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