The radiocarbon in our bodies is one of the naturally occurring sources of radiation. Let's see how large a dose we receive. 14C decays via B- emission, and 18.0% of our body's mass is carbon. a) Write out the decay scheme of carbon-14 and show the end product. (A neutrino is also produced.) answer: 146C ------> e- + 147N + ve b) Neglecting the effects of the neutrino, how much kinetic energy (in MeV ) is released per decay? The atomic mass of C-14 is 14.003242 u. No idea where to begin tried using E = mc2 did not get the right answer. c) How many grams of carbon are there in a 76.0 kg person? no idea how to do this. d) How many decays per second does this carbon produce? (Hint: Assume activity of C-14 is about 0.255 Bq per gram of carbon.) No idea about this one either. Any help would be greatly appreciated.