Radiation

Common Core Connection Objectives Today I will be able to: Differentiate between the composition and materials required to shield alpha, beta and gamma emissions. Identify practical uses for alpha, beta and gamma emissions. Write balanced alpha and beta decay equations. Informal assessment – monitoring student questions and interactions as they complete the radioactive particles chart and the decay equation practice Formal assessment – analyzing student responses to the warm up, online polls and closure Common Core Connection Build Strong Content Knowledge Use technology and digital media strategically and capably Reason abstractly and quantitatively Look for and make use of structure Make sense of problem and persevere in solving them

Lesson Sequence Evaluate: Warm Up (5 min) Engage/ Explore: Radiation Introduction Polls (5 min) Informal assessment of student prior knowledge Explain: Radioactive Particles Chart (10-15 min) Elaborate: Radioactive Particles Chart Discussion (10 min) Informal assessment of students questions and responses Explain: Writing Decay Equations (10 min) Elaborate: Decay Equation Practice (1o min) Informal assessment of student questions and responses Engage/Elaborate: Compute your Own Radiation Dose (Time Permitting –(5 min) Evaluate: Closure (3 min) Formal assessment of meeting the objectives

Warm Up What is radioactivity? What is the difference between fission and fusion? Is radioactivity an example of fission or fusion Where is nuclear energy produced?

Objectives Today I will be able to: Differentiate between the composition and materials required to shield alpha, beta and gamma emissions. Identify practical uses for alpha, beta and gamma emissions. Write balanced alpha and beta decay equations.

Homework Begin studying for your Unit 3 Exam on Tuesday, October 14 Topics: Atomic Structure History of the Atom Radioactivity Complete the alpha and beta decay practice problems worksheet

Agenda Warm Up Radioactive Particles Chart Radioactive Particles Chart Discussion Writing Decay Equations Decay Equation Practice Extension: Compute your Own Radiation Dose Closure

There are 3 main types of radiation that produce energy Alpha Beta Gamma Today you will research the three types of radiation

Task: Complete the Radioactive Particles Chart Use Chapter 4 p. 122 – 125 in the textbook to complete the chart Use your electronic device to research how the radiation can be blocked and practical uses.

We will review the information filled in on the chart as a class. Chart Discussion Alpha Decay Animation - https://www.youtube.com/watch?v=T92V4YtS5x0

Radiation Symbol Charge Composition Is shielded or stopped by? Alpha Beta Gamma

Is shielded or stopped by? Radiation Symbol Charge Composition Is shielded or stopped by? Alpha 2+ Charge 2 p+ and 2 n0 Beta -1 Charge Stream of high speed e- Gamma No Charge Very high energy electromagnetic radiation

Is shielded or stopped by? Radiation Composition & Symbol Is shielded or stopped by? Alpha 2+ Charge 2 p+ and 2 n0 paper Beta -1 Charge Stream of high speed e- Clothing, wood Gamma No Charge Very high energy electromagnetic radiation Concrete, lead

Shielding Radiation , aluminum Which type of radiation is the most penetrating? gamma rays Which type of radiation do you think is most dangerous? gamma rays Sun glasses have UVA and UVB protection. The UV-A stand for ultra violet alpha particles and the UV-B stands for ultra violet beta particles. Almost all sunglasses offer 100% UVA protection. Be sure to get 100% UVB protection as well.

We can represent the energy emitted during radioactive decay using a decay equation

What are the pieces of a radioactive decay equation? Radioactive Particle Symbol New Decay Product Unstable Isotope

Alpha Decay Equation Example The Calvert Cliff’s nuclear power plant uses Uranium – 235. Write the alpha decay equation

Beta Decay Equation Example The radioisotope yttrium-90 is used in cancer treatments. Write the beta decay equation.

Gamma Radiation Example Gamma radiation is emitted from Uranium 235 at the nuclear power plant. Write an equation representing the gamma energy emitted.

Task: Complete the Decay Equation Practice at your desk

Task: Complete the “Compute Your Own Radiation Dose” worksheet at your desk

Compute Your Own Radiation Analysis What quantity of radiation are you exposed to per year? What does this mean? No evidence of cancer occurring <10,000 mrem exposure Body has time to repair cells when exposed to low concentrations of radiation Correlation has been found with cancer and radiation exposure >50,000 mrem

Exit Ticket What are 2 things you learned today? What is one question you may still have about radiation?