Chemical polishing of LSO crystals to increase light output

Randal Slates, Arion Chatziioannou, Brianna Fehlberg, Taekyeung Lee, Simon R Cherry

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Surface treatment of scintillators is critical for light collection from narrow rectangular crystals. We investigated chemical polishing which is less labor intensive and expensive than hand and machine polishing. We used phosphoric acid to chemically polish LSO crystals at 110°C, 150°C and 190°C, and compared these with unpolished and mechanically polished crystals. Groups of five 2x2x10 mm crystals were etched for different times at each temperature. Weight loss, light output and energy resolution were measured as a function of treatment time and temperature. We found that chemical polishing can increase light output by 250% relative to unpolished crystals and by 16% relative to mechanically polished crystals. The energy resolution was relatively independent of surface treatment, with values of between 14 and 16%. The rate of loss of LSO was 0.02%/min at 110°C, 0.1%/min at 150"C and0.36%/min at 190°C. Maximum light output occurred when 5-10% of the LSO was removed. The crystals were also imaged using scanning electron microscopy and the surface roughness quantitatively assessed by using a profilometer. These measurements helped to clarify the effect of acid polishing on the surface of the scintillator. In summary, chemical polishing appears to be a convenient and effective method for improving light output from small LSO crystals.

Original languageEnglish (US)
Pages (from-to)1018-1023
Number of pages6
JournalIEEE Transactions on Nuclear Science
Volume47
Issue number3 PART 3
StatePublished - 2000

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Chemical polishing
polishing
Crystals
output
crystals
surface treatment
Phosphors
scintillation counters
Surface treatment
Polishing machines
profilometers
labor
phosphoric acid
Phosphoric acid
Polishing
surface roughness
Surface roughness
Personnel
Temperature
Scanning electron microscopy

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Nuclear Energy and Engineering

Cite this

Slates, R., Chatziioannou, A., Fehlberg, B., Lee, T., & Cherry, S. R. (2000). Chemical polishing of LSO crystals to increase light output. IEEE Transactions on Nuclear Science, 47(3 PART 3), 1018-1023.

Chemical polishing of LSO crystals to increase light output. / Slates, Randal; Chatziioannou, Arion; Fehlberg, Brianna; Lee, Taekyeung; Cherry, Simon R.

In: IEEE Transactions on Nuclear Science, Vol. 47, No. 3 PART 3, 2000, p. 1018-1023.

Research output: Contribution to journalArticle

Slates, R, Chatziioannou, A, Fehlberg, B, Lee, T & Cherry, SR 2000, 'Chemical polishing of LSO crystals to increase light output', IEEE Transactions on Nuclear Science, vol. 47, no. 3 PART 3, pp. 1018-1023.
Slates R, Chatziioannou A, Fehlberg B, Lee T, Cherry SR. Chemical polishing of LSO crystals to increase light output. IEEE Transactions on Nuclear Science. 2000;47(3 PART 3):1018-1023.
Slates, Randal ; Chatziioannou, Arion ; Fehlberg, Brianna ; Lee, Taekyeung ; Cherry, Simon R. / Chemical polishing of LSO crystals to increase light output. In: IEEE Transactions on Nuclear Science. 2000 ; Vol. 47, No. 3 PART 3. pp. 1018-1023.
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