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 language | English (US) |
|---|---|
| Pages (from-to) | 1018-1023 |
| Number of pages | 6 |
| Journal | IEEE Transactions on Nuclear Science |
| Volume | 47 |
| Issue number | 3 PART 3 |
| State | Published - 2000 |
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ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Nuclear Energy and Engineering
Cite this
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 journal › Article
}
TY - JOUR
T1 - Chemical polishing of LSO crystals to increase light output
AU - Slates, Randal
AU - Chatziioannou, Arion
AU - Fehlberg, Brianna
AU - Lee, Taekyeung
AU - Cherry, Simon R
PY - 2000
Y1 - 2000
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=0034204882&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0034204882
VL - 47
SP - 1018
EP - 1023
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
SN - 0018-9499
IS - 3 PART 3
ER -