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High Precision Measurements of Crystal Light Yield: Analysis of Anomalous FNUF Crystals

This study conducted in February 2002 at Imperial College delves into the in-depth analysis of crystal properties with data from ACCOS and NUF measurements on specific Co60 source crystals. The research identifies correlations between FNUF values and GradRS parameters, showcasing sudden changes in transverse transmission slopes among anomalous crystals. 8

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High Precision Measurements of Crystal Light Yield: Analysis of Anomalous FNUF Crystals

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  1. Endcap Crystal Properties David Britton, Imperial College, February 2002 ACCOS Data for the 2001 crystals (2369-2467)

  2. Precision NUF Measurements Data from 18 of the 2001 Crystals Co60 Source Crystal HPMT

  3. Transmission Measurements 4 Crystals setup for Longitudinal measurement Integrating Sphere Typical Transverse Transmission Curves at 350nm for two different crystals “R-slope” “F-slope” Spectrometer (CCD array) Xe Lamp beam

  4. R-Slopes Vs Wavelength Crystal 2386 (FNUF = 0.55%/X0) (Typical of normal FNUF crystals) “GradRS” Crystal 2379 (FNUF = 1.03%/X0) (Typical of high FNUF crystals)

  5. Correlation between NUF and GradRS Conclusions ACCOS light yield data are supported by higher precision measurements. A correlation exists between FNUF and the transverse transmission (either the GradTT or GradRS parameters). The anomalous FNUF crystals show a sudden change in the slope of the TT between 350nm and 380nm.

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