PPT-1 Nuclear Radiation Natural Radioactivity

A person working with radioisotopes wears protective clothing and gloves and stands behind a shield 2 Radioactive Isotopes A radioactive isotope has an unstable nucleus emits radiation to become more stable. Radioactivity. Science Park HS -- Honors Chemistry. Early Pioneers in Radioactivity. Roentgen:. Discoverer of X-rays 1895. Becquerel:. Discoverer of Radioactivity 1896. The Curies:. Discoverers of Radium and Polonium 1900-1908. Fourth lecture. Discovery of radio activity. Radioactivity was the first nuclear phenomenon to be discovered , the credit for this discovery goes to the French physicist Henri Becquerel (1896) .. Radioactivity . Knowledge of subatomic particles has led to many advancements- unfortunately besides the advancements in power plants there has been costs-nuclear warfare and waste. Nuclear Decay. The nucleus-cluster of protons and neutrons-is in the centre of an atom. For . B.Sc. Chemistry (General), Part- I. By. Dr. . Kakoli. . Banerjee. Department of Chemistry. Aims and Objectives. Definition of Radioactivity . Discovery of Radioactivity- The Pioneers. Cause of Radioactivity- Nuclear Instability. Paula L. . Diaconescu. Why talk about nuclear energy?. http://copper.chem.ucla.edu/pldgroup/index.htm. Whitesides. . Science. 2007. The news. Nuclear power now generates 15% of the world's electricity.. Review. What is . electromagnetic radiation. ?. radiation moving at the speed of light. To a certain degree the stability of a nucleus can be correlated to its . ratio of _________ to ________. Protons, neutrons. Atomic . and Nuclear Physics. Dr. David . Roelant. Atomic and Molecular Weight. Problem 1. Using the data in the table below, compute the atomic weigh of naturally occurring oxygen.. Isotope. Abundance. radiation … radioactive material. What are they? . exposure … contamination. Are they the same?. Radioactivity. Spontaneous emission of radiation from the nucleus of an unstable isotope. Disintegration Decay. Fission produces highly radioactive isotopes. All of the highly radioactive materials on earth have been produced by fission.. Cs-137 (Cesium-137). Cs-137 is . produced by nuclear fission . for use in medical devices and gauges. . The Discovery of Radioactivity. Henri Becquerel (1896): . Investigated the effect . of sunlight on crystals of . uranium salts. . By chance he left sample . . resting on a . photographic plate wrapped . Beside shock blast and heat a nuclear bomb generates high intensity flux of radiation in form of -rays x-rays andneutrons as well as large abundances of short and long-lived radioactive nuclei which c measurements for decommissioning facilities P Fichet (1), C Mougel (1), I Desnoyers (2), P Sardini (3), H Word (4) (1) Den – Service d’Etudes Analytiques et de Réactivité des Surfaces (SEAR The cell life cycle The cell cycle G0 = Cell is resting G1 = RNA and proteins are made S = DNA is made G2 = Apparatus for mitosis is built M = Mitosis (the cell divides into 2 cells) G0 phase (restin Rate of Radioactive decay with units. Geiger-Muller Counter. An atom is composed of positively charged nucleus that is surrounded by. negatively charged electrons.. The number of electrons is equal to the number of protons = Atomic Number.