کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10730229 | 1042329 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
ESR dating at K and X band of northeastern Brazilian megafauna
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
تشعشع
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چکیده انگلیسی
The archaeological dose (AD) was measured in three tooth samples of giant mammals that belonged to Brazilian megafauna using electron spin resonance (ESR) spectroscopy at X-band (ν â¼9.5 GHz) and K-band (ν â¼24 GHz). Samples were collected in Lagoa de Dentro, Puxinanã city in Paraiba, a northeast state in Brazil and were identified as Haplomastodon waringi (Holland) (two teeth) and one tooth sample of Xenorhinotherium bahiense (Cartele and Lessa). The average AD led to an age for the Haplomastodon samples of 11.6 ky bp. For one sample (Haplomastodon) K-band was also employed to evaluate the AD. The K-band spectrum had three components, determined using spectral simulation as follows: a wide isotropic line with g factor 2.0048, an orthorhombic line with gx=2.0034, gy=2.0022 and gz=1.9974, and another isotropic line with g factor 2.0008. The amplitude of these three signals increase with the added dose and the average dose found was 26±5 Gy. This result is compatible with the AD determined with X-band 21±3 Gy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Radiation and Isotopes - Volume 62, Issue 2, February 2005, Pages 225-229
Journal: Applied Radiation and Isotopes - Volume 62, Issue 2, February 2005, Pages 225-229
نویسندگان
Angela Kinoshita, Alcina Magnólia Franca, José Augusto Costa de Almeida, Ana Maria Figueiredo, Patricia Nicolucci, CarlosF. O. Graeff, Oswaldo Baffa,