1. NUCLEAR CHANGES What is Radioactivity?

2. What happens when an element undergoes radioactive decay? During radioactive decay an unstable nuclei of an isotope emits particles and releases energy, to become a stable isotope. To radiate means “to give off” “NUCLEAR”

3. http://www.ndt-ed.org/EducationResources/HighSchool/Radiography/stableunstableatoms.htm UNSTABLE NUCLEI

4. Isotopes of an element are atoms that have the same number of protons but different numbers of neutrons in their nuclei http://www.efda.org/multimedia/downloads/animations/Hi-De-Tri.swf

5. RADIATION Nuclear Radiation A release of energy and particles from the nucleus of an atom Electromagnetic Radiation Energy given off by an atom due to an acceleration of the atoms electrons

6. Materials undergoing radioactive decay are changing! AND – Materials that get bombarded with nuclear radiation are affects

7. There are 4 types of nuclear radiation 1.Alpha particles 2.Beta particles 3.Gamma rays 4.nuetrinos

8. The alpha particle 1.Positively charged 2.Helium nuclei 3.More massive than other nuclear radiation types

9. The beta particle 1.Travels farther through matter than the heavy alpha particle 2.Fast moving electrons/positrons 3.Can pass through paper 4.Will be stopped by 3 mm of aluminum

10. The gamma ray High energy electromagnetic radiation

11. Nuclear decay Nuclear deacy causes changes in the nucleus of an atom