Tl:Csl,Na:Csl,Csl
TI:CsI, Na:CsI,CsI Scintillator Crystals
TI:CsI is one of the brightest scintillators. It has most of its emission in the long wavelength part of the spectrum (>500nm), it is well-suited for photodiode readout. TI:CsI crystal has high light yield, no cleavage surface, low melting point and easy growth. It has good optical properties, mechanical properties, physical and chemical stability and high photoelectric conversion efficiency. It is a scintillator with excellent comprehensive performance. It has been widely used in many fields, such as Security check, Detection of neutrinos, Detection of neutrinos andγ-ray, XCT.
Pure CsI is also known as a scintillator but exhibits rather different properties. It exhibits fast (~10 ns) emission, peaking at 310 nm, but its scintillation yield at room temperature is very low. But its light yield at 77 K reaches an impressive 100,000 ph/MeV, that makes pure CsI a very attractive scintillator for detector applications at low temperatures.
Na-doped cesium iodide (Na:CsI) is an important alkali metal halide inorganic scintillator that is widely used as laser-stimulable transparent film and X-ray detection materials. Na:CsI has peaking emission at 420 nm, and its decay time is about 630 ns.As an inorganic scintillator, Na:CsI has relatively high luminescence intensity and effective atomic number compared to organic scintillator. Recently, it is found that Na:CsI is a promising suitable detection material for dark matter scientific exploration.
Parameter
Chemical formula | TI:CsI | Na:CsI | CsI |
Density (g/cm3) | 4.51 | 4.51 | 4.51 |
Melting point (℃) | 894 | 621 | 894 |
Hardness (Mho) | 2 | 2 | 2 |
Hygroscopic | Slightly | Yes | Slightly |
Cleavage | No | No | No |
Solubility (g/100gH2O) | N/A | N/A | / |
Thermal expansion coeff (C-1) | 54*10-6 | 54*10-6 | 54*10-6 |
Chemical formula | TI:CsI | Na:CsI | CsI |
Wavelength(Max. emission) (nm) | 550 | 420 | 315 |
Wavelength range (nm) | 320- | 300- | 260- |
Decay time (ns) | 900 | 300 | 16 |
Light yield (photons/keV) | 54 | 41 | 2 |
Light output relative to Nal(Tl) (%) | 45 | 85 | 5 |
Refractive index | 1.8@550nm | 1.84 (@420nm) | 1.95 |
Radiation length (cm) | 1.86 | 1.86 | 1.86 |
Optical transmission (um) | TBA | TBA | / |
Transmittance (%) | TBA | TBA | / |
Reflection loss/surface (%) | TBA | TBA | / |
Neutron Capture Cross-section (barns) | 1.47 | TBA | / |
Afterglow (%) | 0.5-5.0 | 0.5-5.0 | / |
CsI emission spectrum | CsI decay time |
CsI X-ray radioluminscence spectrum | Na-CsI emission spectrum |
Na-CsI response waveform | Na-CsI transmission spectrum |
TI-CsI Emission spectrum | TI-CsI Transmission spectrum |
- Matched with silicon photodiodes
- High light yield
- Low melting point
- Easy growth
- Good optical and mechanical properties
- Good physical and chemical stability
- High photoelectric conversion efficiency
- Security check
- Detection of neutrinos
- Detection of neutrinos γ-ray
- XCT
- PET
- Position sensitive detector
- Geological exploration
- Industrial CT camera
[1] Gruber G J , Moses W W , Derenzo S E , et al. A discrete scintillation camera module using silicon photodiode readout of CsI(TI) crystals for breast cancer imaging[J]. IEEE Transactions on Nuclear Science, 1998, 45(3):1063-1068. |
[2] Nagirnyi V , Zazubovich S , Zepelin V , et al. A new model for the visible emission of the CsI: Tl crystal[J]. Chemical Physics Letters, 1994, 227(4-5):533-538. |
[3] Ioannis, Valais, and, et al. A systematic study of the performance of the CsI:Tl single-crystal scintillator under X-ray excitation[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007, 571(1-2):343-345. |
[4] S Pécourt, Chambon B , MD Jésus, et al. Calibration of a CsI(Tl) crystal with nuclear recoils and pulse shape measurements for dark matter detection[J]. Astroparticle Physics, 1999, 11(4):457-462. |
[5] Sokolov V O , Plotnichenko V G , Dianov E M . Centers of near-IR luminescence in bismuth-doped TlCl and CsI crystals[J]. Optics Express, 2013, 21(8):9324-9332. |
[6] Bozorgnia N , Gelmini G B , Gondolo P . Channeling in direct dark matter detection III: channeling fraction in CsI crystals[J]. Journal of Cosmology & Astroparticle Physics, 2010, 11(11). |
[7] Hamada, Margarida, M, et al. Dependence of Scintillation Characteristics in the CsI(Tl) Crystal on Tl[sup+] Concentrations Under Electron and Alpha Particles Excitations.[J]. IEEE Transactions on Nuclear Science, 2001, 48(4):1148-1148. |
[8] Kim H J , Lee H S , Bhang H C , et al. Development of low background CsI(Tl) crystals and search for WIMP[J]. IEEE Transactions on Nuclear Science, 2008, 55(3):1420-1424. |
[9] First limit on WIMP cross section with low background crystal detector[J]. Physics Letters B, 2006. |
[10] Grassmann H , Moser H G , Dietl H , et al. Improvements in photodiode readout for small CsI(Tl) crystals[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1985, 234(1):122-124. |
[11] Deich R , Karklina M , Nagli L . Intraband luminescence of CsI crystal[J]. Solid State Communications, 1989, 71(10):859-862. |
[12] Aiello S , Anzalone A , Cardella G , et al. Light response and particle identification with large CsI(TI) crystals coupled to photodiodes[J]. Nuclear Instruments & Methods in Physics Research, 1998, 369(1):50-54. |
[13] Lee H S , Li Y J , Li J , et al. Limits on WIMP-nucleon cross section with CsI(Tl) crystal detectors[J]. Phys.rev.lett, 2007. |
[14] H. S , Bhang, H. C , et al. Limits on WIMP-nucleon interactions with CsI(Tl) crystal detectors. |
[15] Babin V , Kalder K , Krasnikov A , et al. Luminescence and defects creation under photoexcitation of CsI:Tl crystals in Tl+-related absorption bands[J]. Journal of Luminescence, 2002, 96(1):75-85. |
[16] Seo H J , Zhang W S , Tsuboi T , et al. Luminescence properties of a CsI crystal doped with EU2+ ions[J]. Journal of Alloys & Compounds, 2002, 344(1-2):268-271. |
[17] Su L , Zhao H , Li H , et al. Near-infrared photoluminescence spectra in Bi-doped CsI crystal: evidence for Bi-valence conversions and Bi ion aggregation[J]. Optical Materials Express, 2012, 2(6):757-764. |
[18] Su L , Zhao H , Li H , et al. Near-infrared ultrabroadband luminescence spectra properties of subvalent bismuth in CsI halide crystals[J]. Optics Letters, 2011, 36(23):4551-3. |
[19] Neutron beam test of CsI crystal for dark matter search.[J]. Nuclear Instruments & Methods in Physics Research Section A, 2002, 491(3):460-460. |
[20] Nagirnyi V , Stolovich A , Zazubovich S , et al. Peculiarities of the triplet relaxed excited-state structure and luminescence of a CsI:Tl crystal[J]. Journal of Physics Condensed Matter, 1995, 7(18):3637. |
[21] Ruo-Fu C , Hu-Shan X , F Rui-Rui, et al. Property measurement of the CsI(Tl) crystal prepared at IMP[J]. Chinese Physics C, 2008, 32(2):135. |
[22] Tasman H A , Boswijk K H . Re-investigation of the crystal structure of CsI 3[J]. Acta Crystallographica, 2010, 8(12):857-857. |
[23] Trefilova L N , Kudin A M , Kovaleva L V , et al. Role of sodium in radiation defect formation in CsI crystals[J]. Radiation Measurements, 2001, 33(5):687-692. |
[24] Schotanus P , Kamermans R . Scintillation characteristics of pure and Tl-doped CsI crystals[J]. IEEE.TRANS.NUCL.SCIENCE, 1990, 37(2):177-182. |
[25] Lee H S , Bhang H , Choi J H , et al. Search for Low-Mass Dark Matter with CsI(Tl) Crystal Detectors[J]. Physical Review D, 2014, 90(5):36-47. |
[26] Klamra W , Balcerzyk M , Kapusta M , et al. Studies of scintillation light nonproportionality of ZnSe(Te), CsI(Tl) and YAP(Ce) crystals using heavy ions[J]. Nuclear Inst & Methods in Physics Research A, 2002, 484(1-3):327-332. |
[27] Kim T Y , Cho I S , D H Choi, et al. Study of the internal background of CsI(T) crystal detectors for dark matter search[J]. Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, 2003, 500(1-3):p. 337-344. |
[28] Havinga E E , Boswijk K H , Wiebenga E H . The crystal structure of Cs2I8(CsI4)[J]. Acta Crystallographica, 1954, 7(6-7):487–490. |
[29] Ha S J , Kang H , Park H , et al. The Growth and Scintillation Characteristics of CsI:CO Single Crystals[J]. IEEE Transactions on Nuclear Science, 2009, 56(3):998-1001. |