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arXiv 1207.4902physics.ins-dethep-ex
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读出积分时间对闪烁晶体能量分辨率的影响

Dependence of the energy resolution of a scintillating crystal on the readout integration time

V. Bocci, D. Chao, G. Chiodi, R. Faccini, F. Ferroni, R. Lunadei, G. Martellotti, G. Penso, D. Pinci, L. Recchia

摘要:

研究了用慢闪烁晶体进行高速量热的可能性。在这种实验情况下,为了避免脉冲堆积,可能需要将能量测量仅基于发射光的一小部分,从而破坏能量分辨率。通过测量信号的峰值幅度,用BGO晶体和光电倍增管以及随后的积分器对这种效应进行了实验研究。实验数据表明,能量分辨率完全是由于光电子数量的统计波动的峰值振幅。当这个数字很小时,它的波动甚至比泊松统计预测的更小。这些结果证实了蒙特卡罗模拟,它允许估计,在一般情况下,能量分辨率,给定的光电子的总数,闪烁时间和积分时间。

英文摘要:

The possibilty of performing high-rate calorimetry with a slow scintillator crystal is studied. In this experimental situation, to avoid pulse pile-up, it can be necessary to base the energy measurement on only a fraction of the emitted light, thus spoiling the energy resolution. This effect was experimentally studied with a BGO crystal and a photomultiplier followed by an integrator, by measuring the peak amplitude of the signals. The experimental data show that the energy resolution is exclusively due to the statistical fluctuations of the number of photoelectrons contributing to the peak amplitude. When such number is small its fluctuations are even smaller than those predicted by Poisson statistics. These results were confirmed by a Monte Carlo simulation which allows to estimate, in a general case, the energy resolution, given the total number of photoelectrons, the scintillation time and the integration time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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