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| Reference : Residual doses in recent alluvial sediments from the ardenne (S Belgium) |
| Scientific journals : Article | |||
| Physical, chemical, mathematical & earth Sciences : Multidisciplinary, general & others Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography | |||
| http://hdl.handle.net/2268/37991 | |||
| Residual doses in recent alluvial sediments from the ardenne (S Belgium) | |
| English | |
| Vandenberghe, D. [> > > >] | |
| Derese, C. [> > > >] | |
Houbrechts, Geoffrey  [Université de Liège - ULg > Département de géographie > Géomorphologie fluviatile, hydrographie >] | |
| 2007 | |
| Geochronometria | |
| Wind-J Wojewoda Publ Co | |
| 28 | |
| 1-8 | |
| International | |
| 1733-8387 | |
| Wroclaw | |
| [en] optical dating ; resetting ; alluvial deposits ; Ardenne | |
| [en] We report on our first investigations into the potential of optical dating for determining the rate of river flood sedimentation in the Ardenne region (S Belgium). Two samples collected from a recent alluvial deposit were used to investigate the extent of resetting in different particle size fractions of quartz (4-11 mu m, 63-90 mu m, 90-125 mu m, 125-180 mu m, 180-212 mu m and 212-250 mu m) as well as in polymineral fine (4-11 mu m) grains. Both samples show satisfactory OSL and IRSL characteristics. The IRSL signals from the polymineral fine grains yield an equivalent dose (D-e) of 3-4 Gy, while a D-e of 0.3-0.6 Gy was measured using large aliquots of quartz. Small aliquot analyses of 63-90 mu m and 212-250 mu m quartz grains confirm that the coarser fraction contains more grains with lower D-e's. Furthermore, for a modern sample (< 3 years old), similar to 60% of the aliquots yields a D-e consistent with zero, indicating that these contain only well-bleached grains. These findings suggest that it might be possible to extract the true burial dose from dose distributions measured using small aliquots of coarse-grained (e.g. 212-250 mu m) quartz. | |
| http://hdl.handle.net/2268/37991 | |
| 10.2478/v10003-007-0024-z |
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