PPT-Lecture 8 Radioactive Isotopes

Definitions and types of decay Derivation of decay e quations Half l ives and mean lives Secular Equilibrium Useful radiotracers in oceanography E amp H Chpt 5 The chart of the nuclides decay. 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.. Jasmine . Sudhu. 5/30/13. Chemistry 10.. What are Isotopes?. Isotope – Is the average mass of atoms. You round of the atomic mass to the nearest whole numbers to get your two possible Isotopes.. Example – Boron- Atomic mass = 10.81. After rounding to the closet two whole numbers which are 10 and 11, your . Problems and Trends of Development. (Georgian case). Giorgi. . Nabakhtiani. Georgian-German Science Bridge, Workshop 6-12July, Tbilisi, Georgia. (IAEA definitions). Radioactive waste:. Radioactive material for which no further use is foreseen. 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. Definitions and types of decay. Derivation . of decay . e. quations. Half l. ives and mean lives. Secular . Equilibrium. Useful . radiotracers . in . oceanography. E & H . Chpt. 5. The chart of the nuclides - decay. What is it?. Isotopes are different versions of atoms having the same number of protons but different numbers of neutrons.. Atomic Mass. The mass of each isotope is different due to the different number of neutrons.. 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 deca. y . (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. 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.. Neutrons. Electrons. Charge. 1. 0. -1. Mass . 1 . amu. 1 . amu. 0. Location. nucleus. nucleus. Electron cloud. Isotopes. Atoms that have the same number of protons, but have different numbers of neutrons. Radiation refers to the process that is concerned with the passage of energy between places through space. . It is the radiation generated by sun that . regulates the temperature of earth. . . CLASSIFICATION OF RADIATION: ionizing or non-ionizing types. . Two or more forms of an element that have the same number of protons but different numbers of neutrons, leading to different atomic mass.. Two types: . radioactive. and . stable. Stable isotopes do NOT break down (decay) over time..