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The History of Radiation
Transcript of The History of Radiation
Characterized and named alpha particle, beta particle, and proton. Discovered how to calculate the decay of radioactive substances. Works Cited "BBC - GCSE Bitesize: The Structure of an Atom." BBC - Homepage. Web. 04 Apr. 2011. <http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/atomic/atomstrucrev1.shtml>.
"GCSE Nuclear Radiation: Types of Radioactivity." Andy Darvill's Science Site: Home. Web. 03 Apr. 2011. <http://www.darvill.clara.net/nucrad/types.htm>.
"Radioactivity: Historical Figures." Access Excellence @ the National Health Museum. Web. 04 Apr. 2011. <http://www.accessexcellence.org/AE/AEC/CC/historical_background.php>.
"Three Types of Radiation - Alpha, Beta, Gamma." Black Cat Systems - Macintosh Software. Web. 04 Apr. 2011. <http://www.blackcatsystems.com/GM/experiments/ex7.html>.
"What Is Radiation?" Health Physics Society. Web. 04 Apr. 2011. <http://hps.org/publicinformation/ate/faqs/whatisradiation.html>.
"Why Are Some Atoms Radioactive | Radiation Protection | US EPA." US Environmental Protection Agency. Web. 04 Apr. 2011. <http://www.epa.gov/rpdweb00/understand/radiation.html>. What is Radiation? Radiation is the releasing of energy as electromagnetic waves or as moving subatomic particles.
Types of radiation of nonionizing radiation are Light, radio, and microwaves. Others can produce charged particles (ions) in matter - ionizing radiation. Ionizing radiation is created by unstable atoms. Unstable atoms are different from stable atoms in that they have an excess amounts of energy or mass (or both).
In order for an atom to be categorized as radioactive it must have an unstable nuclei. In order to gain stability, these atoms give off the excess energy or mass. These emission are called radiation. Three types of radiation
When an unstable nucleus decays, there are three ways that this can happen. It can emit either an alpha particle, a beta particle or a gamma ray. alpha Alpha particles are made of 2 protons and 2 neutrons.
This means that they have a charge or +2, and a mass of 4- the atomic number decreases by two when it decays.
beta Beta particles have a charge of minus 1.
Beta particles ionise atoms that they pass, but not as strongly as alpha particles do.
When a nucleus emits a beta particle: the atomic mass is unchanged. The atomic number increases by 1. gamma Gama rays are waves, not particles.
This means that they have no mass and no charge.
Gama emission isn't 'radioactive decay' because it doesn't change the state of the nucleus- it carries away some energy. pictures 1,2,3 - http://www.darvill.clara.net/nucrad/types.htm picture 4 - http://larnedfamilychiropractic.org/images/Wilhelm_Roentgen.jpghttp:// picture 5 - www.rtstudents.com/radiology/images/antione-henri-becquerel.jpg picture 6 - http://imaginesciencefilms.com/wp-content/uploads/2009/10/curie_filmmakerfund.jpg picture 7 - http://cascience6.wikispaces.com/file/view/Ernest-Rutherford.png/89839249/Ernest-Rutherford.png