PPT-Nuclear Chemistry RadioActivity

What is it All substance are made of atoms These have electrons e around the outside and a nucleus in the middle The nucleus consists of protons p and neutrons n and is extremely small Atoms are almost entirely made of empty space. Sections 32-1 . – 32-9. Physics 1161: . . Lecture . 25. Radioactivity. Spontaneous emission of radiation from the nucleus of an unstable isotope.. Marie Curie. 1867 - 1934. Wilhelm Roentgen. 1845 - 1923. 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. Chapter . 19. Copyright © The McGraw-Hill Companies, Inc.  Permission required for reproduction or display.. 2. Chemical Processes vs. . Nuclear Processes. Chemical reactions involve changes in the electronic structure of the atom. Definition . Technetium (99mTc) . macrosalb. injection is a sterile. , a . pyrogenic. . suspension of human albumin in the form of irregular insoluble aggregates obtained by denaturing human albumin in aqueous solution. http://www.npl.co.uk/educate-explore/factsheets/ionising-radiation/. We’re surrounded by radioactivity everyday.. Some sources are natural and some sources are anthropogenic (human made.). We’re going to investigate some sources of natural radioactivity found in the environment.. 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. In a normal chemical reaction, the nucleus of an atom remains unchanged. However, in nuclear reaction, the nucleus of an atom often changes. This reaction causes radiation to be given off.. Radioactivity. 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. . Joseph T. Hodges. , Adam J. Fleisher, Qingnan Liu, Abneesh Srivastava and David A. Long. Chemical Sciences Division. National Institute of Standards and Technology . Gaithersburg, MD. joseph.hodges@nist.gov. Nuclear chemistry is the study of the structure of and the they undergo.. atomi. c nuclei. changes. Chemical vs. Nuclear Reactions. • What is “Inorganic Chemistry”?. . - descriptor or professional subfield. . - same as “General Chemistry”?. • Highlights from the inorganic timeline. . - Lavoisier: origin of modern chemistry. What are they? . exposure … contamination. Are they the same?. Radioactivity. Spontaneous emission of radiation from the nucleus of an unstable isotope. Disintegration Decay. Demonstrate Decontamination. nEXO. collaboration. The University of Alabama. Radon daughter plate-out . as a background source in nEXO. Motivation: Radon daughter background. Radon daughters can deposit on the nEXO detector surfaces while they are exposed to air:. A naturally . radioactive element . will . emit . energy without the absorption of energy from an outside source. . The nucleus of an element becomes radioactive because of an unstable ratio of protons to neutrons in the nucleus..