Radium is a radioactive element found in small amounts in soil and rocks.
Radium is a natural source of radioactivity. What is the general name for the natural radioactivity always present in our environment?
A background radiation B chain reaction C radioactive dating D radiotherapy
There are two sources of alpha radiation:
The alpha particles from the inhaled radon gas are a much greater risk to health than the alpha particles from the sealed radium source. Explain why.
Radium-226 and Radium-224 are both isotopes of radium.
A nucleus of Radium-226 has 88 protons. How many protons are there in a nucleus of Radium-224?
A 88 B less than 88 C more than 88 D none
A nucleus of Radium-226 has 138 neutrons. How many neutrons are there in a nucleus of Radium-224?
A 88 B 136 C 138 D 224
The graph shows how the activity of a sample of a radioactive isotope changes with time.
Complete the graph by adding the missing unit for activity.
Explain what is meant by the term half-life.
Use the graph to find a value for the half-life of this isotope.
