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Shukla, A. D.
- 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 :246 |
PDF Views:91
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 :252 |
PDF Views:90
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
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- Meteorite Fall in Bhojade Village, Kopargaon Taluk, Ahmednagar District, Maharashtra, India
Abstract Views :81 |
PDF Views:68
Authors
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, India., IN
1 Physical Research Laboratory, Ahmedabad 380 009, India., IN
Source
Current Science, Vol 124, No 10 (2023), Pagination: 1138-1139Abstract
No Abstract.Full Text
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- The Diyodar Meteorite Fall in India
Abstract Views :80 |
PDF Views:52
Authors
Y. Srivastava
1,
A. Kumar
1,
A. Basu Sarbadhikari
1,
D. Ray
1,
V. M. Nair
1,
A. Das
1,
A. D. Shukla
1,
S. Sathiyaseelan
1,
R. Ramachandran
1,
B. Sivaraman
1,
S. Vijayan
1,
N. Panwar
1,
A. J. Verma
1,
N. Srivastava
1,
A. Rani
1,
G. Arora
1,
R. R. Mahajan
1,
A. Bhardwaj
1
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, India., IN
1 Physical Research Laboratory, Ahmedabad 380 009, India., IN
Source
Current Science, Vol 124, No 2 (2023), Pagination: 152-154Abstract
No Abstract.Full Text
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