Comparison of single-grain and small-aliquot OSL dose estimates in Formula Not Shown years old river sediments from South India
- 作者：Thomas ; P.J. ; Jain ; M. ; Juyal ; N. ; Singhvi ; A.K.
- 关键词：Quartz ; Fluvial ; Partial bleach ; Single grain ; Dose distribution ; River Penner
- 刊名：Radiation Measurements
- 出版年：2005
- 期刊代码：71_13504487
- 类别：ce
- 出版时间：October, 2005
- 卷：39
- 期：5
- 页码：457-469
- 文件大小：475 K
摘要
We report on OSL dose distributions derived from small-aliquot and single grains of quartz in young fluvial sediments sampled from the Penner River basin, South India. The single-grain dose distributions suggest that 13 out of 19 samples were well bleached. In many well-bleached samples, there was an underestimation in the single-aliquot dose estimates as compared to those from the single grain—the difference between average dose estimates determined by the two methods ranged from 1%to 31%. Such a dose underestimation was not detectable in poorly bleached samples. Various possible reasons for the discrepancy between single-grain and small-aliquot dose estimates are discussed. Although there is no satisfactory explanation for this discrepancy, we speculate that the difference in the stimulation wavelengths, in the case of single-aliquot and 532 nm in the case of single grains, could perhaps be one of the reasons; this may occur because the stimulation wavelength affects the proportion of the medium and slow components in the initial signal.