Uncertainties in low γ-dose determinations by means of ESR using the biomaterial modem coral reef

被引：1
|
作者：
Hassan, GM [1 ]
Sharaf, MA [1 ]
机构：
[1] Natl Inst Stand, Dept Ionizing Radiat Metrol, El Giza, Egypt
来源：
RADIATION MEASUREMENTS | 2006年 / 41卷 / 01期
关键词：
electron spin resonance; modem coral reef; biomineral; low dose range;
D O I：
10.1016/j.radmeas.2005.06.005
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 ESR spectrum of unirradiated modem aragonite coral (CaCO3) material from the Red Sea (Hurgada area) is characterized by four signals with spectroscopic splitting factors of g = 2.0056, 2.0030, 2.0006 and 1.997. The most intensive and stable line in this spectrum is attributed to CO2- radicals at g = 2.0006 +/- 0.0005. The dose response from 50 mGy to 20 Gy, energy dependence and effective atomic number are calculated so as to investigate coral as a dosimeter material in the clinical dose range. The lower experimental gamma-dose limit was found to be 50mGy with signal-to-noise (SIN) ratio of 15. The combined and expanded uncertainties accompanying these measurements are 1.72% and 3.44%, respectively. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：48 / 54
页数：7
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