radioactive decay n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Radioactive Decay PowerPoint Presentation
Download Presentation
Radioactive Decay

Loading in 2 Seconds...

play fullscreen
1 / 7

Radioactive Decay - PowerPoint PPT Presentation


  • 181 Views
  • Uploaded on

Radioactive Decay. Types of Radioactive Decay. Alpha Decay : nucleus eject an alpha particle (made of 2 protons and 2 neutrons – a helium nucleus) Can be shielded by a piece of paper Beta Decay : nucleus emits an electron or positron (electron with positive charge)

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Radioactive Decay' - laurel


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
types of radioactive decay
Types of Radioactive Decay
  • Alpha Decay: nucleus eject an alpha particle (made of 2 protons and 2 neutrons – a helium nucleus)
    • Can be shielded by a piece of paper
  • Beta Decay: nucleus emits an electron or positron (electron with positive charge)
    • Can be shielded by aluminum foil
  • Gamma Decay: nucleus emits highly energetic photons
    • Can be shielded by several centimeters of lead
half life
Half-Life
  • The half-life of a radioisotope is the time required for one half of the atoms in a sample to degrade into a more stable material
  • The half-life for a given isotope is always the same
  • Half-lives vary from isotope to isotope, ranging from fractions of a second to millions of years
half lives
Half-Lives
  • Ex: The half-life of Strogenium is 2 seconds. How much of a 10 g sample will be left after 6 seconds?

6 seconds x = 3 half-lives

  • After 0 half-lives, 10 g are left.
  • After 1 half-life, 5 g are left.
  • After 2 half-lives, 2.5 g are left.
  • After 3 half-lives, 1.25 g are left.

1 half-life

2 seconds

practice problems
Practice Problems
  • The half-life of radon-222 is 4.0 days. How much of a 100 g sample is left after 16.0 days?
  • Cesium-137 has a half-life of 30 years. If 4.0 g of cesium-137 disintegrates over a period of 90 years, how many grams would remain?
  • What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g in 33 seconds?
  • How old is a bone if it presently contains 5.0 g of carbon-14, but was estimated to originally contain 80.0 g of carbon-14? The half-life of carbon-14 is 5,730 years.

6.25 g

0.5 g

11 s

22,920 years

practice problem
Practice Problem

Pd-100 has a half-life of 3.6 days. If there are 6.02 x 1023 atoms at the start, how many atoms would be present after 20.0 days?