Which type of radioactive decay is this?
Beta
What is a radioactive source injected into the body for a PET scan called?
A tracer
Why will the nurse leave the room when you receive an x-ray.
Using distance to reduce their dose of radiation.
What is the charge on a beta particle?
-1
What did this experiment discover about the atom?
Atoms have a positive nucleus
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
Is the dome built over the destroyed reactor 4 in Chernobyl to prevent contamination or irradiation?
Contamination
The aurora borealis (northern lights) is caused by ionising radiation hitting the atmosphere (True/False)
True
Do you want the half life of a radioactive source in a smoke alarm to be long or short?
long
What are the disadvantages of sending radioactive waste (from nuclear power stations) into space?
Expensive, sometimes the launch goes wrong - rockets can explode
The mass number is the number of?
Protons and Neutrons
Which type of radioactive decay is this?
Gamma
Which Radioactive source type would you find in a smoke alarm? Alpha, Beta or Gamma.
Alpha
Why can Gamma rays be used to treat cancer?
Gamma rays can kill cancer cells inside the body e.g. the brain.
What was missing from Rutherford's model of the atom?
Protons and neutrons, electrons in shells
What is the charge on an alpha particle?
+2
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.
What is the link between evolution and background ionising radiation?
Evolution requires DNA mutations caused by ionising radiation
Why is ionising radiation dangerous?
It can damage, kill or mutate cells causing cancer.
The Earth's magnetic field protects us from ionising radiation from space (solar winds) [True/False]
True
What is the unwanted presence of radioactive material called?
contamination
When an object is exposed to ionising radiation, it has been...
Irradiated
The atomic number is the number of?
Protons in a nucleus.
What is the activity of a radioactive source?
The amount of radiation given off each second.
What is the name of this model of the atom?
The plum pudding model
Which type of radioactive decay is this?
Alpha
Why do astronauts receive a higher dose of radiation than someone on Earth?
The atmosphere absorbs cosmic rays (ionising radiation from space)