Gemini «7 describe the composition, mass and charge of α-, β- and γ-radiations (both β– (electrons) and β+ (positrons) are included) 8 understand that an antiparticle has the same mass but opposite charge to the corresponding particle, and that a positron is the antiparticle of an electron 9 state that (electron) antineutrinos are produced during β– decay and (electron) neutrinos are produced during β+ decay 10 understand that α-particles have discrete energies but that β-particles have a continuous range of energies because (anti)neutrinos are emitted in β-decay 11 represent α- and β-decay by a radioactive decay equation of the form 238 92U T «» 234 90 h + 2 4α 12 use the unified atomic mass unit (u) as a unit of mass»