Temperature dependence of positron annihilation lifetime spectra for polyethylene: positron irradiation effects

Authors
Hsu, FH Choi, YJ Hadley, JH
Citation
Fh. Hsu et al., Temperature dependence of positron annihilation lifetime spectra for polyethylene: positron irradiation effects, RADIAT PH C, 58(5-6), 2000, pp. 473-477
Citations number
16
Categorie Soggetti
Physics
Journal title
RADIATION PHYSICS AND CHEMISTRY
ISSN journal
0969806X → ACNP
Volume
58
Issue
5-6
Year of publication
2000
Pages
473 - 477
Database
ISI
SICI code
0969-806X(200006)58:5-6<473:TDOPAL>2.0.ZU;2-I
Abstract
Lifetime spectra for linear and branched polyethylene have been measured as a function of temperature. The longest lifetime, tau(3), and its intensity , I-3, are traced over a temperature range of 105-370 K. The lifetime decre ases with decreasing temperature, and upon reheating the plot is retraced. I-3 has a minimum near 265 K with considerable hysteresis in the cooling/he ating cycle. At the lower temperatures the increase in I-3 is attributed to source irradiation. (C) 2000 Elsevier Science Ltd. All rights reserved.