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