{TAIL ~ Detecting method} of impurity concentration in crystal, method for producing {HEAD ~ single crystal} and apparatus for the pull up of a single crystal 
{ TAIL ~ Detecting method } of impurity concentration in crystal , method for producing { HEAD ~ single crystal } and apparatus for the pull up of a single crystal
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH