Development of a method for positron annihilation lifetime measurement in thin polyethylene films using a Na-22 source
Open Access
- 1 November 2020
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 59 (11), 116504
- https://doi.org/10.35848/1347-4065/abc02e
Abstract
Positron annihilation lifetime measurements were performed on polyethylene films [low-density polyethylene and ultra-high molecular weight polyethylene (UHMWPE)] with a thickness of 15–2000 μm using a Na-22 positron source enclosed in a Kapton film. For thin films, some positrons will pass through the film and annihilate behind it. Using a single film in a commercial anti-coincidence system, by placing an annealed stainless steel (SUS304) cover behind the sample, it is possible to sufficiently measure the long-lifetime ortho-positronium (o-Ps) component even in thin films. Additionally, calculated intensities of the o-Ps component determined from the estimated film transmittance agreed well with the measured values. Furthermore, by applying this method to uniaxially stretched UHMWPE, we were able to observe structural changes owing to the stretching consistent with shorter measured o-Ps lifetime and increased o-Ps intensity.Keywords
Funding Information
- Ministry of Economy, Trade and Industry (Budget for promotion of strategic international st)
- Japan Society for the Promotion of Science (KAKENHI Grant Number 17K05123)
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