Symmetric analog positron lifetime spectrometer utilizing charge-to-digital converters

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• 作者：N. Djourelov ; N. Charvin ; C. Bas ; J. Viret ; V. Samoylenko ; D. Sillou
• 关键词：Positron annihilation ; γ ; -Ray backscattering ; Pileup
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2007
• 出版时间：November 2007
• 年：2007
• 卷：264
• 期：1
• 页码：165-170
• 全文大小：375 K

文摘

A symmetric positron annihilation lifetime (PAL) spectrometer using a charge-to-digital converters was designed. It is based on a coincidence circuit for the trigger and recording of the timing and the charge of the pulses of two scintillation detectors. The off-line data processing allows a detailed study of the spectrometer performance in function of the width of the digital charge discriminator windows for acceptance of the pulses as starts and stops. Some technical problems when working with BaF₂ scintillators were solved. The parasitic effect of the pileup and backscattered γ-rays on the PAL spectrum is discussed.