a main equipment including an optical system for performing {HEAD ~ an X ray analysis} of a sample, the optical system comprising an X ray source, an X ray detector, and optical parts therebetween that are classified into a plurality of categories so that {TAIL ~ the optical parts} installed in the main equipment are exchangeable with other optical parts belonging to the same category 
a main equipment including an optical system for performing { HEAD ~ an X ray analysis } of a sample , the optical system comprising an X ray source , an X ray detector , and optical parts therebetween that are classified into a plurality of categories so that { TAIL ~ the optical parts } installed in the main equipment are exchangeable with other optical parts belonging to the same category
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH