Abstract
The energy resolution of a LaBr3(Ce) scintillation counter can reach 2.7% (662 keV) at room temperature. As a radiation measuring device, it has remarkably good characteristics. However, the LaBr3(Ce) crystal has its own intrinsic radioactivity background, which mainly comes from 138La and from 227Ac and its daughters. 138La can emit β, γ and X-rays through β and γ decay; 227Ac and its daughters can emit α, β and γ-rays through a, β and γ decay. α, β and X-ray energy are characteristic while β-ray energy is continuous. The energy of α, β and X-rays is mainly deposited in the crystal unless the α, β and X-rays at the edge of the crystal can escape from the crystal. Therefore, the α, β, γ and X-rays generated by the intrinsic radioactivity of the crystal are superimposed on the instrument spectrum, which makes the instrument spectrum more complicated and produces the coincidence summing effects of γ + X, γ + β and γ + α.In this research, the GEANT4.9.5 software package was used to simulate the spectra of α, β, γ and X-rays. On the basis of a combination of fitting decomposition and reconstruction, the simulation spectrum of the LaBr3(Ce) self-radioactive background was obtained accurately and was verified by using physical experiments.
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References
M. Bashir et al., Appl. Radiat. Isot. 154, 108880 (2019).
E. Yoshida et al., Nucl. Instrum. Methods Phys. Res. A 604, 363 (2009).
E. Prieto et al., Radiat. Phys. Chem. 168, 108600 (2020).
P.F. Bloser et al., Nucl. Instrum. Methods Phys. Res. A 763, 26 (2014).
K. Smith et al., Nucl. Instrum. Methods Phys. Res. B 414, 190 (2018).
J. Jeon et al., Nucl. Instrum. Methods Phys. Res. A 954, 162302 (2020).
A. Lavagno et al., Nucl. Instrum. Methods Phys. Res. A 718, 504 (2013).
D. Arnold et al., Appl. Radiat. Isot. 64, 1297 (2006).
F. Quarati et al., Nucl. Instrum. Methods Phys. Res. A 574, 115 (2007).
P. Mekarski et al., Appl. Radiat. Isot. 67, 1957 (2009).
K. Breitenecker et al., Appl. Radiat. Isot. 67, 2088 (2009).
F. C. L. Crespi et al., Nucl. Instrum. Methods Phys. Res. A 602, 520 (2009).
F. G. A. Quarati et al., Nucl. Instrum. Methods Phys. Res. A 683, 46 (2012).
R. Nicolini et al., Nucl. Instrum. Methods Phys. Res. A 582, 554 (2007).
W. Wolszczak et al., Nucl. Instrum. Methods Phys. Res. A 857, 66 (2017).
H. Negm et al., in ANIMMA (June, 2013), pp. 1–5.
A. A. Sonzogni et al., Nucl. Data Sheets 98, 515 (2003).
R. Sandler et al., Phys. Rev. C 100, 014308 (2019).
R. Bernabei et al., Nucl. Instrum. Methods Phys. Res. A 555, 270 (2005).
A. Camp et al., Appl. Radiat. Isot. 109, 512 (2016).
B. Milbrath et al., Nucl. Instrum. Methods Phys. Res. A 547, 504 (2005).
M. Kohler et al., Appl. Radiat. Isot. 52, 717 (2000).
E. L. Roy et al., Mar.Chem. 212, 64 (2019).
W. Geibert et al., Mar.Chem. 109, 238 (2008).
T. J. Shaw et al., Mar.Chem. 78, 197 (2002).
Y. Nozaki et al., Geophys. Res. Lett. 17, 1933 (1990).
Y. Lu et al., Nucl. Instrum. Methods Phys. Res. A 969, 164014 (2020).
K. E. Mesick et al., Nucl. Instrum. Methods Phys. Res. A 5, 31072 (2016).
M. N. Cinti et al., Nucl. Instrum. Methods Phys. Res. A 724, 27 (2013).
J. K. Hartwell et al., Appl. Radiat. Isot. 63, 223 (2005).
W. J. Kernan, IEEE Trans. Nucl. Sci. 53, 395 (2006).
W. M. Higgins et al., J. Cryst. Growth 287, 239 (2006).
Davood Alizadeh et al., Nucl. Instrum. Methods Phys. Res. A 915, 1 (2019).
S. Ashrafi et al., Open Phys. 11, 560 (2013).
Y. Zhang et al., Math. Probl. Eng. 38, 931256 (2015).
Acknowledgments
The authors would like to thank the reviewers whose comments greatly improved the quality of the manuscript. This research was supported by the National Science Foundation of China (Project No.41774147), National Science Foundation of China (Project No.11905020) and the National Key R&D Program of China (Project No.2017YFC0602105).
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Sun, S., Ge, L., Li, Y. et al. Study on the γ + X, γ + β, γ + α Coincidence Summing Effects of the Intrinsic Background Instrument Spectrum of a LaBr3(Ce) Scintillation Counter. J. Korean Phys. Soc. 77, 1091–1099 (2020). https://doi.org/10.3938/jkps.77.1091
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DOI: https://doi.org/10.3938/jkps.77.1091