• Define radioisotopes Define radioisotopes • Types of natural radiationsTypes of natural radiations (1) (1) aphpa decayaphpa decay , , (2) (2) beta — decaybeta — decay , , (3) (3) beta + decaybeta + decay , , External linkExternal link (4) (4) gamma radiation gamma radiation (not a particle) (not a particle) Online resourcesOnline resources• Comparison of natural radiationsComparison of natural radiations• Explanation of Reference Explanation of Reference Table OTable O, Symbols , Symbols

used in Nuclear Chemistryused in Nuclear Chemistry

• Read and write a report on nuclear Read and write a report on nuclear medicine (at least one page) medicine (at least one page) Due DateDue Date

• References :References :

(1) (1) Radioisotopes in medicineRadioisotopes in medicine

(2) (2) Nuclear medicineNuclear medicine

Further reading: Further reading: (1) (1) and and (2)(2)

(3) (3) Are mobile phones dangerous?Are mobile phones dangerous?

(4) Lesson Webpage(4) Lesson Webpage

What is a radioisotope?What is a radioisotope?• In a In a stablestable element, the element, the number of protonsnumber of protons and and

the the number of neutronsnumber of neutrons are are equalequal. . • When the number of neutrons When the number of neutrons does not equaldoes not equal the the

number of protons ,it can become an number of protons ,it can become an unstable unstable nucleusnucleus..

• As the As the unstable nucleus changes, it gives off unstable nucleus changes, it gives off radiation and is said to be radioactiveradiation and is said to be radioactive.. Radioactive Radioactive isotopes are often called isotopes are often called radioisotopesradioisotopes. .

• All elements with atomic numbers All elements with atomic numbers greater than 83greater than 83 are radioisotopes ; these elements have are radioisotopes ; these elements have no stable no stable nucleinuclei and are radioactive. and are radioactive.