Polonium-210 goes to lead-206 in, for ten points, what radioactive decay consisting of the emission of a helium nucleus?
Applying tunnelling theory to the nuclear Coulomb barrier yields a prediction for how the emitted particle's energy depends on the half-life.  For this process, the emitted particle's angular momentum equals the spin difference of the parent and daughter since its spin is zero.  Polonium-210 goes to lead-206 in, for ten points, what radioactive decay consisting of the emission of a helium nucleus?
Applying tunnelling theory to the nuclear Coulomb barrier yields a prediction for how the emitted particle's energy depends on the half-life.  
alpha decay (prompt on radioactive decay, but accept proton radioactivity until "equals")