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Scintillators and Semiconductor Detectors

  • Ivan VeroneseEmail author
Chapter

Abstract

Various processes occur during the detection of ionizing radiation within a scintillator, and proper detection designs are needed [1, 2, 3]. As a consequence of the interaction of radiation with the scintillation material, ionisation and excitation processes arise, and the energy (or part of it) of the incoming radiation is transferred to the atoms and molecules of the scintillator. Following deexcitation processes, photons originate in the ultraviolet/visible (UV/VIS) region of the electromagnetic spectrum, light that must be collected and converted in a suitable electric signal. In many cases, light collection simply may be obtained by coupling the scintillator directly with an optical detector, typically a photomultiplier tube (PMT). In other cases, depending on the particular application or measurement geometry, a light guide is required, which efficiently transmits the light emitted by the scintillator to the optical device. Finally, light photons are converted into electrons, and the resulting basic electric signal is amplified and properly processed. Let us consider in more detail the scintillation conversion mechanism in a wide band-gap material. This process may be explained by considering the energy band structure of an activated crystalline scintillator. An inorganic scintillator is indeed usually a crystalline solid containing a small amount of dopant, acting as a luminescent centre, which creates energy levels within the forbidden band between the valence band and the conduction band. Moreover, the natural impurities and defects present in the crystal are the origination of other energy levels, which may act as traps during the charge transport.

Keywords

Hole Pair Luminescent Centre Positron Emission Tomographic Effective Atomic Number Spectral Responsivity 
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.

References

  1. 1.
    Nikl M. Scintillation detectors for x-rays. Meas. Sci. Technol. 17, R37–R54 (2006).CrossRefGoogle Scholar
  2. 2.
    van Eijk C.W.E. Inorganic-scintillator development. Nucl. Instr. Meth. Phys. Res. A, 460, 1–14 (2001).CrossRefGoogle Scholar
  3. 3.
    Weber M.J. Scintillation: mechanism and new crystals. Nucl. Instr. Meth. Phys. Res. A, 527, 9–14 (2004).CrossRefGoogle Scholar
  4. 4.
    Knoll G.F. Radiation detection and measurements. (Wiley, New York) (2000) ISBN 0-471-07338-5.Google Scholar
  5. 5.
    Roentgen W.C. On a new kind of rays. Science 3, 227–231 (1986).CrossRefGoogle Scholar
  6. 6.
    Hofstadter R. Alkali Halide Scintillation Counters. Phys. Rev. 74, 100–101 (1948).CrossRefGoogle Scholar
  7. 7.
    Cherry S.R., Soreson J.A., Phelps M.E. Physics in Nuclear Medicine (Saunders, Philadelphia) (2003) ISBN-13: 978–0–7216–8341–6; ISBN-10: 0–7216–8341-X.Google Scholar
  8. 8.
    van Loef E.V.D., Dorenbos P., van Eijk C.W.E., Krämer K., Güdel H.U. High-energy resolution scintillator: Ce3 + activated LaCl3. Appl. Phys. Lett. 77, 1467–1468 (2000).CrossRefGoogle Scholar
  9. 9.
    van Loef E.V.D., Dorenbos P., van Eijk C.W.E., Krämer K., Güdel H.U. High-energy resolution scintillator: Ce3 + activated LaBr3. Appl. Phys. Lett. 79, 1573–1575 (2001).CrossRefGoogle Scholar
  10. 10.
    Tyrrel G.C. Phosphors and sintillators in radiation imaging detectors. Nucl. Instr. Meth. Phys. Res. A, 546, 180–187 (2005).CrossRefGoogle Scholar
  11. 11.
    Van Eijk C.W.E. Inorganic scintillators in medical imaging. Phys. Med. Biol. 47, R85–R106 (2002).CrossRefPubMedGoogle Scholar
  12. 12.
    Wiekzorec H. and Overdick M. Afterglow and hysteresis in CsI:Tl. Proc. 5th International Conference on Inorganic Scintillators and Their Application (Moscow: M.L. Lomonosov Moscow State University), 385–390 (2000).Google Scholar
  13. 13.
    Weber M.J. and Monchamp R.R. Luminescence of Bi4Ge3O12: spectral and decay properties. J. Appl. Phys. 44, 5495–5499 (1973).CrossRefGoogle Scholar
  14. 14.
    Takagi K. and Fukazawa T. Cerium-activated Gd2SiO5 single crystal scintillator. Appl. Phys. Lett. 42, 43–45 (1983).CrossRefGoogle Scholar
  15. 15.
    Melcher C.L. and Schweitzer J.S., 1992 Cerium-doped lutetium oxyorthosilicate: a fast, efficient new scintillator. IEEE Trans. Nucl. Sci. 39, 502–505 (1992).CrossRefGoogle Scholar
  16. 16.
    Minkov B.I. Promising new luthetium based single crystals for fast scintillation. Funct. Mater. 1, 103–105 (1994).Google Scholar
  17. 17.
    Yamada H., Suzuki A., Uccida Y., Yoschida M., Yammoto H. A scintillator Gd2O2S:Pr,Ce,F for x-ay computed tomography. J. Electrochem. Soc. 136, 2713–2720 (1989).Google Scholar
  18. 18.
    Rossner W., Ostertag M., Jermann F. Properties and applications of gadolinium oxysulfide based ceramic scintillators. J. Electrochem. Soc. 98–24, 187–194 (1995).Google Scholar
  19. 19.
    Greskovich C. and Duclos S. Ceramic scintillators. Ann. Rev. Mater. Sci. 27, 69–88 (1987).Google Scholar
  20. 20.
    Liu B. and Shi C. Development of medical scintillator. Chin. Sci. Bull. 47, 1057–1063 (2002).CrossRefGoogle Scholar
  21. 21.
    Novotny R. Inorganic scintillators – a basic material for instrumentation in physics. Nucl. Instr. Meth. Phys. Res. A, 537, 1–5 (2005).CrossRefGoogle Scholar
  22. 22.
    Budde W. Physical Detectors of Optical Radiation. Optical Radiation Measurements Vol. 4 (London Academic Press, New York) (1983) ISBN 0–12–304904–0.Google Scholar
  23. 23.
    Lutz G. Semiconductor Radiation Detectors. Device Physics (Springer, Berlin) (1999) ISBN 3–540–64859–3.Google Scholar
  24. 24.
    Omnes F. Optoelectronic Sensors. Chapter 1 (Didier Decoster and Joseph Harari, Polytech’Lille, France) (2009) ISBN: 9781848210783.Google Scholar

Copyright information

© Springer Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Dipartimento di FisicaUniversità degli Studi di Milano and INFN, Sezione di MilanoMilanItaly

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