Contamination and Irradiation OALH

Do Now

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1.What is the half-life of a radioactive isotope?

The time it takes for the count rate from a sample to fall to half its initial level

The time taken for the half of the atom to decay

The time it takes for the number of nuclei of the isotope to half

Time taken for the nucleus to decrease in size by half

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2. What happens to the half-life of a particular isotope as more and more nuclei decay?

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3. What are the units for activity? (1

A

V

Bq

Hz

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4. Name the equipment used to measure count rate.

Thermometer

Scales

pH Scale

Geiger-mullertube

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Write this number to 3 significant figures 5.66391

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Calculate the half-life using the graph

Pause Points

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What is contamination?

1

What is irradiation?

Key Knowledge - LCWC

1

What is radioactive contamination?

1

What affects the level of the hazard from contamination?

1

What is irradiation?

1

Does an irradiated object because radioactive?

1

What is radioactive contamination?

1

What affects the level of the hazard from contamination?

1

What is irradiation?

1

Does an irradiated object because radioactive?

Recall Quiz

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1. What is radioactive contamination?

(a) unwanted presence of materials containing radioactive atoms on other materials

(b) exposing objects to nuclear radiation making them radioactive

(c) wanted presence of materials containing radioactive atoms on other materials

(d) exposing objects to nuclear radiation but not making them radioactive

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2. What affects the level of hazard from contamination?

(a) how much it has been irradiated

(b) the type of radiation emitted

(c) the volume of material present

(d) the radioactive decay of contaminated atoms

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3) What is irradiation?

(a) process of exposing an object to nuclear radiation

(b) unwanted presence of materials containing radioactive atoms on other materials

(c) when a material emits radioactive decay

(d) when radiation causing ionisation of materials surrounding it

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4) When do seemingly non-radioactive materials emit radiation?

(a) Only when they have been contaminated

(b) Only when they have been irradiated

(c) When they have been both contaminated and irradiated

(d) Materials are not radioactive when contaminated or irradiated

I Do

1

I do:
Explain why a contaminated object is more dangerous than an irradiated object

We Do

1

We do:
Explain why a contaminated object with a half-life of 4500 million years is more dangerous than an object with half-life 30 minutes. Write down the correct three words

You Do

1

You do:
Explain why a contaminated object emitting gamma radiation is more dangerous than once emitting alpha radiation.

1

You Do – How can you protect yourself from the dangers of radiation?

Plenary

1

1. What is the words for unwanted presence of radioactive materials?

Contamination

Irradiation

1

2. What is used to destroy bacteria in food?

Contamination

Irradiation

1

3. What is deliberate or accidental exposure to nuclear radiation?

Contamination

Irradiation

1

4. Which type does not cause an object to become radioactive?

Contamination

Irradiation

1

5. Which type would be caused when there is a disaster in a nuclear power plant?

Contamination

Irradiation

Contamination and Irradiation OALH

1.What is the half-life of a radioactive isotope?

2. What happens to the half-life of a particular isotope as more and more nuclei decay?

3. What are the units for activity? (1

4. Name the equipment used to measure count rate.

Write this number to 3 significant figures 5.66391

Calculate the half-life using the graph

What is contamination?

What is irradiation?

What is radioactive contamination?

What affects the level of the hazard from contamination?

What is irradiation?

Does an irradiated object because radioactive?

What is radioactive contamination?

What affects the level of the hazard from contamination?

What is irradiation?

Does an irradiated object because radioactive?

1. What is radioactive contamination?

2. What affects the level of hazard from contamination?

3) What is irradiation?

4) When do seemingly non-radioactive materials emit radiation?

I do:Explain why a contaminated object is more dangerous than an irradiated object

We do:Explain why a contaminated object with a half-life of 4500 million years is more dangerous than an object with half-life 30 minutes. Write down the correct three words

You do:Explain why a contaminated object emitting gamma radiation is more dangerous than once emitting alpha radiation.

You Do – How can you protect yourself from the dangers of radiation?

1. What is the words for unwanted presence of radioactive materials?

2. What is used to destroy bacteria in food?

3. What is deliberate or accidental exposure to nuclear radiation?

4. Which type does not cause an object to become radioactive?

5. Which type would be caused when there is a disaster in a nuclear power plant?

1.What is the half-life of a radioactive isotope?

2. What happens to the half-life of a particular isotope as more and more nuclei decay?

3. What are the units for activity? (1

4. Name the equipment used to measure count rate.

Write this number to 3 significant figures 5.66391

Calculate the half-life using the graph

What is contamination?

What is irradiation?

What is radioactive contamination?

What affects the level of the hazard from contamination?

What is irradiation?

Does an irradiated object because radioactive?

What is radioactive contamination?

What affects the level of the hazard from contamination?

What is irradiation?

Does an irradiated object because radioactive?

1. What is radioactive contamination?

2. What affects the level of hazard from contamination?

3) What is irradiation?

4) When do seemingly non-radioactive materials emit radiation?

I do:Explain why a contaminated object is more dangerous than an irradiated object

We do:Explain why a contaminated object with a half-life of 4500 million years is more dangerous than an object with half-life 30 minutes. Write down the correct three words

You do:Explain why a contaminated object emitting gamma radiation is more dangerous than once emitting alpha radiation.

You Do – How can you protect yourself from the dangers of radiation?

1. What is the words for unwanted presence of radioactive materials?

2. What is used to destroy bacteria in food?

3. What is deliberate or accidental exposure to nuclear radiation?

4. Which type does not cause an object to become radioactive?

5. Which type would be caused when there is a disaster in a nuclear power plant?

I do:
Explain why a contaminated object is more dangerous than an irradiated object

We do:
Explain why a contaminated object with a half-life of 4500 million years is more dangerous than an object with half-life 30 minutes. Write down the correct three words

You do:
Explain why a contaminated object emitting gamma radiation is more dangerous than once emitting alpha radiation.

I do:
Explain why a contaminated object is more dangerous than an irradiated object

We do:
Explain why a contaminated object with a half-life of 4500 million years is more dangerous than an object with half-life 30 minutes. Write down the correct three words

You do:
Explain why a contaminated object emitting gamma radiation is more dangerous than once emitting alpha radiation.