Are you prepared?. http://www.youtube.com/watch?v=vZAJbJc1ayc start 2:27. Renewable or Non-Renewable?. What is Radiation?. Uranium 92 U 238.02891. How many protons? How many electrons? How many neutrons?. 6 C Carbon 12.011. 92 protons 92 electrons 146 neutrons. What is Radiation?.
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http://www.youtube.com/watch?v=vZAJbJc1ayc start 2:27
What is Radiation?
How many protons?
How many electrons?
How many neutrons?
360 millirem/year or
Effects of Radiation
Emit small amounts of ionizing radiation
Stored 100-500 years
19401970: put in steel drums, dumped in ocean (still UK & Pakistan)
1970+: gov’t run landfills
Sun and stars, some weapons
2 small (light) isotopes are forced together
H + H = He
Need temps > 100,000,000ºC
Releases more E than fission
437 commercial reactors in 32 countries, producing 17% electricity
a controlled nuclear fission chain reaction
produce high-pressure steam
that turns turbines
which turns generator and creates electricity.
Controlled Nuclear Fission Reaction
Pressurized Water Reactor
Boiling Water Reactor
Where nuclear fission occurs.
Surrounded by thick concrete, steel & lead.
Blocks all radiation!
35,000 – 70,000 fuel rods
3% Uranium-235 pellets
In water (moderator)
absorb extra neutrons
Control the chain reaction
Life span of a power plant = 15-40 years
Parts wear out, Fuel is spent
Plant is shut down
Highly radioactive for 240,000 years
Must store for 10 times the half-life
What can we do with them?
= time needed for one-half of the nuclei in a radioisotope to decay and emit their radiation to form a stable isotope
Uranium 235710 million yrsalpha, gamma
Plutonium 23924,000 yrsalpha, gamma