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Moved from technical forums, missing template

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

t

Going from left to right in the equation,

-for a/c i used (1.25*220

-for V

-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?

Th-220 --> C-12 + Po-208 with a Q value of 32.1 MeV is used, and it is said to yield

t

_{1/2}= 2.3x10^{6}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*220

^{1/3}x10^-12 m ) / (3x10^8 m/s)-for V

_{0}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?