Intrinsic background radiation of LaBr 3 (Ce) detector via coincidence measurements and simulations
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Intrinsic background radiation of LaBr3(Ce) detector via coincidence measurements and simulations Hao Cheng1,2,3 • Bao-Hua Sun1,2 • Li-Hua Zhu1,2 • Tian-Xiao Li3 Guang-Shuai Li1 • Cong-Bo Li3 • Xiao-Guang Wu3 • Yun Zheng3
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Received: 11 July 2020 / Revised: 20 August 2020 / Accepted: 22 August 2020 / Published online: 9 October 2020 China Science Publishing & Media Ltd. (Science Press), Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Chinese Nuclear Society and Springer Nature Singapore Pte Ltd. 2020
Abstract The LaBr3(Ce) detector has attracted much attention in recent years because of its superior characteristics compared with other scintillating materials in terms of resolution and efficiency. However, it has a relatively high intrinsic background radiation because of the naturally occurring radioisotopes in lanthanum, actinium, and their daughter nuclei. This limits its applications in low-counting rate experiments. In this study, we identified the radioactive isotopes in the /300 300 Saint-Gobain B380 detector by a coincidence measurement using a Clover detector in a low-background shielding system. Moreover, we carried out a Geant4 simulation of the experimental spectra to evaluate the activities of the main internal radiation components. The total activity of the background radiation of B380 is determined to be 1.523 (34) Bq/cm3. The main sources include 138La at 1.428 (34) Bq/cm3, 207Tl at 0.0135 (13) Bq/cm3, 211Bi at 0.0136 (15) Bq/cm3, 215Po at 0.0135 (3) Bq/cm3, 219Rn at 0.0125 (12) Bq/cm3, 223Fr at 0.0019
This work was supported by the National Key R & D program of China (No. 2016YFA0400504) and by the National Natural Science Foundation of China (Nos. U1832211, U1867210, 11922501, 11961141004, 11575018, 11790322, and U1932209). & Bao-Hua Sun [email protected] Li-Hua Zhu [email protected] 1
School of Physics, Beihang University, Beijing 100191, China
2
Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Medicine and Engineering, Beihang University, Beijing 100191, China
3
China Institute of Atomic Energy, Beijing 102413, China
(11) Bq/cm3, 223Ra at 0.0127 (10) Bq/cm3, 227Th at 0.0158 (22) Bq/cm3, and 227Ac at 0.0135 (13) Bq/cm3. Of these, the activities of 207Tl, 211Po, 215Po, 223Fr, and 227Ac are deduced for the first time from the secular equilibrium established in the decay chain of 227Ac. Keywords LaBr3 Coincidence measurement technique Intrinsic radiation GEANT4 simulation
1 Introduction As a new type of inorganic scintillator, the LaBr3(Ce) crystal has a high density of 5.08 g/cm3, a high light output of approximately 63 photons/keV c, a fast decay time of approximately 16 ns [1], and a good temperature response. These superior characteristics make LaBr3(Ce) ideal for many applications [2–6] in environmental monitoring, oil well logging, nuclear safeguards, and medical imaging. Thus, LaBr3(Ce) is often used as a substitute for the widely used NaI(TI) crystal when high performance is required. The integrated LaBr3(Ce) detec
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