LaBr $_3$（Ce）探测器本征辐射本底的符合测量和模拟
Intrinsic radiation background of LaBr$_3$(Ce) detector via coincidence measurements and simulations
摘要：
LaBr $_3$（Ce）探测器因其在分辨率和效率方面优于其他掺杂材料而受到广泛关注。然而，由于镧、锕及其子核中天然存在的放射性同位素，它具有相对较高的固有辐射背景。这限制了它在低计数率实验中的应用。在低本底屏蔽系统中，采用Clover探测器对圣戈班B380探测器中的放射性同位素进行符合测量，从而鉴别出$\phi3''\times 3''$的放射性同位素。此外，我们进行了Geant 4模拟的实验光谱，以评估的主要内辐射成分的活动。%，由$^{138}$ La和$^{227}$ Ac的$α$、$γ$和$β$衰变。测定B_（380）的本底放射性活度为1.480（69）Bq/cm $^3$，其主要来源包括：$^{138}$ La为1.425（59）Bq/cm $^3$，$^{211}$ Bi为0.0136（15）Bq/cm $^3$，$^{219}$ Rn为0.0125（17）Bq/cm $^3$，0.0127（14）Bq/cm $^3$的$^{223}$ Ra和0.0158（22）Bq/cm $^3$的$^{227}$ Th。
英文摘要：
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$^3$.
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