PPT-Radioactive Decay I can solve half-life problems.

Radioisotopes decay in a predictable way The time is takes for half of a sample to decay is called the half life for the isotope Every radioactive element has a unique halflife C14 is . 75 375 6 825 10 1175 Toilets Start 6 825 Finish Event Start Line Key North Half Marathon Course Map not to scale Locations are approximate Course subject to change with out notice www AllCommunityEvents com The purpose of this experiment is . to use first-order nuclear decay kinetics to determine the half-life of a nuclear reaction.. Smoke Detectors. Americium-241. Smoke from a fire can be detected at a very early stage. 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 . Continuation of Journal Entry #5. Radiometric Dating. A technique used to date materials such as rocks based upon a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products using known rates of decay.. True. False. Types of radioactive decay. Gamma. Beta (+,-, . e.c. .). Alpha. Neutron emission. Fission. Fusion. http://ie.lbl.gov/education/isotopes.htm. Gamma Decay. Nucleus in excited state gives off energy as a photon. Why are some elements (isotopes) more stable than others?. The Nucleus. The Electric Force. Protons hate Protons. Strong Force. Strong Force Facts. Neutrons act like cement. Strong Force is very strong over a small distance (about the distance of two protons). Nuclear Power Plant in . Richland, WA. Review From . Friday. ’s . Lesson. The Band of Stability. Certain isotopes are more stable than others. The ratio of protons to neutrons is important in determining stability. some atoms are unstable. …occasionally emitting particles. from nucleus to become more stable. (radioactivity). this changes the atom. into a different type of . atom (parent element. decays to daughter element). Chart of the Nuclides. General Layout. Each nuclide occupies a square in a grid where. Atomic number (Z) is plotted vertically. Number of neutrons (N) is plotted horizontally. Heavily bordered square at left side of each row gives. : . the amount of time it takes half of a radioactive sample to decay.. .  . Total. Time. Half-Life #. Fraction of Radioactive Atoms Remaining. Fraction of Radioactive Atoms Decayed.  . 0.  .  . When sedimentary rock is deposited in layers it is deposited horizontally.. Scientists use this “Principle of Original Horizontality” to help them determine the age of the layers.. The older layers of rock are found below the younger layers of rock.. to use first-order nuclear decay kinetics to determine the half-life of a nuclear reaction.. Smoke Detectors. Americium-241. Smoke from a fire can be detected at a very early stage. Where might we see radioactive materials in everyday life?. I can:. -recognize the meaning of radioactive. . -recognize . that through radioactive decay, the unstable nucleus emits radiation in the form of very fast-moving particles and energy to produce a new nucleus, thus changing the identity of the element and nuclei that undergo this process are said to be radioactive. .