Radiation Flashcards
1
Q
Background radiation sources
A
- cosmic radiation
- radiation from medical sources
- nuclear waste
2
Q
Nuclear model of atom
A
- small positively charged nuclei (atoms bounced back)
- most mass concentrated at the centre
- most of the atom is empty space
- nucleus must be small (few alpha particles repelled)
- nucleus must be positive to deflect alpha
3
Q
Factors of alpha (Rutherford)
A
- faster it’s going, less it will be deflected
- higher charge, more it will be repelled
- closer it is, more it will be repelled
4
Q
Age
A
- known activity when rocks formed
- measure the proportion of gas now
- compare activity to original activity
- determine number of half lives elapsed
- calculate age from reference to half life
5
Q
Beta
A
Electron absorbed by thin metal
6
Q
Alpha
A
Helium ion stopped by paper, skin or few cm in air
7
Q
Gamma
A
EM wave absorbed by thick lead or very thick concrete
