Does rapid burial increase exposure to oxygen?

yes but very little exposure

Explanation:

a gentle burial also increases an organisms chances of becoming more fossil like

YES

Explanation:

Organisms decompose more quickly when they are in contact with oxygen. Most environments exposed to the open air are in contact with plenty of oxygen, so the soft tissues of dead organisms, whether plants or animals, decay quickly. ... For an organism to become a fossil, it must not decompose or be eaten.

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.