The primary radiation hazard associated with an exposure to a cloud containing 133Xe is ________.
1) It is more of an internal radiation hazard than an external radiation hazard.
2) The uptake of X-133 in body fluids.
3) The absorption of Xe-133 into the skin.
4) It is more of an external radiation hazard than an internal radiation hazard.
5) The uptake of Xe-133 in the thyroid.