The influence of radiation on Ps formation in PE studied by coincidence Doppler-broadening spectroscopy

被引：12
|
作者：
Suzuki, T [1 ]
He, CQ
Kondo, K
Shantarovich, V
Ito, Y
机构：
[1] High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan
[2] Russian Acad Sci, Inst Chem Phys, Moscow 117334, Russia
[3] Univ Tokyo, RCNT, JAERI, Tokai, Ibaraki 3191106, Japan
来源：
RADIATION PHYSICS AND CHEMISTRY | 2003年 / 68卷 / 3-4期
关键词：
positron annihilation; Doppler broadening; coincidence Doppler experiment; polyethylene; radiation effect; oxygen effect; carbonyl group;
D O I：
10.1016/S0969-806X(03)00214-7
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The high-resolution Doppler-broadening spectroscopy of positron-annihilaion gamma rays emitted during an experiment on positron annihilation lifetime spectroscopy (PALS) has been applied to study the radiation and oxygen effects on positronium (Ps) formation in polyethylene (PE). Using two Ge detectors, the DB spectra were obtained by measuring the coincidences of two photons. While the Ps formation rate decreased with elapsed time during the PALS experiment, the increase of annihilation on oxygen-containing groups was monitored by coincidence Doppler-broadening spectroscopy (CDBS). This suggested that the decrease in Ps formation was associated with the carbonyl groups (-C = O) formed by radiation emitted from the positron sources. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：489 / 492
页数：4
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