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Development of an on-line scintillation flow-cell detection system with pulse shape discrimination for quantification of actinides

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2 Author(s)
T. A. DeVol ; Clemson Univ., SC, USA ; R. A. Field

A flow-cell detection system was developed utilizing pulse shape discrimination as a means of reducing the beta (gamma-ray) background when quantifying alpha emitters. Flow-cells consisting of 63-90 μm particles of CaF2:Eu, scintillating glass (GS-20), and BaF 2 were each packed into translucent Teflon tubing. CaF2 :Eu and GS-20 exhibited only marginal pulse shape resolution, achieving figures of merit, (FOM) of 0.46 and 0.27, respectively. BaF 2 exhibited reasonable pulse shape resolution, FOM=0.75. Unfortunately, the presence of intrinsic alpha emitters in CaF2 :Eu and BaF2 resulted in an elevated background count rate in the alpha window. Coupled with a detection efficiency of ~50% for 233U (Eα=4.8 MeV) alpha particles, minimum detectable activities at the optimal pulse shape time discriminator setting were 0.6 Bq for CaFa2:Eu and BaF2 and 1.1 Bq for GS-20

Published in:

IEEE Transactions on Nuclear Science  (Volume:42 ,  Issue: 4 )