Originally Posted by lalar3

Ionizing radiation, like x-rays, affect the dividing cells of your body: bone marrow (not to be confused with actual bone cells called osteocytes), GI tract, etc. Although your bone is currently dividing to repair its self in your arm, osteocytes are particularly resistant to radiation. That coupled with the fact that you have a cast over your arm, and the x-rays they use (I imagine) are no where near as powerful as medical x-rays, you really have nothing to worry about.

Also, on a side note x-rays pass through things. Therefore, there would be no such xray that only went through the cast and not your entire arm. How else would the photo paper/detector on the other end of the x-ray beam actually see anything? I understand your worries, but really you have nothing to worry about. I think you always have the option for a visual/physical inspection (like you do with film rolls or anything else you don't want xrayed). I think I'd go with the xray, the last thing I'd want is someone poking and picking at my cast, that I believe would be more dangerous than the x-rays.