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Radioactivity

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DC Physics

on 15 March 2016

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Transcript of Radioactivity

Structure of the Atom
7.4 understand that alpha and beta particles and gamma rays are ionising radiations emitted from unstable nuclei in a random process

7.5 describe the nature of alpha and beta particles and gamma rays and recall that they may be distinguished in terms of penetrating power

7.6 describe the effects on the atomic and mass numbers of a nucleus of the emission of each of the three main types of radiation

7.7 understand how to complete balanced nuclear equations

Ionisation and Absorption
7.1 use the following units: becquerel (Bq), centimetre (cm), hour (h), minute (min), second (s).

7.8 understand that ionising radiations can be detected using a photographic film or a Geiger-Muller detector

7.9 recall the sources of background radiation

7.13 describe the uses of radioactivity in medical and non-medical tracers, in radiotherapy and in the radioactive dating of archaeological specimens and rocks

7.14 describe the dangers of ionising radiations, including:
• radiation can cause mutations in living organisms
• radiation can damage cells and tissue
• the problems arising in the disposal of radioactive waste.

Rutherford Model of the Atom
Marie Curie & Radium
Radioactivity
Yr 10

The lessons...
Properties, Atom & Half-life
Uses, Fisson & Fusion
Revision
Kraftwerk - Radioactivity
http://goo.gl/RKu7wN
6 Experiments that changed the world - Radium
Part I
Part II
Part III
How damaging is radiation?
The most radioactive place on earth
Radiation versus radioactive atom
Types of radiation
http://waowen.screaming.net/revision/nuclear/rsanim.htm
Rutherford Animation
Higher Energy Collisions
7.15 describe the results of Geiger and Marsden’s experiments with gold foil and alpha particles

7.16 describe Rutherford’s nuclear model of the atom and how it accounts for the results of Geiger and Marsden’s experiment and understand the factors (charge and speed) which affect the deflection of alpha particles by a nucleus

Types of Radiation
Half Life
Fission and Fusion
7.2 describe the structure of an atom in terms of protons, neutrons and electrons and use symbols to describe particular nuclei

7.3 understand the terms atomic (proton) number, mass (nucleon) number and isotope

ANS
Mouse Trap Fission
7.10 understand that the activity of a radioactive source decreases over a period of time and is measured in becquerels

7.11 recall the term ‘half-life’ and understand that it is different for different radioactive isotopes

7.12 use the concept of half-life to carry out simple calculations on activity

ANS
ANS
ANS
7.17 understand that a nucleus of U-235 can be split (the 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.

ALPHA DECAY
BETA DECAY
Decay of Dice Practical:
http://goo.gl/uNxkvK
What makes something stable?
From 'In Search of Giants' video
Atoms & the Periodic Table
From 'In Search of Giants' video
Discovery of the Electron
From 'In Search of Giants' video
Discovery of the atom
Melvyn Bragg, In Our Time: The Curies
http://goo.gl/121EN4


Finding the half life of Barium-137
Results:
http://goo.gl/RnxLBV
Uses of Radioactivity
Radioactive Waste

The first Nuclear Reactor
History of weapons testing
Full transcript