Improvement of Time Resolution of BaF Scintillator for Low-Energy Gamma Rays by Digital Pulse-Shape Method

A digital pulse-shape method (DPSM) is proposed to improve the time resolution of a BaF 2 scintillation detector for low-energy gamma rays. By using chi-square fitting of digitally measured pulse shapes with calculated shapes, the proposed DPSM determined the pulse height and the start time correspo...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2010-06, Vol.57 (3), p.1386-1390
Main Authors: Cho, Hwa Youn, Lee, Ju Hahn, Lee, Chun Sik
Format: Article
Language:English
Subjects:
BaF _{2} scintillator
digital signal processors
Emissions testing
Energy measurement
Energy resolution
Gamma rays
Image resolution
Pulse measurements
pulse shape method
Pulse shaping methods
Scintillation counters
Shape measurement
Signal resolution
Time measurement
time resolution
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Summary:A digital pulse-shape method (DPSM) is proposed to improve the time resolution of a BaF 2 scintillation detector for low-energy gamma rays. By using chi-square fitting of digitally measured pulse shapes with calculated shapes, the proposed DPSM determined the pulse height and the start time corresponding to the deposited energy and the interaction moment, respectively, of gamma rays incident on the BaF 2 scintillator. We calculated theoretical pulse shapes by considering light output, light-attenuation length, and light path within the scintillator. In particular, we calculated the light path inside the scintillator by using a Monte Carlo method. We performed coincidence measurements for gamma rays emitted from 22 Na and 133 Ba standard sources with two cylindrical BaF 2 scintillation detectors and then we obtained a time resolution of around 6 ns for 81-keV and 511-keV gamma rays by using the DPSM. Although time resolution obtained using the DPSM was inferior to that obtained using a conventional analog signal process, it had a consistent value irrespective of gamma-ray energy.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2009.2039759