A new AMS facility at Inter University Accelerator Centre, New Delhi

Kumar, Pankaj; Chopra, Sundeep; Pattanaik, Jitendra Kumar; Ojha, Sunil; Gargari, S.; Joshi, R.; Kanjilal, D.

doi:10.1016/j.nimb.2015.03.078

Cited by 17 publications

(5 citation statements)

References 29 publications

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“…Automated graphitization equipment was used for combustion and graphitization purposes (Wacker et al, 2010). Graphitized samples were measured using the AMS facility based on 500 kV tandem ion accelerator at IUAC, New Delhi (Kumar et al, 2015). An oxalic acid II sample from NIST (SRM 4990C) was used as a standard, and phthalic anhydride from Sigma-Aldrich (product no.…”

Section: Materials and Methodologymentioning

confidence: 99%

Tropical Rainforest Dynamics and Palaeoclimate Implications since the late Pleistocene, Nilgiris, India

et al. 2018

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A multiproxy study involving sedimentology, palynology, radiocarbon dating, stable isotopes, and geochemistry was carried out on the Parsons Valley Lake deposit, Nilgiris, India, to determine palaeoclimatic fluctuations and their possible impact on vegetation since the late Pleistocene. The 72-cm-deep sediment core that was retrieved reveals five distinct palaeoclimatic phases: (1) Warm and humid conditions with a high lake stand before the last glacial maximum (LGM; ~29,800 cal yr BP), subsequently changing to a relatively cool and dry phase during the LGM. (2) Considerable dry conditions and lower precipitation occurred between ~16,300 and 9500 cal yr BP. During this period, the vegetation shrank and perhaps was confined to moister pockets or was a riparian forest cover. (3) An outbreak in the shift of monsoonal precipitation was witnessed in the beginning of the mid-Holocene, around 8400 cal yr BP, implying alteration in the shift toward warm and humid conditions, resulting in relatively high pollen abundance for evergreen taxa. (4) This phase exhibits a shift to heavier δ13C values around ~1850 cal yr BP, with an emergence of moist deciduous plants pointing to drier conditions. (5) Human activities contributed to the exceedingly high percentage ofAcaciaandPinuspollen during the Little Ice Age.

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Section: Materials and Methodologymentioning

confidence: 99%

Tropical Rainforest Dynamics and Palaeoclimate Implications since the late Pleistocene, Nilgiris, India

et al. 2018

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“…Samples (sediments and shells) collected from the study area were radiocarbon dated (Table 2) with AMS facility at Inter University Accelerator Centre, New Delhi (Linick et al, 1989; Kumar et al, 2015; Sharma et al, 2019). Samples were pretreated and graphitized with automated graphitization equipment (AGE).…”

Section: Methodsmentioning

confidence: 99%

Saraswati River in northern India (Haryana) and its role in populating the Harappan civilization sites—A study based on remote sensing, sedimentology, and strata chronology

Chaudhri

Chopra

Kumar

et al. 2021

Archaeological Prospection

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The Saraswati River used to flow from the glaciated peaks of the Himalaya to the Arabian sea, covering a distance of about 1800 km. It possibly sustained the Harappan civilization in the Indian subcontinent. This river has been studied as a part of the Ghaggar-Satluj-Hakra-Nara channel system in India and Pakistan. This study investigated its independent existence and evolution in the Himalayan foothill terrain and the proximal alluvial plains. Use of satellite imagery, shuttle radar topography mission data, accelerator mass spectrometry 14 C dating and optically stimulated luminescence chronology is being made to identify the possible palaeo-path of this ancient river and to characterize the trench sediment log architecture of the Saraswati River palaeochannels in northern India (Haryana). Our investigations reveal that this river formed a dense web of interconnecting channels which are continuously networked for more than 2,984 km in Haryana and their individual floodplain width varies from 1.5 to 13 km. The Harappan settlements in Haryana and Rajasthan nucleated and prospered in the fertile channel bars and interfluves of this river system. Majority of these habitation sites were located within a radius of less than 500 m from these palaeo-water channel networks. Enormous amount of water was flowing through this channel network until BC 11,147. Sediment characteristics and their chronology reveal that flow of water in the river channel decreased with time as the glacial cover diminished. The varying thickness of clay beds in sediment logs is indicative of the fluctuations in water flow possibly as a consequence of terrain slope modifications and consequent gradual channel avulsion, climate change, and global drought events. The flow of water continued through the Himalayan foothill input channels of the palaeo-Saraswati River in Haryana until AD 1402.

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“…The centre is well known for ion accelerators facilitating wide-ranging low to medium energy (keV-MeV) ion-beam based experimental studies. In the past, the Earth Science fraternity has been greatly benefited from these accelerator facilities (Kumar et al, 2011(Kumar et al, , 2015, and further by utilizing 500 kV tandem ion accelerator-based Mass Spectrometer (AMS) (Sharma et al, 2018) primarily for precise measurements of cosmogenic radionuclides 14 C, 10 Be, 26 Al and associated isotopic ratio measurements and dating that has important Geological and Archaeological application. The main applications of 14 C, 10 Be, 26 Al dating include Quaternary lake and fluvial sediment studies (Lone et al, 2019; for tectonic and paleo-climates (Saini et al, 2019), erosion/denudation (Dhal et al, 2018) and exhumation history of the Himalayan mountain belt (Meenakshi et al, 2018), Paleo-seismology (Rajendran et al, 2018) and historic/prehistoric archaeological sites (Vahia et al, 2016).…”

Section: Inter-university Accelerator Center (Iuac) -National Geochronology Facility (Ngf)mentioning

confidence: 99%

New initiatives to bolster analytical facilities in India for in situ U-Th-Pb Geochronology, Hf and O isotope systematics in zircon: a focus on laboratories at the IUAC, WIHG and CSIR-NGRI

Rao¹,

Chopra²,

Kumar³

et al. 2020

PINSA

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A new AMS facility at Inter University Accelerator Centre, New Delhi

Cited by 17 publications

References 29 publications

Tropical Rainforest Dynamics and Palaeoclimate Implications since the late Pleistocene, Nilgiris, India

Tropical Rainforest Dynamics and Palaeoclimate Implications since the late Pleistocene, Nilgiris, India

Saraswati River in northern India (Haryana) and its role in populating the Harappan civilization sites—A study based on remote sensing, sedimentology, and strata chronology

New initiatives to bolster analytical facilities in India for in situ U-Th-Pb Geochronology, Hf and O isotope systematics in zircon: a focus on laboratories at the IUAC, WIHG and CSIR-NGRI

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