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7.2 – half life
daughter isotope | decay curve | half life | parent isotope | radiocarbon dating
half life and radiocarbon dating
• half life - amount of time it takes for an isotope to become half of its value
• radiocarbon dating - measuring the age of an object by the amount of carbon 14 remaining
• A machine called accelerator mass spectrometer is used for radiocarbon dating
decay curves
• decay curve - curved line on a graph that shows the rate the radioisotope decays at
• every decay curve looks the same, only the half life would differ depending on the isotope
Decay curve for mercury-209
parent and daughter isotopes
• Daughter isotope - stable product of radioactive decay
• Parent isotope - the isotope going through radioactive decay
Common isotope pairs
arc reactor making:
•http://www.youtube.com/watch?v=4OUKPuRX9Ek
Suit first flight :
• http://www.youtube.com/watch?v=ZwOxM0-byvc
7.3 – nuclear reactions
chain reaction | fission | fusion | nuclear equation | nuclear reaction
fission
• Fission - split of bigger nucleus into smaller nuclei | energy | subatomic particles [ protons | electrons | neutrons ]
• The power released from fission is used to power our current lifestyles
nuclear reactions + equations
• Nuclear equation - equation demonstrating radioactive decay [ temperature | density | pressure ]
• Nuclear reaction - a process a nucleus goes through when loosing or gaining particles \ energy
Quick guide to writing nuclear
equations
writing nuclear equations:-sum of mass stays the same on both sides-sum of charges stays the same
chain reactions• Chain reaction - an event in which one reaction initiates another
Uranium-235
chain reaction
CANDU reactor
• “ canadian deuterium uranium ” reactor• one of most safe in the world• produces heat using :
diagram of CANDU reactor
fusion• Fusion - 2 low
mass nuclei coming together to form a bigger nucleus
- the arc reactor uses fusion to power itself
- arc reactor supposedly relies on a Pd-103/Pd-107 radio-isotopic decay cell to produce electrical current
the sun’s
fusion process
video explaining how the arc reactor works:
• https://www.youtube.com/watch?v=h_i5pmyVxb8
Cool article:
• http://www.huffingtonpost.com/quora/what-is-the-theoryconcept_b_3456241.html