Radioactivity Flashcards
Alpha
Cannot penetrate paper. 2 protons+2 neutrons. Most ionising.
Beta
A fast moving electron. Middle ionising and can penetrate up to aluminium.
Gamma
An electromagnetic wave. Least ionising. Can penetrate up to lead and partially through it.
When does radioactive decay occur?
When the nucleus of an isotope is unstable
Which type of radiation is the least ionising?
Gamma
What type of radiation can be stopped by a piece of paper?
Alpha
Which of these is not a method for safely handling radioactive materials?
Picking it up using your hands
What type of radiation can be stopped by a 5 mm piece of aluminium?
Beta radiation
Name the most penetrating type of radiation.
Gamma
What type of radiation can be stopped by a approximately 1 m of air?
Beta
What type of radiation can be stopped by a approximately 5 cm of air?
Alpha
Name the instrument used to detect radioactivity.
Geiger counter
What type of radiation can be stopped by a thick lead sheet?
Gamma
Which type of radiation is the most ionising?
Alpha
_______________ is the process by which unstable atoms emit radiation until they become stable.
Radioactive decay
