radioactivity Flashcards
what is the radius of an atom
1 x 10^-10 meters
what is the radius of a nucleus compared to the radius of an atom?
nucleus is 1/10000 of the radius of atom
what is an alpha particle?
2 protons and 2 neutrons
what is the relative charge of an alpha particle?
+2
what is the ionising power of an alpha
high
what is the range of an alpha particle through the air
stopped by 5cm of air
what is the penetration of alpha particle
stopped by 0.5mm of paper
what is a beta particle
an electron
what is the relative charge of a beta particle
-1
what is the range of an beta particle in air
1m of air
what is the ionising power of a beta particle
medium
what is the penetration of a beta particle through material
0.5cm of aluminium
what is a gamma ray
high energy electromagnetic radiation
what is the charge of a gamma ray
no charge
what is the ionising power of a gamma ray
low
what is the range of a gamma ray through air
infinite in air
what is the penetration of gamma ray through materials
intensity is halved by 10cm of lead
