"isotope" - key terms from Wikipedia

carbon isotope	fractionation
common isotope
darmstadtium isotope
electromagnetic isotope	separation
fissile isotope
heavy isotope
isotope
isotope	cartridges
isotope	effect
isotope	ratio
isotope	ratio mass
isotope	separation
isotope	signatures
laser isotope	separation
most stable isotope
new isotope
one stable isotope
operation isotope
oxygen isotope	ratio
parent isotope
stable isotope