论文标题
LABR的固有辐射背景$ _3 $（CE）检测器通过巧合测量和模拟
Intrinsic radiation background of LaBr$_3$(Ce) detector via coincidence measurements and simulations
论文作者
论文摘要
近年来，LABR $ _3 $（CE）检测器在分辨率和效率方面吸引了其与其他闪烁材料的卓越特征有关。但是，由于灯笼，阳离子及其女儿核的天然放射性同位素，它具有相对较高的固有辐射背景。这限制了其在低计数率实验中的应用。在本文中，我们通过在低背景屏蔽系统中使用三叶草探测器进行巧合测量来确定$ \ phi3''\ times 3''$ Saint-Gobain B380检测器中的放射性同位素。此外，我们对实验光谱进行了GEANT4模拟，以评估主要内部辐射组件的活性。 ％通过$α$，$γ$和$β$从$^{138} $ la和$^{227} $ ac衰减的％。 B380的辐射背景的活动被确定为1.480（69）bq/cm $^3 $，其主要来源包括$^{138} $ LA，1.425（59）bq/cm $^3 $，$^{211} $ of 0.0136（15）bq/cm $^3 $^3 $^3 $^3 $^3 $^3 $^3199。 bq/cm $^3 $，$^{223} $ ra为0.0127（14）bq/cm $^3 $，$^{227} $ th of 0.0158（22）bq/cm $^3 $。
The LaBr$_3$(Ce) detector has attracted much attention in recent years for its superior characteristics to other scintillating materials in terms of resolution and efficiency. However, it has relatively high intrinsic radiation background due to the naturally occurring radioisotope in lanthanum, actinium and their daughter nuclei. This limits its applications in low counting rate experiments. In this paper, we identified the radioactive isotopes in the $\phi3''\times 3''$ 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 to the experimental spectra to evaluate the activities of the main internal radiation components. % by means of the $α$, $γ$ and $β$ decays from the $^{138}$La and $^{227}$Ac. The activity of radiation background of B380 is determined to be 1.480 (69) Bq/cm$^3$, the main sources of which include $^{138}$La of 1.425 (59) Bq/cm$^3$, $^{211}$Bi of 0.0136 (15) Bq/cm$^3$, $^{219}$Rn of 0.0125 (17) Bq/cm$^3$, $^{223}$Ra of 0.0127 (14) Bq/cm$^3$, and $^{227}$Th of 0.0158 (22) Bq/cm$^3$.
