Thereafter {HEAD ~ a radiation device} having {TAIL ~ a radioactive source} therein is inserted into the sheath and detachably connected to a fixing element 
having
Thereafter { HEAD ~ a radiation device } having { TAIL ~ a radioactive source } therein is inserted into the sheath and detachably connected to a fixing element
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH