The radiocarbon in our bodies is one of the naturally occurring sources of radiation. Let's see how large a dose we receive.(adsbygoogle = window.adsbygoogle || []).push({}); ^{14}C 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:^{14}_{6}C ------> e^{-}+^{14}_{7}N + v_{e}

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 = mc^{2}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.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Carbon-14 Decay

**Physics Forums | Science Articles, Homework Help, Discussion**