Radioactivity Flashcards
1
Q
How does ionising radiation work?
A
ionise atoms by removing electrons
2
Q
What is an alpha particle?
A
a helium nucleus
3
Q
What is the charge of an alpha particle?
A
+2e
4
Q
What is the range of alpha in air?
A
1-2cm
5
Q
What can alpha be stopped by?
A
sheet of paper
6
Q
What is beta minus?
A
an electron
7
Q
What is the charge of beta minus?
A
-e
8
Q
What is the range of beta minus in air?
A
1-2m
9
Q
What can beta minus be stopped by?
A
1-3mm of aluminium
10
Q
What is beta plus?
A
a positron
11
Q
What is the charge of beta plus?
A
+e
12
Q
How far can beta plus travel in air?
A
not very as positrons get annihilated by electrons
13
Q
What is gamma radiation?
A
EM wave
14
Q
What is the range of gamma in air?
A
kilometers
15
Q
What can gamma photons be stopped by?
A
few cm of lead