WE HAVE THEM HAND CARRIED TO US FROM THE O.R. ,THEY ARE LABELED WITH A BIOHAZARD STICKER AND RADIATION STICKER, WE HOLD THEM FOR 24 HRS(VERY SHORT HALF LIFE),WE PERIODICALLY HAVE OUR RADIATION OFFICER READ THEM AND MY PA WEARS A DOLCIMETER AND IS MONITORED MONTHLY. DANA