Optics.org
daily coverage of the optics & photonics industry and the markets that it serves
Featured Showcases
Photonics West Showcase
Optics+Photonics Showcase
Products
Menu
Product Announcement

Ce BaF2 Scintillator Crystal

13 Aug 2019

Description

Ce:BaF2 Scintillator Crystal— A reasonably fast and rugged scintillator

BaF2 has a decay time of less than 1 ns, which makes it unique among the high-Z scintillators and consequently very attractive for many applications where good timing is important.  BaF2 has a low refractive index of about 1.478 at a wavelength of 500 nm and can be relatively easily matched with a proper polymeric matrix. Moreover, BaF2’s conversion of light for ionising radiation is quite linear with energy. However, the integrated intensity of the fast component is low and the emission spectrum of BaF2 contains an exciton band with undesirably long decay time. This problem can be solved by the introduction of an activator, which transforms the exciton emission into the faster activator luminescence. Trivalent cerium has been became a natural choice for the activator, because the Ce3+ ion has a fairly short decay time. Ce:BaF2 scintillator is a well-known, reasonably fast and efficient scintillator characterized by a decent stopping power and availability of large size crystals. Bulk single crystalline  Ce:BaF2 have been used as traditional scintillators for gamma ray detection.

BaF2, the fastest known scintillator, is a very attractive material for γ-ray detection and light charged particles.The BaF2 doped with rare earth ions, such as the Ce3+ ion, can suppress the slow components. Ce:BaF2, a reasonably fast, efficient and rugged scintillator characterized by a reasonable stopping power, good matching refraction index and availability of large size crystals, was first proposed in 1977 as a substitute for BaF2, which it is also the most efficient of all the rare-earth-doped alkaline earth fluorides.

Parameter

Chemical formula Ce:BaF2
Density (g/cm3) 4.893
Melting point (℃) 1386
Hardness (Mho) 3
Hygroscopic slightly
Cleavage  
Lattice Constant (nm) 0.6196
Solubility(g/100gH2O) 0.17
Thermal expansion coeff (C-1) 18.4*10-6
Thermal conductivity coeff (W/mk)

11.72

Wavelength (Max. Emission) (nm) 310
Wavelength range(nm) 170-460
Decay time(ns) 630(slow);0.87/0.88(fast)
Light yield(photons/keV) 10(slow);1.9(fast)
Refractive index 1.49@310nm
Radiation length(cm) 2.026
Optical transmission(um) 0.15-12.5
Transmittance(%) >90(0.35-9um)
Reflection loss/surface(%) 6.8
Lattice constant(nm) 0.6196
Afterglow (after 3ms) (%) 0.005
Light output relative to Nal(Tl) (%) 20(slow),4(fast)

Feature

  • Non-hygroscopic
  • Linear conversion of light
  • Chemically stable
  • Quite short decay time
  • Fast time response
  • Reasonable stopping power
  • Good matching refraction index

Application

  • γ-ray detection
  • Light charged particles identification
  • Charged particle detector
  • Detectors for ionising radiation
  • Optical amplifiers
  • X-ray imaging
  • Radiation scintillation

CONTACT DETAILS
Nanjing Crylink Photonics Co.,Ltd
No.3, Hengda Road, Economic and Technological Development Zone, Nanjing, China
No.200,Zhaoxian Road,Jiading District,Shanghai City
Nanjing
Jiangsu
210038
China
Tel: (86)025-68790684
Fax: (86)025-68790685
Email Us
Web Site
© 2024 SPIE Europe
Top of Page