Growth of CsI(Tl) crystals doped with Ca and Tm and investigation of its scintillation characteristics

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10.22052/6.4.29

Abstract

In this work, the growth of CsI(Tl) crystals as gamma detector was performed using vertical Bridgman method with Ca and Tm co-dopants. For evaluation of the growth crystals, X-Ray Diffraction (XRD), photoluminescence and thermoluminescence spectra as well as recorded gamma spectra were employed. In addition, the scintillation properties including energy resolution, scintillation decay time, absolute light yield, and afterglow were studied and measured. Scintillation properties of CsI(Tl) as the standard sample (Amcrys Company) and the fabricated detectors were compared. Based on the results, the light yield, energy resolutio, and decay time for CsI with Tl dopant for 661 keV are 97%, 11% and 1054 ns, respectively. The change in observed scintillation characteristics is due to creation of luminescence level and reduction of hole-trap centers by Tm, Ca codopant in CsI(Tl) structure. By Tm2+ codopant in CsI(Tl) structure, the light yield, energy resolution for 661 keV, and decay time are 103%, 9.7%, and 1373 ns, respectively. This crystal has smaller scintillation decay time and slower afterglow in comparison with CsI(Tl). Ca2+ codopant has undesirable effects on the light yield and energy resolution, while its scintillation decay time is faster and leads to higher afterglow than CsI:Tl. The light yield, energy resolution for 661 keV, and decay time are 98%, 12%, and 537 ns, correspondingly.
 

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References

[1] T. Jing, C. Goodman, J. Drewery, G. Cho, W. Hong, H. Lee, S. Kaplan, A. Mireshghi, V. Perez-Mendez and D. Wildermuth. Amorphous silicon pixel layers with cesium iodide converters for medical radiography, IEEE Trans. Nucl. Sci. 41 (1994) 903–909. [2] N. Martin. Scintillation detectors for x-rays, Meas. Sci. Technol. 17 (2006) 37–54. [3] A. Jhingan, P.Sugathan, GurpreetKaur, K. Kapoor, N.Saneesh, T. Banerjee, H. Singh, A. Kumar, B. Behera and B. Nayak. Front-end electronics for CsI based charged particle array for the study of reaction dynamics, Nuclear Instruments and Methods in Physics Research A 786 (2015) 51–58. [4] W. Carel and V. Eijk. Inorganic scintillators in medical imaging detector, Nuclear Instruments and Methods in Physics Research A 509 (2003) 17-25. [5] G.F. Knoll. Radiation Detection and Measurement, Third Edition, Wiley Inc., New York, (2000). [6] www.crystals.saint-gobain. com/sites/imdf.crystals.com /files/documents/Scintillation Arrays. sgc-array-assemblies.pdf. [7] C. Brecher, A. Lempicki, S.R. Miller, J. Glodo, E.E. Ovechkina, V. Gaysinskiy, V.V. Nagarkar and R.H. Bartram. Suppression of afterglow in CsI:Tl by codoping with Eu2+—I: Experimental, Nuclear Instruments and Methods in Physics Research A 558 (2006) 450–457. [8] E. Ovechkinaa, V. Gaysinskiya, S. Millera, C. Brecher, A. Lempickib and V. Nagarkara. Multiple doping of CsI:Tl crystals and its effect on afterglow, Radiation Measurements 42 (2007) 541–544. [9] J. Glodo, Y. Wang, R. Shawgo, C. Brecher, H. Hawrami, J. Tower and S. Shah. New Developments in Scintillators for Security Applications. Physics Procedia 90 (2017) 285–290. [10] L.A. Kappers, R.H. Bartram, D.S. Hamilton, A. Lempicki, C. Brecher, V.Gaysinskiy, E.E. Ovechkina, S. Thacker and V.V. Nagarkar. A tunneling model for afterglow suppression in CsI:Tl, Sm scintillation materials , Radiation Measurements 45 (2010) 426–428. [11] D. Totsuka, T. Yanagida, Y. Fujimoto, Y. Yokota, F. Moretti, A. Vedda and A. Yoshikawa. Afterglow Suppression by Codoping with Bi in CsI:Tl Crystal Scintillator, Applied Physics Express 5 (2012) 052601–052603. [12] Y. Wu, G. Ren, M. Nikl, X. Chen, D. Ding, S. Pana and F. Yang. CsI:Tl+,Yb2+: ultra-high light yield scintillator with reduced afterglow, 3312, Cryst Eng. Comm 16 (2014) 3312–3317. [13] Y. Wu, G. Ren, F. Meng, .X. Chen, D. Ding, H. Li, S. Pan and L. Melcher. Scintillation Characteristics of Indium Doped Cesium Iodide Single Crystal, IEEE TRANSACTIONS ON NUCLEAR SCIENCE 62 (2015) 571–576. [14] S. Singh, D. Desai, A. Singh, M.Tyagi, A. Sinha, S. Gadkari and S. Gupta. Growth of CsI:Tl crystals in carbon coated silica crucibles by the gradient freeze technique . Journal of Crystal Growth 351 (2012) 88–92. [15] A. Yoshikawa, Y. Yokota, Y. Shoji, R. Kral, K. Kamada, S. Kurosawa, Y. Ohashi, M. Arakawa, I. Chani, V. Kochurikhin, A. Yamaji, M. Andrey and M. Nikl. Development and melt growth of novel scintillating halide crystals. Optical Materials 74 (2017) 109–119. [16] http://www.amcrys.com/pdf/4281.pdf. [17] Y. Wu, G. Ren, M. Nikl, X. Chen, D. Ding, S. Pan and F. Yang. Ultralow-concentration Sm codoping in CsI:Tl scintillator: A case of little things can make a big difference, Optical Materials 38 (2014) 297–300. [18] http://www.photonis.com.
Journal of Radiation Safety and Measurement
Volume 7, Issue 4 - Serial Number 24
September 2018
Pages 29-38

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