Publications by authors named "Tarun K Agarwal"
A CFD-based approach to study the deposition and distribution behaviour of Pb in a calibration chamber.
Environ Sci Pollut Res Int
April 2023
Article Synopsis
- The research focuses on how decay products, specifically lead (Pb) from thoron, behave when they settle out of the air, which is important for measuring radiation safely.
- The study looked at how different air flow speeds and particle sizes affected how much Pb settles down using special computer simulations.
- Results showed that faster air flow causes more Pb to settle, but this effect becomes weaker for larger particles; the findings matched real-life experiments done in a controlled setting.
Article Synopsis
- Scientists are looking at how to measure radon gas (Rn) in places where people handle radium and thorium to keep them safe.
- A special device called a Lucas scintillation cell (LSC) is used to study radon, but how well it works depends on how the gas flows through it.
- The researchers tested different flow rates and inlet needle lengths to find the best settings for the LSC, discovering that it works best with flow rates between 0.6 and 1 liters per minute and needle lengths from 22.5 to 45 mm.
Numerical simulation of Rn profiling in an experimental chamber using CFD technique.
J Environ Radioact
September 2020
Measurement of indoor Rn concentration and interpretation of distribution patterns are important for inhalation dosimetry in occupational and residential areas. Experimental determination of Rn concentration distribution and estimation of inhalation doses depend on the underlying aspects such as calibration of the detectors, accuracy of the techniques etc. Therefore, Rn concentration distribution needs to be very well understood in a closed domain for the controlled studies.
View Article and Find Full Text PDFIndoor inhalation dose assessment for thoron-rich regions of Indian Himalayan belt.
Environ Sci Pollut Res Int
February 2019
Rn, Rn, and their decay products are significant contributors to background radiation dose. Their concentration level, pertaining exposure, and consequent dose are prime concerns in indoor environments. The present study was performed in 101 dwellings of different villages of Almora district situated in Kumaun hills of Indian Himalayan belt.
View Article and Find Full Text PDFTwo-dimensional (2D) material based FETs are being considered for future technology nodes and high performance logic applications. However, a comprehensive assessment of 2D material based FETs has been lacking for high performance logic applications considering appropriate system level figure-of-merits (FOMs) e.g.
View Article and Find Full Text PDFIn this article, we present the simulation, fabrication, and characterization of a novel bilayer graphene field-effect transistor exhibiting electron mobility up to ~1600 cm(2) V(-1) s(-1), a room temperature I on/I off ≈ 60, and the lowest total charge (~10(11) cm(-2)) reported to date. This is achieved by combined electrostatic and chemical doping of bilayer graphene, which enables one to switch off the device at zero top-gate voltage. Using density functional theory and atomistic simulations, we obtain physical insight into the impact of chemical and electrostatic doping on bandgap opening of bilayer graphene and the effect of metal contacts on the operation of the device.
View Article and Find Full Text PDF