RADIOACTIVE DECAY AND HALF-LIFE CONCEPTS

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Contents of this slide-share presentation:
Understanding decay concepts
Facts about Radioactive decay
Types of radioactive decay
Understanding Half-life concepts
Graphing and calculating Half-life
Using count rate to study and analyse radioactive decay

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RADIOACTIVE DECAY AND HALF-LIFE CONCEPTS

  1. 1. RADIOACTIVE DECAY <ul><li>Understanding decay concepts </li></ul><ul><li>Facts about Radioactive decay </li></ul><ul><li>Types of radioactive decay </li></ul><ul><li>Understanding Half-life concepts </li></ul><ul><li>Graphing and calculating Half-life </li></ul><ul><li>Using count rate to study and analyse radioactive decay </li></ul>Contents of this slide-share presentation Copyright www.sciencetutors.zoomshare.com
  2. 2. What is radioactive decay? <ul><li>Radioactive decay is the process in which an unstable atomic nucleus loses energy by emitting ionizing particles and radiation transforming the parent nuclide atom into a different atom called daughter nuclide . </li></ul>
  3. 3. RADIOACTIVE COUNT RATE The count rate of a radioactive substance is the amount of radiation detected by GM counter coming from the radioactive substance . How to Calculate Count Rate knowing the half-life of a radioactive sample/substance, can be useful when calculating what the count rate will be at some time in the future
  4. 4. Radioactive Decay <ul><li>Decay or loss of energy transforms the parent atom ( parent nuclide ) into an atom of different chemistry ( daughter nuclide ) </li></ul>Original atoms before decay (Parent atoms or parent nuclide) The different atoms formed after decay (Daughter atoms or daughter nuclide)
  5. 5. Facts about Radioactive Decay <ul><li>It is a random process that involves unstable atomic nucleus. </li></ul><ul><li>Predicting when a given atom will decay is impossible. </li></ul><ul><li>Decay rate on the average is predictable </li></ul><ul><li>There are three types of decay-alpha, beta and gamma radioactive decay. </li></ul><ul><li>Electron capture a type of beta decay occurs when the neutron to proton ratio is a relatively small. </li></ul><ul><li>Too many protons or positive charge particles in the nucleus results in alpha decay. </li></ul><ul><li>A high ratio of neutron to proton causes instability in the nucleus and leads to beta decay. </li></ul><ul><li>Nucleus excess energy causes instability, and needs to fall to a low energy state to achieve relative stability. In the process the nucleus emits a high energy photon called gamma particle. </li></ul> email: whysciencetutors@yahoo.com or visit www.sciencetutors.zoomshare.com
  6. 6. Look at the graph above and calculate the half-life of the sample . <ul><li>The count rate of a radioactive substance is 40 counts per second. The count rate after 5 minutes is 20 per second. How long is the half life of this radioactive substance? Guess the new count rate after 10 minutes. </li></ul> email: whysciencetutors@yahoo.com or visit www.sciencetutors.zoomshare.com
  7. 7. HALF-LIFE <ul><li>What is the Half-life of a Radioactive substance? </li></ul><ul><li>The half-life is the amount of time it takes for half of the atoms in a sample of a radioactive substance to decay. </li></ul><ul><li>Half-life is also defined as the time it takes for half of the original substance to decay away </li></ul> email: whysciencetutors@yahoo.com or visit www.sciencetutors.zoomshare.com
  8. 8. For more Half-life calculations and other related topics Visit www.sciencetutors.zoomshare.com Or  email: whysciencetutors@yahoo.com

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