2. What happens to the half-life of a particular isotope as more and more nuclei decay?
Question 3
3.
Question 4
4.
Question 5
5.
Write this number to 3 significant figures 5.66391
Question 6
6.
Calculate the half-life using the graph
Pause Points
Question 7
7.
What is contamination?
Question 8
8.
What is irradiation?
Key Knowledge - LCWC
Question 9
9.
What is radioactive contamination?
Question 10
10.
What affects the level of the hazard from contamination?
Question 11
11.
What is irradiation?
Question 12
12.
Does an irradiated object because radioactive?
Question 13
13.
What is radioactive contamination?
Question 14
14.
What affects the level of the hazard from contamination?
Question 15
15.
What is irradiation?
Question 16
16.
Does an irradiated object because radioactive?
Recall Quiz
Question 17
17.
Question 18
18.
Question 19
19.
Question 20
20.
I Do
Question 21
21.
I do:
Explain why a contaminated object is more dangerous than an irradiated object
We Do
Question 22
22.
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
Question 23
23.
You do:
Explain why a contaminated object emitting gamma radiation is more dangerous than once emitting alpha radiation.
Question 24
24.
You Do – How can you protect yourself from the dangers of radiation?
Plenary
Question 25
25.
Question 26
26.
Question 27
27.
Question 28
28.
Question 29
29.
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
3. What are the units for activity? (1
A
V
Bq
Hz
4. Name the equipment used to measure count rate.
Thermometer
Scales
pH Scale
Geiger-mullertube
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
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
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
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
1. What is the words for unwanted presence of radioactive materials?
Contamination
Irradiation
2. What is used to destroy bacteria in food?
Contamination
Irradiation
3. What is deliberate or accidental exposure to nuclear radiation?
Contamination
Irradiation
4. Which type does not cause an object to become radioactive?
Contamination
Irradiation
5. Which type would be caused when there is a disaster in a nuclear power plant?