Dr. R. Krishnamoorthy
PG and Research Department of Zoology, Jamal Mohamed College,
Tiruchirappalli, Tamil Nadu, India
Title of presentation: Distribution and Bio accumulation Of Naturally Occurring Radionuclides in the Environment
Radiation has always been the part of our environment. Naturally occurring radioactive sources in soil, water and air contribute to ionizing radiation. In addition to this, man-made sources resulting from mining and usage of natural radioactive materials in power generation, nuclear medicine, consumer products, military and industrial applications also produce ionizing radiation. Natural background radiation comes from four primary sources such as cosmic radiation, solar radiation, terrestrial sources andradon. Radon-222 is produced by the decay of radium-226 which is present wherever uranium is found. Since radon is a gas, it seeps out of uranium-containing soil found across the world and may accumulate in well-sealed homes. It is often the single largest contributor to the individual’s background radiation dose and their level varies from location to location.Radon-222 decays to Polonium, Lead, and Bismuth and these isotopes are called Radon daughters or radon progeny. The Earth and all living things on it are constantly bombarded with radiation from outside our solar system. This radiation interacts in the atmosphere to create secondary radiation that rains down, including x-rays, muons, protons, alpha particles, pions, electrons, and neutrons. Solar radiation is radiant energy emitted by the sun, particularly the electromagnetic energy. About half of the radiation is in the visible short-wave part of the electromagnetic spectrum; the other half is mostly in the near-infrared part, with some in the ultraviolet part of the spectrum. The portion of this ultraviolet radiation that is not absorbed by the atmosphere produces a suntan or a sunburn on people who have been in sunlight for extended periods of time. Most materials on Earth contain some radioactive atoms, even if in small quantities. Most of the terrestrial non-radon-dose received from these sources is from gamma-ray emitters in the walls and floors when inside a house, or rocks and soil when outside. The major radionuclides of concern for terrestrial radiation are potassium, uranium, and thorium. The southern coastal region of India shows a prominently high radioactivity (>3500 µGy/Y) representing a well-known monazite deposits along the coastal line of Kerala and in the southern coats of Tamil Nadu.
Key words: Environment Radiation, Monazite, Natural Radioisotopes
Biography: Dr. R. Krishnamoorthy presently working as a Assistant Professor in Zoology got his Ph.D degree from NAAC A Grade State University (Bharathidasan University). He received fellowship from Department of Atomic Energy – Board of Research in Nuclear Sciences, Govt. of India. His areas of Specialization are Radiation Biology, Thermal Ecology and Environmental Biotechnology. He has attended a number of National and International Seminars and workshops and delivered lectures in different organizations on various topics. He has written five books in Zoology and Environmental Sciences. He has many Research Papers to his credit and has Teaching and Research experience of more than fifteen years. He is recipient of many National and International Awards and operating DST funded Major Research Project.