Publication Details (including relevant citation information):
Lignesh Durai, Sabnam A, Arthi Gopalakrishnan, T. Vijayakumar,Detection of γ-Radiations using Lead Sulfide Nanostructures: Through Optical Properties, International Journal of Scientific and Engineering Research 8(1):1910 · February 2017. DOI: 10.14299/ijser.2017.01.001
Homeland Security is the prime factor to weigh a nation’s strength or its immune system to overlook all the threats from various terrorist groups. It’s always better to have a prevention system than having a curing system. In order to prevent terrorism attacks and other civilized attacks in the home land, the security system must be the strongest one in all means. Apart from the other types of weapons used, the very dangerous weapon is the Nuclear weapon which can demolish the infrastructure of the nation along with its growth for upcoming years in greater impact. To avoid the nuclear weapon migration into the nation there are many technology such as Scanning process at airports, railway stations and harbors. They use metal detectors and CT scanners along with Scintillators to detect the nuclear weapon though the gamma radiation from the materials as U-235, also known as highly enriched uranium (HEU) and plutonium. This work concentrates on the detection of those gamma radiations in the atmosphere in minimum quantities even from 1KGy and below. The quantum dots of PbS are more efficiency in detecting the radiation from the materials or weapons. At present single crystal scintillators with sodium iodide being used worldwide for the Security Purposes. The Lead Sulfide Quantum Dots are prepared using the Hines and Scholes method of Hot Injection Technique, in Lead Oleate. The prepared PbS Quantum Dots are Examined Using Particle Size Analyzer, Dynamic Light Scattering Spectroscopy. Photoluminescence, FTIR Spectroscopy and the synthesized quantum dot was been found with a diameter of 4-6 nm. The Optical Properties of the PbS QDs are studied before and after irradiation of gamma radiation (with CO-60 as the Source of gamma Radiations) and using the difference the optical response of the lead sulfide are studied under gamma radiation.