Friday Sept 19 Objective: Estimate the yearly radiation exposure of various people of different backgrounds. Checkpoint: – What is the half-life of 99.

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Presentation transcript:

Friday Sept 19 Objective: Estimate the yearly radiation exposure of various people of different backgrounds. Checkpoint: – What is the half-life of 99 Tc if a 500 gram sample decays to 62.5 grams in 333 years? – Fill in the missing particle. What type of decay is this? Homework: – Half life and Nuclear Decay worksheet due Monday – Source B (Health Effects of Radiation) due Wed/Thurs.

AmountTime 500 g 250 g 125 g 62.5 g 333 years Half-life = 111 years / 3

Tc 97 e 0 Mo 97 Fill in the missing particle. What type of decay is this? Electron Capture

Is Nuclear Technology Worth It? Source A: Radium Girls

Is Nuclear Technology Worth It? Source B: Health Effects of Radiation

Source B: Health Effects of Radiation

The story so far… Nuclear Chemistry: When one element turns into another element

The story so far… Atoms like a 1:1 ratio of protons and neutrons (equal number of both)

The story so far… Decay Rate: How long will it take for half of a sample to decay HALF LIFE

What is radiation? The story so far…

How much radiation are we exposed to?

Stamp today

Find your new partner (and their name) Alpha Decay Beta Decay Gamma Decay Positron Emission Electron Capture

What are some things you have heard of that might be radioactive?

Radiation Exposure: Case Studies

Type of Radiation Amount of daily dose (include units) Total yearly dose (include units)

Type of Radiation Amount of daily dose (include units) Total yearly dose (include units) Eating one banana

Type of Radiation Amount of daily dose (include units) Total yearly dose (include units) Eating one banana0.1 uSv

Type of Radiation Amount of daily dose (include units) Total yearly dose (include units) Eating one banana0.1 uSv36.5 uSv

Type of Radiation Amount of daily dose (include units) Total yearly dose (include units) Eating one banana0.1 uSv36.5 uSv Living in a brick house

Type of Radiation Amount of daily dose (include units) Total yearly dose (include units) Eating one banana0.1 uSv36.5 uSv Living in a brick house 70 uSv

Type of Radiation Amount of daily dose (include units) Total yearly dose (include units) Eating one banana0.1 uSv36.5 uSv Living in a brick house 70 uSv Total yearly exposure = uSv

Work time playlist 1.Radiation Exposure Activity 2.Finish Half-Life / Nuclear Decay worksheet (due Monday) 3.Read Source B and fill out online graphic organizer (due Wed/Thurs)

Exit Ticket (not for a grade) 1) 2) The half life of potassium-40 is 5 days. How long will it take for a 100 gram sample to decay to 25 grams? 3) Which of the following statements applies to you? a) I understand nuclear chemistry very well. b) I understand it somewhat. c) I’m lost and could use some help.

Friday: Values Talk Compassion Integrity Responsibility Courage Respect Curiosity

10 items that are radioactive