Advertisement

Capillary Neutron Optics for Boron Neutron Capture Therapy

  • Q. F. Xiao
  • V. A. Sharov
  • D. M. Gibson
  • H. Chen
  • D. F. R. Mildner
  • R. G. Downing

Abstract

Glass capillaries with narrow channels (diameters of a few microns) can guide and bend thermal and cold neutrons by means of multiple total external reflection. Capillary neutron optics, which consist of arrays of capillary fibers, have many applications including: neutron focusing, neutron imaging, and filtering of fast neutrons and gamma rays to produce a pure beam of slow neutrons for various applications. The transmission of neutrons through straight and bent capillary fibers has been measured using cold neutron beams from the research reactor at the National Institute of Standards and Technology. Experimental results have been compared with ray-tracing simulations. The good agreement indicates excellent neutron reflectivity from the reflecting surfaces of the capillary channels. A neutron optic assembled from 1763 glass capillary fibers has been used to focus a neutron beam from a 58Ni-coated neutron guide with exit dimensions of 50 × 45 mm2 and focus it to a 0.53 mm diameter spot (FWHM) with an average neutron current density gain of 80. We also report studies of a simple prototype neutron bender/focuser which bends a thermal neutron beam and focuses it to a submillimeter spot. The applications of using capillary neutron optics for boron neutron capture therapy for cancer are discussed.

Keywords

Fast Neutron Neutron Beam Transmission Efficiency Boron Neutron Capture Therapy Cold Neutron 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    M. A. Kumakhov, “Channeling of photons and new x-ray optics”, Nucl. Instrum. & Meth. B 48, 283–286 (1990).Google Scholar
  2. 2.
    M. A. Kumakhov and V. A. Sharov, “A neutron Lens”, Nature, 357, 390–391, (1992).CrossRefGoogle Scholar
  3. 3.
    H. Chen, R. G. Downing, D. F. R. Mildner, W. M. Gibson, M. A. Kumakhov, I. Yu. Ponomarev and M. A. Gubarev, “Guiding and focusing neutron beams using capillary optics”, Nature 357, 391–393 (1992).CrossRefGoogle Scholar
  4. 4.
    Q. F. Xiao, H. Chen, D. F. R. Mildner, R. G. Downing and R. E. Berenson, “A comparison of experiment and simulation for neutron guidance through glass polycapillary fibers”, Rev. Sci. Instrum. 64, 3252–3257 (1993).Google Scholar
  5. 5.
    H. Chen, D. F. R. Mildner, R. G. Downing, R. E. Benenson, Q. F. Xiao and V. A. Sharov, “Neutron focusing using capillary optics”, Nucl. Instrum. & Meth. B 89, 401–411 (1994).Google Scholar
  6. 6.
    H. Chen, D. F. R. Mildner and Q. F. Xiao, Appl. Phys. Lett., “Neutron focusing lens using polycapillary fibers”, 64, 2068–2070 (1994).Google Scholar
  7. 7.
    Q. F. Xiao, H. Chen, V. A. Sharov, D. F. R. Mildner, R. G. Downing, N. Gao and D. M. Gibson, “Neutron focusing optics for submillimeter material analysis”, Rev. Sci. Instrum. 65, 3399–3402 (1994).CrossRefGoogle Scholar
  8. 8. R. G. Downing, C. J. Zeissler and H. Chen, “High resolution charged particle and neutron imaging using charge injection devices”, SPIE Proc. 1737, 308–321 (eds., J. M. Cat’enicr D. B. Cline, R. Lanza and D. E Mildner), (1993). Google Scholar
  9. 9.
    D. J. Barber and R. Loudon, “An Introduction to the Properties of Condensed Matter”, Cambridge University Press (1989).Google Scholar
  10. 10.
    S. F. Mughabghab, D. Divadeenam and N. E. Holden, “Neutron cross sections”, Academic Press (1981).Google Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • Q. F. Xiao
    • 1
  • V. A. Sharov
    • 1
  • D. M. Gibson
    • 1
  • H. Chen
    • 2
  • D. F. R. Mildner
    • 2
  • R. G. Downing
    • 2
  1. 1.X-Ray Optical Systems, Inc.AlbanyUSA
  2. 2.National Institute of Standards and TechnologyGaithersburgUSA

Personalised recommendations