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