Analysis of uncertainties in the IAEA/WHO TLD postal dose audit system

被引：25

作者：

Izewska, J. ^{[1
]}

Hultqvist, M. ^{[2
]}

Bera, P. ^{[1
]}

机构：

[1] IAEA, Dept Nucl Sci & Applicat, A-1400 Vienna, Austria

[2] Stockholm Univ, Karolinska Inst, Dept Med Radiat Phys, S-10691 Stockholm, Sweden

来源：

RADIATION MEASUREMENTS | 2008年 / 43卷 / 2-6期

关键词：

uncertainties in TLD system; TLD postal audit; radiotherapy dose comparison;

D O I：

10.1016/j.radmeas.2008.01.011

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The International Atomic Energy Agency (IAEA) and the World Health Organisation (WHO) operate the IAEA/WHO TLD postal dose audit programme. Thermoluminescence dosimeters (TLDs) are used as transfer devices in this programme. In the present work the uncertainties in the dose determination from TLD measurements have been evaluated. The analysis of uncertainties comprises uncertainties in the calibration coefficient of the TLD system and uncertainties in factors correcting for dose response non-linearity, fading of TL signal, energy response and influence of TLD holder. The individual uncertainties have been combined to estimate the total uncertainty in the dose evaluated from TLD measurements. The combined relative standard uncertainty in the dose determined from TLD measurements has been estimated to be 1.2% for irradiations with Co-60 gamma-rays and 1.6% For irradiations with high-energy X-rays. Results from irradiations by the Bureau international des poids et mesures (BIPM), Primary Standard Dosimetry Laboratories (PSDLs) and Secondary Standards Dosimetry Laboratories (SSDLs) compare favourably with the estimated uncertainties, whereas TLD results of radiotherapy centres show higher standard deviations than those derived theoretically. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：959 / 963

页数：5

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