Flashcards in Radiation Deck (18):
Name the instrument used to detect radioactivity
What is the process in which unstable atoms emit radiation until they become stable?
What type of radiation can be stopped by a 5mm piece of aluminium?
What type of radiation can be stopped by approximately 1m of air?
What type of radiation can be stopped by approximately 5cm of air?
Which type of radiation is least ionising?
What type of radiation is most ionising?
What type of radiation can be stopped by a thick sheet of lead?
In order of most to least penetrating radiation we have
Gamma, Beta, Alpha
What is the most penetrating type of radiation?
When does radioactive decay occur?
When the nucleus of the isotope is unstable
What type of radiation can be stopped by a piece of paper?
The activity of a radioactive source in the number of unstable atoms in the source that decay per second (Bq)
The average time taken for the count rate (the number of parent atoms) to fall by half is always the same. The time is called half-life.
two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, they also have a difference in relative atomic mass.
The emission of an alpha particle (2 protons, 2 neutrons) from an unstable atom. (4 : 2)
The emission of fast moving electrons from the nucleus.
A neutron in the unstable nucleus decays and forms a proton and an electron