 to various doses of 8 keV Cu-K{sub α} and K{sub β} x-rays. The CR-39 detectors were then exposed to 1–5.5 MeV alphas from an Am-241 source. The regions of the CR-39 exposed to x-rays showed a smaller track diameter than those not exposed to x-rays: for example, a dose of 3.0 ± 0.1 Gy causes a decrease of (19 ± 2)% in the track diameter of a 5.5 MeV alpha particle, while a dose of 60.0 ± 1.3 Gy results in a decrease of (45 ± 5)% in the track diameter. The reduced track diameters were found to be predominantly caused by a comparable reduction in the bulk etch rate of the CR-39 with x-ray dose. A residual effect depending on alpha particle energy is characterized using an empirical formula.},
doi = {10.1063/1.4913906},
journal = {Review of Scientific Instruments},
number = 3,
volume = 86,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2015},
month = {Sun Mar 15 00:00:00 EDT 2015}
}