How can one have a few grams of deuterium in their body from the time of Big Bang? And how does it make its way in one's body?
Some of the hydrogen in the world around us is deuterium, again mostly from the big bang. When your body was assembled, and when you drink water/breathe, some of the generally-hydrogen sites in our bodies happen, instead, to be deuterated.
In very rare cases most of the energy might also be carried away by the neutrino that is produced as well, so decay to hydrogen is not impossible in a vacuum.
Hence, there is far too much energy released for the electron to stay bound in essentially any case. If the neutrino carries away all the energy (with momentum conservation soaked up mostly by the recoiling proton), it could re-bind, but that process should be exceedingly rare. In that case, the result would see an (excited, probably) hydrogen atom recoiling away from the invisible neutrino.
For example: https://en.wikipedia.org/wiki/Beta_decay
A great place for a reader to begin to reach their own conclusions is here: https://en.wikipedia.org/wiki/Neutron%E2%80%93proton_ratio
Thank you for the correction.
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> And how does it make its way in one's body?
Just like any other element – it’s around, in parts-per-million, and it finds its way in to your cells as a result. It’s just a non-harmful form of hydrogen.
> from the time of Big Bang?
Because that’s where the majority of the deuterium in existence was made. Crazy, but true. Unlike most of the heavier elements, it isn’t a by-product of stellar evolution.
Extraordinary to think that the Universe is almost fourteen thousand million years old, and most of our deuterium was made in the first twenty seconds. After that, it cooled down and just wasn’t hot enough for fusion to do its work.
Physics is mental.
https://www.techtimes.com/articles/56727/20150530/you-are-dr...
And much of the water consumed by plants is turned into carbohydrates which then gets processed back into water after combusting or being oxidized in a animal.
I actually highly doubt that any water remains that has never been broken back into its constituent atoms and then combined with other atoms.
I suspect the true answer is actually 0% of the water remaining today has ever been in a dinosaur. (I.e the atoms might have been, but not the molecule as a molecule.)
Since we have so much heavy elements, our elements are not even from the first generation of stars. AFAIR it’s a third generation of supernovae explosions.