Our lab has received a request from a researcher to process, embed, and cut some kidney blocks which have been infused with "Iodine 125".  The gamma counter reads from .5-1.0 MRI/HR, and the background is .04.  We do not presently work with any radioactive tissue (other than SLN), so this is completely unknown territory.  Could anyone help us out with the precautions this would involve, and how we would dispose of the solutions used--or if the processor will become contaminated??  Any help would be greatly appreciated!!  Jen