PPT-Radioactive Decay Please open up your journal to your chemistry unit and write a definition

How can anyone know the age of something millions of years ago Scientists for many years did not have a way to determine the age of fossils rocks or even our planet Isotopes Atoms of the same element can have different numbers of neutrons the different possible versions of each element are called . 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. 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. . Chemistry. How does a nuclear reactor work?. http://www.lanl.gov/science/1663/images/reactor.jpg. How does a small mass contained in this bomb cause……. Nuclear Bomb of 1945 known as . “. fat man. What is Radioactive Decay?. What is Radioactive Dating?. How do Scientists Determine Earth’s Age?. 93.75%. 6.25%. What is Radioactive Dating?. . DE 1:24 . 1. 3.9 billion years. 2. 22, 920 years. Jim Hartnett. PHYS 3305. Radioactive Decay - Jim Hartnett. 1. What is it?. Macroscopic Effects. Types of Decay. The Decay Chain. Fission. Radioactive Decay - Jim Hartnett. 2. Radioactive Decay. A nucleus may be bound in a relatively high energy state, and if it can attain a lower energy, it will eventually do so. What we will learn about Fossils?. We will learn how fossils form?. What types of fossils exist?. How do scientists determine the age of fossils?. What do fossils reveal to scientists?. What is a fossil?. 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). Lecture 9. Absolute Dating of the Earth. Major Concepts. The discovery of radioactivity in the early 1900’s and the recognition that . radioactive decay . (a statistical event) occurs at a constant average rate for particular unstable isotopes has provided a means of determining the absolute ages of earth materials. 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.. Section 21.1 Types of Radioactivity. Objectives: Analyze Common Sources of Background Radiation, Compare and Contrast Alpha, Beta and Gamma Radiation, Apply the concept of Half-Life of a Radioactive Element. 24.1 Nuclear Radiation. 24.2 Radioactive Decay (includes decay rates & radiochemical dating). 24.3 Nuclear Reactions (Transmutation. Part only). 24.4 Applications & Effects of Nuclear Reactions (except for radiation dose and intensity/distance). Commenwealth. of Massachusetts (Radiation Control Program), as specified by 105 CMR 120. . http://www.mass.gov/dph/rcp/radia.htm. . Copies of the license, active amendments, and relevant correspondence are maintained in the office of Clark’s Radiation Safety Officer, Dr. David L. Thurlow, .