Scintillation properties of Nd super(3+), Tm super(3+), and Er super(3+) doped LuF sub(3) scintillators in the vacuum ultra violet region

In order to develop novel vacuum ultra violet (VUV) emitting scintillators, we grew Nd 0.5%, Tm 0.5%, and Er 0.5% doped LuF sub(3) scintillators by the mu -pulling down method, because LuF sub(3) has a very wide band gap and Nd super(3+), Tm super(3+), and Er super(3+) luminescence centers show fast...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2011-12, Vol.659 (1), p.258-261
Main Authors: Yanagida, Takayuki, Kawaguchi, Noriaki, Fukuda, Kentaro, Kurosawa, Shunsuke, Fujimoto, Yutaka, Futami, Yoshisuke, Yokota, Yuui, Taniue, Kojiro, Sekiya, Hiroyuki, Kubo, Hidetoshi, Yoshikawa, Akira, Tanimori, Toru
Format: Article
Language:English
Subjects:
Decay
Emission
Neodymium
Scintillation
Spectrometers
Transmittance
X-rays
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Summary:In order to develop novel vacuum ultra violet (VUV) emitting scintillators, we grew Nd 0.5%, Tm 0.5%, and Er 0.5% doped LuF sub(3) scintillators by the mu -pulling down method, because LuF sub(3) has a very wide band gap and Nd super(3+), Tm super(3+), and Er super(3+) luminescence centers show fast and intense 5d-4f emission in VUV region. Transmittance and X-ray induced radioluminescence were studied in these three samples using our original spectrometer made by Bunkou-Keiki company. In the VUV region, transmittance of 20-60% was achieved for all the samples. The emission peaks appeared at approximately 180, 165, and 164 nm for Nd super(3+), Tm super(3+), and Er super(3+) doped LuF sub(3), respectively. Using PMT R8778 (Hamamatsu), we measured their light yields under super(241)Am alpha -ray excitation. Compared with Nd:LaF sub(3) scintillator, which has 33 photoelectrons/5.5 MeV alpha , Nd:LuF sub(3) and Tm:LuF sub(3) showed 900+/-90 and 170+/-20 ph/5.5 MeV- alpha , respectively. Only for the Nd doped one, we can detect super(137)Cs 662 keV gamma -ray photoabsorption peak and the light yield of 1200+/-120 ph/MeV was measured. We also investigated their decay time profiles by picosecond pulse X-ray equipped streak camera, and the main decay component of Nd:LuF sub(3) turned out to be 7.63 ns.
ISSN:0168-9002
DOI:10.1016/j.nima.2011.08.056