Scintillators Based on BaF $_{2}$ With Improved Performance

The spectral-kinetic characteristics of BaF<sub>2</sub> crystals and ceramics doped with Cd, Sc, and Tm have been investigated. Some increase in intensity of an ultrafast component (I<sub>1</sub>) of radioluminescence compared to I<sub>1</sub> of the BaF<sub>2</sub> crystal has been recorded in BaF<sub>2</sub>:Sc (2.0 mol.%) ceramics annealed in an atmosphere of CF <sub>4</sub>. Significantly greater increase in I<sub>1</sub> was obtained in a BaF <sub>2</sub>:Tm (1.0 mol.%) crystal. A new mechanism explaining the growth of I<sub>1</sub> has been proposed; the transfer of energy from the excited (Tm<sup>3+</sup>)<sup>*</sup> ion to a nearby pair of Ba<sup>2+</sup> ion-interstitial ion of fluorine.

[1]  J. Ballato,et al.  Fluoride nanoscintillators , 2011 .

[2]  I. A. Mironov,et al.  Spectral-kinetic characteristics of crystals and nanoceramics based on BaF2 and BaF2: Ce , 2010 .

[3]  Y. Yokota,et al.  Evaluation of Gamma-Ray Response of Tm: ${\rm BaF} _{2}$ Single Crystals , 2010, IEEE Transactions on Nuclear Science.

[4]  Y. Yokota,et al.  Study of VUV emission and γ-ray responses of Nd:BaF2 scintillaotor , 2010 .

[5]  Y. Yokota,et al.  Crystal Growth and Luminescence Properties of Tm:BaF2 Single Crystals , 2010 .

[6]  A. Wojtowicz,et al.  Scintillation light yield of BaF2:Ce , 2009 .

[7]  I. V. Khodyuk,et al.  Location of the energy levels of the rare-earth ions in BaF2 and CdF2 , 2010, 1009.1328.

[8]  A. Myasnikova,et al.  Extrinsic luminescence of BaF2: R3+ crystals (R3+ = La3+, Y3+, Yb3+) , 2008 .

[9]  A. Ryskin,et al.  Clusters of group-III ions in activated fluorite-type crystals , 2002 .

[10]  A. N. Mishin,et al.  Small-size pulsed X-ray source for measurements of scintillator decay time constants , 2000, 2000 IEEE Nuclear Science Symposium. Conference Record (Cat. No.00CH37149).

[11]  A. Meijerink,et al.  SPIN-ALLOWED AND SPIN-FORBIDDEN 4FN4FN-15D TRANSITIONS FOR HEAVY LANTHANIDES IN FLUORIDE HOSTS , 1999 .

[12]  E. Radzhabov,et al.  Exciton luminescence suppression in BaF2–LaF3 solid solutionsDue to circumstances beyond the Publisher's control, this article appears in print without author corrections , 1998 .

[13]  P. Rodnyi,et al.  Radiative core-valence transitions in barium-based fluorides , 1991 .

[14]  N. V. Starostin,et al.  Calculation of the density of states and of the probability of optical transitions in BaF2, SrF2, and CaF2 crystals , 1991 .

[15]  R. T. Williams,et al.  The self-trapped exciton , 1990 .

[16]  P. Dorenbos,et al.  Suppression of the slow scintillation light output of BaF2 crystals by La3+ doping , 1989 .

[17]  C. Woody,et al.  Slow component suppression and radiation damage in doped BaF/sub 2/ crystals , 1989 .

[18]  R. Allemand,et al.  Barium fluoride — Inorganic scintillator for subnanosecond timing , 1983 .

[19]  P. Rodnyi,et al.  Spectral-kinetic study of the intrinsic-luminescence characteristics of a fluorite-type crystal , 1982 .

[20]  J. Pollard,et al.  The Scintillation Properties of Cadmium Fluoride , 1962 .