The radiologic
skeletal survey is most useful tool for detecting occult trauma fractures in children
younger than 2 years old. A current policy states that skeletal survey is
mandatory in all cases of suspected child abuse because younger
children are easier to lift, shake, throw, pull and fall. Moreover, occult fractures can be detected by bone scan
though; bone scan is not specific for fracture but still most useful in
detecting occult rib fractures.
Well, nitrogen is the gas that makes up 78% of the earth's atmosphere.
I would guess its in the air that we breathe. I am not really sure. Just basing this answer off of research.
