Difference between revisions of "5-RAD-04"
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==Main Body of Lesson== | ==Main Body of Lesson== | ||
Revision as of 14:28, 2 March 2011
Contents
Outcomes
Specification References
- 7.17 understand that a nucleus of U-235 can be split (process of fission) by collision with a neutron, and that this process releases energy in the form of kinetic energy of the fission products
- 7.18 recall that the fission of U-235 produces two daughter nuclei and a small number of neutrons
- 7.19 understand that a chain reaction can be set up if the neutrons produced by one fission strike other U-235 nuclei
- 7.20 understand the role played by the control rods and moderator when the fission process is used as an energy source to generate electricity
Main Body of Lesson
- Explain in detail how Geiger and Marsden's experiment led to the current structure of the atom:
- most alpha particles going through - empty space between the nucleus and the orbit of electrons; - some alpha particles being deflected - nucleus posivively charged; - alpha particles bounced back - nucleus very dense, carries the whole mass of the atom;
- Introduce pupils to the symbol A¦Z X and define Z and A: Z = atomic number = number of protons inside the nucleus; A = atomic number = number of nucleons inside the nucleus.
- Introduce the three types of radiation and pupils must understand that all three types are emitted when the nucleus is unstable.
- Describe the nature of each type of radiation in terms of:
-what is made of - How is charged - range in air - speed at which it travels at -what stops it (A table containing all info in Science shared)
- use the kit containg all three sources, the Geiger-Muller counter and test them in terms of penetration (what can they be stopped by)
Plenary
- alphs, beta and gamma rays are ionising radiations emitted from unstable nuclei in a random process
Homework
Additional Information
Resources Required
- Geiger-Muller counter
- kit containing alpha, beta and gamma sources
- different materials of different thicknesses
Textbook References
Website References
Skills Addressed
Safety/Hazards
- Don't keep the sources outside their boxex for too long!
