How should I go about using equation 8.18? Link can be found below. In the book, an example is used where Th-220 --> C-12 + Po-208 with a Q value of 32.1 MeV is used, and it is said to yield t1/2 = 2.3x106 but for the life of me I cannot reproduce this result. This is what I did: Going from left to right in the equation, -for a/c i used (1.25*2201/3 x10^-12 m ) / (3x10^8 m/s) -for V0 I used 35 MeV which was also given -for mc^2 I used amu * 931.5 MeV/(amu * c^2) -for h-bar * c i used ( 6.582x10^-10 MeV * s ) * (3x10^8 m/s) -for z i used 6 -for Z' i used 84 -for 1/(4πε0) i used 8.988x10^9 Nm^2/c^2 I used all SI units except for my MeV which cancel. But I keep getting an overflow error in my Ti-84 Plus. What could be wrong?