After {HEAD ~ a predetermined period} of {TAIL ~ time}, the radiation device is disconnected from the fixing element and removed from the body 
of
After { HEAD ~ a predetermined period } of { TAIL ~ time } , the radiation device is disconnected from the fixing element and removed from the body
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH