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Chinese Physics C> 2014, Vol. 38> Issue(8) : 086005 DOI: 10.1088/1674-1137/38/8/086005

Waveform digitizing for LaBr3/NaI phoswich detector

  • The detection efficiency of phoswich detector starts to decrease when Compton scattering becomes significant. Events with energy deposit in both scintillators, if not rejected, are not useful for spectral analysis as the full energy of the incident photon cannot be reconstructed with conventional readout. We show that once the system response is carefully calibrated, the full energy of those double deposit events can be reconstructed using a waveform digitizer as the readout. Our experiment suggests that the efficiency of a photopeak at 662 keV can be increased by a factor of 2 using our LaBr3/NaI phoswich detector.
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    [1] Frontera F, Costa E, Dal Fiume D, Feroci M, Nicastro L, Orlandini M, Palazzi E, Zavattini G. Astronomy Astrophysics Supplement Series, 1997, 122: 357-369[2] Shah K S, Glodo J, Klugerman M, Moses W W, Derenzo S E, Weber M J. Nuclear Science, IEEE Transactions on, 2003, 50: 2410-2413[3] Mazumdar I, Kumar G A, Gothe D A, Manchanda R K. Nucl. Instrum. Methods A, 2010, 623: 995-998[4] Manchanda R K. Adv. Space Res., 2011, 47: 30-36[5] LI H, JI J, FENG H, ZHANG Z, HAN D. Nucl. Instrum. Methods A, 2012, 671: 24-28[6] Teegarden B J et al. The Astrophysical Journal, 2005, 621: 296-300[7] Mallozzi R S, Paciesas W S, Pendleton G N et al. The Astrophysical Journal, 1995, 454: 597-603

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SHE Rui, JI Jian-Feng, FENG Hua, LI Hong and HAN Dong. Waveform digitizing for LaBr3/NaI phoswich detector[J]. Chinese Physics C, 2014, 38(8): 086005. doi: 10.1088/1674-1137/38/8/086005
SHE Rui, JI Jian-Feng, FENG Hua, LI Hong and HAN Dong. Waveform digitizing for LaBr3/NaI phoswich detector[J]. Chinese Physics C, 2014, 38(8): 086005.  doi: 10.1088/1674-1137/38/8/086005 shu
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Received: 2013-09-04
Revised: 1900-01-01
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Waveform digitizing for LaBr3/NaI phoswich detector

    Corresponding author: JI Jian-Feng,
  • Received Date: 2013-09-04
  • Accepted Date: 1900-01-01
  • Available Online: 2014-08-05

Abstract: The detection efficiency of phoswich detector starts to decrease when Compton scattering becomes significant. Events with energy deposit in both scintillators, if not rejected, are not useful for spectral analysis as the full energy of the incident photon cannot be reconstructed with conventional readout. We show that once the system response is carefully calibrated, the full energy of those double deposit events can be reconstructed using a waveform digitizer as the readout. Our experiment suggests that the efficiency of a photopeak at 662 keV can be increased by a factor of 2 using our LaBr3/NaI phoswich detector.

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