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RADIOACTIVE DECAY AND HALF-LIFE CONCEPTS
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RADIOACTIVE DECAY AND HALF-LIFE CONCEPTS

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Contents of this slide-share presentation: …

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

Published in: Education, Technology

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  • 1. RADIOACTIVE DECAY
    • 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
    Contents of this slide-share presentation Copyright www.sciencetutors.zoomshare.com
  • 2. What is radioactive decay?
    • 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 .
  • 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. Radioactive Decay
    • Decay or loss of energy transforms the parent atom ( parent nuclide ) into an atom of different chemistry ( daughter nuclide )
    Original atoms before decay (Parent atoms or parent nuclide) The different atoms formed after decay (Daughter atoms or daughter nuclide)
  • 5. Facts about Radioactive Decay
    • It is a random process that involves unstable atomic nucleus.
    • Predicting when a given atom will decay is impossible.
    • Decay rate on the average is predictable
    • There are three types of decay-alpha, beta and gamma radioactive decay.
    • Electron capture a type of beta decay occurs when the neutron to proton ratio is a relatively small.
    • Too many protons or positive charge particles in the nucleus results in alpha decay.
    • A high ratio of neutron to proton causes instability in the nucleus and leads to beta decay.
    • 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.
     email: whysciencetutors@yahoo.com or visit www.sciencetutors.zoomshare.com
  • 6. Look at the graph above and calculate the half-life of the sample .
    • 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.
     email: whysciencetutors@yahoo.com or visit www.sciencetutors.zoomshare.com
  • 7. HALF-LIFE
    • What is the Half-life of a Radioactive substance?
    • The half-life is the amount of time it takes for half of the atoms in a sample of a radioactive substance to decay.
    • Half-life is also defined as the time it takes for half of the original substance to decay away
     email: whysciencetutors@yahoo.com or visit www.sciencetutors.zoomshare.com
  • 8. For more Half-life calculations and other related topics Visit www.sciencetutors.zoomshare.com Or  email: whysciencetutors@yahoo.com