A5068343079- Geology and Paleoclimatology Research
- Archaeology and ancient environmental studies
- Methane Hydrates and Related Phenomena
- Planetary Science and Exploration
- Luminescence Properties of Advanced Materials
- earthquake and tectonic studies
- Geological formations and processes
- Pleistocene-Era Hominins and Archaeology
- Landslides and related hazards
- Geological and Geochemical Analysis
- Radiation Detection and Scintillator Technologies
- Forensic Anthropology and Bioarchaeology Studies
- Earthquake Detection and Analysis
- Glass properties and applications
- Isotope Analysis in Ecology
- Cryospheric studies and observations
- Maritime and Coastal Archaeology
- Coral and Marine Ecosystems Studies
- Perovskite Materials and Applications
- Hydrology and Sediment Transport Processes
- High-pressure geophysics and materials
- Solid State Laser Technologies
- Radioactivity and Radon Measurements
- Radiation Effects and Dosimetry
- Radioactive contamination and transfer
Physical Research Laboratory
2013-2024
Indian Institute of Technology Gandhinagar
2021
Kiel University
2021
PES University
2017
Inter-University Accelerator Centre
2017
Korea Basic Science Institute
2013-2015
Mohanlal Sukhadia University
1996-2014
We extend the continuity of microblade technology in Indian Subcontinent to 45 ka, on basis optical dating assemblages from site Mehtakheri, (22° 13' 44″ N Lat 76° 01' 36″ E Long) Madhya Pradesh, India. Microblade is continuously present its first appearance until Iron Age (~3 ka), making association with modern humans undisputed. It has been suggested that was developed locally by after 35 ka. The dates reported here Mehtakheri show this inference be untenable and suggest alternatively...
Measurement of low temperature (90°C–120°C) Thermoluminescence (TL) sensitivity natural quartz samples subjected to pre-heating and optical stimulation indicate that significant changes can occur during measurement the Optically Stimulated Luminescence (OSL). During signal, luminescence change by 40%. The both initial preheat OSL. currently used version Single Aliquot Regeneration (SAR) protocol measures corrects for after readout However, it does not take into account in signal. We...
By 2019, a long brick platform with some structures was exposed when the Thamirabarani River, southernmost river in city of Thirunelveli, dried up. The civic society rejoiced at discovery structure as it thought to be palace first capital Pandya dynasty, an ancient Tamil dynasty southern India. Two bricks were removed from determine their ages using luminescence dating method, and geochemical composition analyzed X-ray fluorescence method. composed mud that underwent intermediate silicate...
In this study, naturally occurring jarosite samples from Kachchh India (considered to be Martian analogue) were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Cathodoluminescence- Energy Dispersive X-ray (CL-EDXS) and luminescence (thermoluminescence (TL), blue infrared stimulated (BSL IRSL) methods. FTIR CL-EDXS studies suggested that preserves its characteristics even after annealing the 450°C. This facilitated (TL/BSL/IRSL) assess potential use of luminescence-dating...
In luminescence dating of sediments, Mayya et al. (2006) pointed out that at single grain level, the beta dose for quartz grains is heterogeneous. This heterogeneity arises due fact total potassium in sediment contributed by few feldspar with up to 11–14% stoichiometric (Huntley and Baril, 1997). Beta particles have a range ∼2 mm, which comparable sizes inter-grain distances. implies spatial fluctuation emitters (K-feldspars) around individual results heterogeneous deposition. These...
Optically Stimulated Luminescence (OSL) of quartz, with closure temperatures 30–35°C in conjunction Apatite Fission Track (AFT; temp. ∼120°C) and 40Ar-39Ar (biotite temperature ∼350°C), were used to obtain cooling ages from Higher Himalayan crystalline rocks Western Arunachal Himalaya (WAH). Cooling age data based on OSL, AFT Ar-Ar thermochronology provide inference the exhumation — erosion history for three different time intervals over million thousand year scale. Steady-state ∼0.5 mm/yr...
Abstract The eruption of Toba ca. 75 ka was the largest volcanic eruptive event during Quaternary, and evidence for this is widespread in terrestrial sediment sequences South Asia as primary reworked distal ash deposits. Youngest Tuff horizons (YTT) have been widely employed isochrons to understand link regional environmental cultural change archaeological records preserved within them. We identify YTT deposits at Retlapalle, Andhra Pradesh, India, present optical ages K-feldspar grains...
We report the development of an Electron Multiplier Charge Coupled Device (EMCCD) based luminescence dating system. The system enables position sensitive measurements for estimation spatially resolved distribution equivalent dose complex geological samples. includes: 1) a sample stimulation unit (with both thermal and optical stimulations), 2) optics that comprises imaging and, 3) data acquisition processing unit. works in LabVIEW environment with graphical user interface (GUI). User...
The chronology and hominin association of the South Asian Middle Palaeolithic have attracted much attention in last few decades. emergence culture region has been debated between local origins (behavioural change) model based on an early date around 380 ka diffusion (biological Homo sapiens dispersals from Africa 120–80 ka. latter more consensus, whereas former requires a robust chronological framework to attribute behavioural changes. In absence remains, presence technological trajectories...