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Which type of radioactive decay is this?
Alpha
Which type of radioactive decay is this?
Beta
Which type of radioactive decay is this?
Gamma
What is the minimum material needed to stop Alpha radiation?
Paper / 10cm of air
What is the minimum material needed to stop Beta radiation
Aluminum
What is the minimum material needed to stop gamma radiation?
Thick lead
What was the first sub atomic particle discovered?
The electron
The discovery of the electron lead to which model of the atom?
The plum pudding model
What is the name of this model of the atom?
The plum pudding model
What did this experiment discover about the atom?
Atoms have a positive nucleus
What happens is a positively charge particle comes close to another positively charged particle?
They repel each other
What was missing from Rutherford's model of the atom?
Protons and neutrons, electrons in shells
Who's model of the atom put electrons in shells hold 2,8,8 electrons?
Niels Bohr
What do we call atoms with the same number of protons, but different numbers of neutrons?
Isotopes
The atomic number is the number of?
Protons in a nucleus.
The mass number is the number of?
Protons and Neutrons
The charge on a proton is?
+1
The charge on a neutron is?
0
The charge on an electron is?
-1
When Polonium undergoes alpha decay, it becomes a new element - Lead. [True/False]
True
Why is ionising radiation dangerous?
It can damage, kill or mutate cells causing cancer.
What is the activity of a radioactive source?
The amount of radiation given off each second.
What is the definition for half life?
the time taken for the activity of a radioactive source to reduce by half.
Do you want the half life of a radioactive tracer used for a PET scan to be long or short?
short
Do you want the half life of a radioactive source in a smoke alarm to be long or short?
long
What is the unwanted presence of radioactive material called?
contamination
When an object is exposed to ionising radiation, it has been...
Irradiated
What is the charge on an alpha particle?
+2
What is the charge on a beta particle?
-1
Is the dome built over the destroyed reactor 4 in Chernobyl to prevent contamination or irradiation?
Contamination
What are the disadvantages of sending radioactive waste (from nuclear power stations) into space?
Expensive, sometimes the launch goes wrong - rockets can explode
What is a radioactive source injected into the body for a PET scan called?
A tracer
Which Radioactive source type would you find in a smoke alarm? Alpha, Beta or Gamma.
Alpha
Why are the radioactive isotopes used in medical imaging created in a lab very near to the hospital?
Medical isotopes have a short half life of a few hours.
Why do astronauts receive a higher dose of radiation than someone on Earth?
The atmosphere absorbs cosmic rays (ionising radiation from space)
Why will the nurse leave the room when you receive an x-ray.
Using distance to reduce their dose of radiation.
Why can Gamma rays be used to treat cancer?
Gamma rays can kill cancer cells inside the body e.g. the brain.
What is the link between evolution and background ionising radiation?
Evolution requires DNA mutations caused by ionising radiation
Which would be the most dangerous type of radioactive source to swallow?
Alpha because its the most ionising.
The aurora borealis (northern lights) is caused by ionising radiation hitting the atmosphere (True/False)
True
The Earth's magnetic field protects us from ionising radiation from space (solar winds) [True/False]
True


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