§4 Working with gamma radiation

1 / 16
suivant
Slide 1: Diapositive
NatuurkundeMiddelbare schoolhavoLeerjaar 3

Cette leçon contient 16 diapositives, avec quiz interactifs et diapositives de texte.

Éléments de cette leçon

Slide 1 - Diapositive

Learning objectives
  • You can describe what the terms 'radioactivity' and 'half-life' mean.
  • You can calculate the activity of a substance after N half-lives.
  • You can determine the half-life from a graph of the activity against time.
  • You can describe the three types of radiation that are emitted by radiactive substances.
  • You can describe the penetrating power of the various types of radiation.
  • You can describe how medical research is carried out using gamma radiation.
  • You can explain the difference between contamination and irradiation and how they are applied.  

Slide 2 - Diapositive

Little radiation has fallen on the black part of an X-ray.
A
Correct
B
Incorrect

Slide 3 - Quiz

You can describe what radioactivity is.
Radioactive substance
Ionising radiation
Radioactive radiation
Radioactive = emits radiation
Radioactive substance or ionising radiation

Slide 4 - Diapositive

Naturally radioactive
1 hour in the Fukushima disaster area is equivalent to eating 104 bananas.
After 1896 we learned to develop artificially radioactive substances.
Brazil nuts are known to contain small amounts of radium, a naturally radioactive substance.

Slide 5 - Diapositive

Background radiation in the NL

Slide 6 - Diapositive

You can calculate the activity over time.
You can determine the half-life from a decay curve.
The amount of radiation from a radioactive source with a half-life of 50 minutes.

Slide 7 - Diapositive

Exponential decay curve

Slide 8 - Diapositive

Radioactive iodine has a half-life of 8 days.

After how many days is there less than 1.0% left of the original amount of radiation?
A
40
B
56
C
48
D
64

Slide 9 - Quiz

You can describe three types of radiation that radioactive substances can emit.
Three kinds of radiation

Slide 10 - Diapositive

You can describe the penetrating power of the various types of radiation.

Slide 11 - Diapositive

You can describe research with gamma rays.
Examinations using gamma radiation
  • Making tracer
  • Injecting tracer
  • registering radiation
  • analysing image of the organ 
A tracer is made in the laboratory
The tracer is injected in the body of the patient
The gamma camera registers the release of radiation
A false-colour image of a thyroid gland.

Slide 12 - Diapositive

You can explain the difference between irradiation and contamination
Irradiation and contamination
Contamination
Contamination
irradiation

Slide 13 - Diapositive

Irradiation
contamination

Slide 14 - Diapositive

Protection
A container for transporting radioactive substances. The inner and outer walls are made of steel. Between them is a thick layer of lead.
You must wear a protective suit when taking samples of water that may potentially be radioactively contaminated.

Slide 15 - Diapositive

What types of particle radiation are emitted by radioactive materials?

Slide 16 - Question ouverte