Nuclear Science…Necessary? Identify whether you agree or disagree with each of the following statements. 1.Nuclear power is safe and needed to keep up with our current energy demands. 2.Idaho is a good location for the proposed plants in Twin Falls and on the Payette. 3.Nuclear weapons are necessary for a super-power to maintain their status. 4.Idaho is an ideal location for storing the nuclear waste and the government money received outweighs the risks.
Nuclear Science Bravo – 15,000 kilotons
Daily Dose of Chem Strontium-90, 90 Sr, is formed in nuclear reactors during the explosion of nuclear weapons. It is a radioactive isotope and generates beta particles as it decays. The half-life of strontium-90 is 29 years. If ingested it can cause leukemia and other cancers in humans. Find strontium on a periodic table, and then suggest a reason why some of the strontium- 90 that is absorbed tends to remain in the body for a long time.
Resources Grave of the Fireflies (1988) Five Men at Ground Zero Double Blasted How Far? How Stuff Works? Nuclear Power Plants Crash Course Nuclear Chemistry Part One US Department of Energy Radioisotopes in Space Medical Radioisotopes
Is Nuclear Power Good or Bad? Uranium: Twisting the Dragon’s Tail PBS
Nuclear Symbols Element symbol Mass number (p + + n o ) Atomic number (number of p + )
Types of Radioactive Decay alpha production ( ): helium nucleus beta production ( ): 2 4 He 1 0 e 2+
Alpha Radiation Limited to VERY large nuclei
Beta Radiation Converts a neutron into a proton.
Types of Radioactive Decay gamma ray production ( ): positron production : electron capture: (inner-orbital electron is captured by the nucleus) 1 0 e
Types of Radiation
How Do We Know? Opposite charges_________ each other. Like charges_________ each other. attract repel Deflection of Decay Particles
Nuclear Stability Decay will occur in such a way as to return a nucleus to the band (line) of stability. Iron and its unusual properties
Half-life Concept
Sample Half-Lives
A Deca y Serie s A radioactive nucleus reaches a stable state by a series of steps
Nuclear Fission and Fusion Fusion: Combining two light nuclei to form a heavier, more stable nucleus. Fission: Splitting a heavy nucleus into two nuclei with smaller mass numbers.
Energy and Mass Nuclear changes occur with small but measurable losses of mass. The lost mass is called the mass defect, and is converted to energy according to Einstein’s equation: E = mc 2 m = mass defect E = change in energy c = speed of light Because c 2 is so large, even small amounts of mass are converted to enormous amount of energy.
Fission
Fission Processes A self-sustaining fission process is called a chain reaction.
A Fission Reactor
Fusion – Star Power
Nature takes back over Fukushima podniesinski/?utm_source=facebook&utm_medium=link&utm_campai gn=BPFacebookhttp:// podniesinski/?utm_source=facebook&utm_medium=link&utm_campai gn=BPFacebook Chernobyl