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