Refine your search
Collections
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Panda, D. K.
- Development of a Cerium-Doped Lanthanum Bromide Gamma-Ray Spectrometer for Planetary Missions and Feasibility Studies for Determination of Elemental Abundances of Radioactive Elements (Th, K and U)
Abstract Views :408 |
PDF Views:145
Authors
Affiliations
1 Planetary Sciences and Exploration Group, Physical Research Laboratory, Ahmedabad 380 009, IN
1 Planetary Sciences and Exploration Group, Physical Research Laboratory, Ahmedabad 380 009, IN
Source
Current Science, Vol 110, No 11 (2016), Pagination: 2135-2138Abstract
We present the development of a cerium-doped lanthanum bromide (LaBr3 : Ce) gamma-ray spectrometer (GRS) with the primary objective of determining the abundance and distribution of Th, U, K, and other major elements, including Fe on the entire planetary surface by measuring gamma-ray signals produced by radioactive decay, neutron inelastic scattering and neutron capture reactions in the energy region 0.03- 8 MeV. The energy resolution of the LaBr3 : Ce GRS developed in-house using front-end and processing electronics at 511 and 1274 keV is estimated to be 4.1% and 2.5% respectively. The intrinsic activity count rate for our 3n * 3n LaBr3 : Ce GRS is ~61 counts s-1 (i.e. ~0.18 counts s-1 cm-3) for the 40K energy window (1400-1520 keV) and ~3.4 counts s-1 for the 232Th (2550-2700 keV) energy window. Although this large intrinsic activity of the LaBr3 : Ce crystal inhibits estimation of the concentrations of Th and K, our attempts using a NaI(Tl) GRS (with electronics developed in-house) were more successful. The Th concentration of US-110 was estimated to be ~11.4 ppm and is within 14% of the 13.2 ppm value determined using a HPGe GRS. The K concentration of US-110 was estimated to be 0.87% and is within ~10% of the 0.78% value determined independently using a HPGe GRS.Keywords
Cerium Radioactive Elements, Gamma Ray Spectroscopy, Lanthanum Bromide, Sodium Iodide.Full Text
- Chronology of Coastal Dune Ridges in Vaigai Prodelta Region, Southeastern Tamil Nadu, India
Abstract Views :381 |
PDF Views:133
Authors
Affiliations
1 Department of Remote Sensing, Bharathidasan University, Tiruchirappalli 620 023, IN
2 Physical Research Laboratory, Ahmedabad 380 009, IN
1 Department of Remote Sensing, Bharathidasan University, Tiruchirappalli 620 023, IN
2 Physical Research Laboratory, Ahmedabad 380 009, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 382-388Abstract
The Tamil Nadu coastline, India, has extensive dunes which can be used for inferring quaternary palaeoclimates. In the present study, we aim to determine the chronology of the dunes in the Vaigai prodelta region along the southeastern coastline of the country. Optically stimulated luminescence ages for the elevated beach ridge samples SANK-5, SANK-4, SANK-3, SANK-2 and SANK-1 were estimated to be 0.9 ± 0.1, 1.1 ± 0.1, 1.8 ± 0.2, 5.3 ± 0.4 and 27 ± 2.3 ka respectively, from top to bottom of the section. The first four phases of aeolian activation occurred in marine oxygen isotope stage-1, whereas the ~27 ka age suggests that sediment deposition occurred in marine oxygen isotope stage-3. The luminescence ages were in stratigraphic order, and represent the first dates of aeolian activation in the Vaigai region.Keywords
Aeolian Activation, Chronology, Coastline, Luminescence Ages, Palaeoclimate, Red Dunes.Full Text
References
- Gardner, R. A. M., Reddening of dune sands – evidence from southeast India. Earth Surface Process. Landforms, 1981, 6, 459– 468.
- Jayangondaperumal, R., Murari, M. K., Sivasubramanian, P., Chandrasekhar, N. and Singhvi, A. K., Luminescence dating of fluvial and coastal red sediments in SE coast, India, and implications for paleoenvironmental changes and dune reddening. Quaternary Res., 2012, 77, 468–481.
- Huntley, D. J., Hutton, J. T. and Prescott, J. R., Optical dating using inclusions within quartz grains. Geology, 1993, 21, 1087– 1090.
- Banerjee, D., Bøtter-Jensen, L. and Murray, A. S., Retrospective dosimetry: estimation of the dose to quartz using the single-aliquot regenerative-dose protocol. Appl. Radiat. Isot., 2000, 52, 831– 844.
- Murray, A. S. and Wintle, A. G., Luminescence dating of quartz using an improved single-aliquot regenerative-dose protocol. Radiat. Meas., 2000, 32, 57–73.
- Thiel, C., Buylaert, J. P., Murray, A. S., Terhorst, B., Hofer, I., Tsukamoto, S. and Frechen, M., Luminescence dating of the Stratzing loess profile (Austria) – testing the potential of an elevated temperature post-IR IRSL protocol. Quaternary Int., 2011, 234, 23–31.
- Buylaert, J. P., Jain, M., Murray, A. S., Thomsen, K. J., Thiel, C. and Sohbati, R., A robust feldspar luminescence dating method for Middle and Late Pleistocene sediments. Boreas, 2012, 41, 435– 451.
- Zhang, J., Tsukamoto, S., Nottebaum, V. and Lehmkuhl, F., De plateau and its implications for post-IR IRSL dating of polymineral fine grains. Quaternary Geochronol., 2015, 30, 147–153.
- Li, B. and Li, S. H., Thermal stability of infrared stimulated luminescence of sedimentary K-feldspar extracts. Radiat. Meas., 2011, 46, 29–36.
- Banerjee, D., Murray, A. S., Bøtter-Jensen, L. and Lang, A., Equivalent dose estimation using a single aliquot of polymineral fine grains. Radiat. Meas., 2001, 33, 73–94.
- Lamothe, M., Forget Brisson, L. and Hardy, F., Dose recovery performance in double IRSL/pIRIR SAR protocols. Radiat. Meas., 2018, 120, 120–123.
- Colarossi, D., Duller, G. A. T., Roberts, H. M., Exploring the behaviour of luminescence signals from feldspars: implications for the single aliquot regenerative dose protocol. Radiat. Meas., 2018, 109, 35–44.
- Rashidi, Z., Sohbati, R., Karimi, A., Farpoor, M. H., Khormali, F., Thomson. W. and Murray, A. S., Constraining the timing of palaeosol development in Iranian arid environments using OSL dating. Quaternary Geochronol., 2019, 49, 92–100.
- Godfrey-Smith, D. I., Huntley, D. J. and Chen, W. H., Optical dating studies of quartz and feldspar sediment extracts. Quaternary Sci. Rev., 1988, 7, 373–380.
- Murray, A. S., Thomsen, K. J., Masuda, N., Buylaert, J. P. and Jain, M., Identifying well bleached quartz using the different bleaching rates of quartz and feldspar luminescence signals. Radiat. Meas., 2012, 47, 688–695.
- Railsback, L. B., Gibbard, P. L., Head, M. J., Voarintsoa, N. R. G. and Toucanne, S., An optimized scheme of lettered marine isotope substages for the last 1.0 million years, and the climatostratigraphic nature of isotope stages and substages. Quaternary Sci. Rev., 2015, 111, 94–106.
- Alappat, L., Frechen, M., Ramesh, R., Tsukamoto, S. and Srinivasalu, S., Evolution of late Holocene coastal dunes in the Cauvery delta region of Tamil Nadu, India. J. Asian Earth Sci., 2011, 42, 381–397.
- Alappat, L., Joseph, S., Tsukamoto, S., Kaufhold, S. and Frechen, M., Chronology and weathering history of red dunes in the southwest coast of Tamil Nadu, India. German J. Geol., 2016, 168, 183–198.
- Tiwari, M., Singh, A. K. and Ramesh, R., High-resolution monsoon records since the last glacial maximum: a comparison of marine and terrestrial paleoarchives from South Asia. J. Geophys. Res., 2011; doi:10.1155/2011/765248.
- Overpeck, J., Anderson, D., Trumbore, S. and Prell, W., The southwest Indian monsoon over the last 18,000 years. Climate Dynamics, 1996, 12, 213–225.
- Kale, V. S. and Rajaguru, S. N., Late Quaternary alluvial history of northwest Deccan Upland region. Nature, 1987, 325, 612–614.
- Banerjee P. K., Holocene and Late Pleistocene relative sea level fluctuations along the east coast of India. Mar. Geol., 2000, 167, 243–260.
- Kunz, A., Frechen, M., Ramesh, R. and Urban, B., Luminescence dating of late Holocene dunes showing remnants of early settlement in Cuddalore and evidence of monsoon activity in south east India. Quaternary Int., 2010, 222, 194–298.
- Singhvi, A. K., Deraniyagala, S. U. and Sengupta, D., Thermoluminescence dating of Quaternary red sand beds. A case study of coastal dunes in Sri Lanka. Earth Planet. Sci. Lett., 1986, 80, 139– 144.