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