A further object of the invention is to provide {TAIL ~ such a system} in which {HEAD ~ the at least one radioactive element} is semi permanently positioned in the hollow closed end needle 
in
A further object of the invention is to provide { TAIL ~ such a system } in which { HEAD ~ the at least one radioactive element } is semi permanently positioned in the hollow closed end needle
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH