Positron lifetime studies of CaSO4: Dy thermoluminescence phosphors

被引：0

作者：

Annalakshmi, O. ^{[1
]}

Chirayath, Varghese Anto ^{[1
]}

Babu, S. Hari ^{[1
]}

Jose, M. T. ^{[1
]}

Amarendra, G. ^{[1
]}

机构：

[1] Indira Gandhi Ctr Atom Res, Kalpakkam 603102, Tamil Nadu, India

来源：

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, NO 11 | 2009年 / 6卷 / 11期

关键词：

MECHANISMS;

D O I：

10.1002/pssc.200982104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Positron lifetime studies have been carried out an CaSO4:Dy phosphors with and without Teflon binder. The effect of Co-60 gamma irradiation exposure in these samples has been investigated. Unexpected CaSo(4):Dy embedded Teflon discs exhibited four lilfetime components viz. 228, 755, 3865 and 77 ps with intensities of 62%, 18%, 14% and 6% respectively. Since Teflon is used as a binder in these phosphors, the long lived components are understood to arise from this Upon radiation exposure there is a clear change in these resolved lifetime components. To understand the variation of these lifetime xomponents better, positron lifetime studies was carried out on pure CaSO4:Dy powder (without Teflon) as well as pure Teflon discs exposed to varying radiation doses. The variation of positron lifetime parameters of CaSO4:Dy powder showed systematics, ascribabic to SO4 ion formation due to gamma-ray exposure. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2516 / 2518

页数：3

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