22564
Simultaneous detection of six different ion species in SIMS , including secondary electrons , was used to generate ion ratio images whose signal intensity values could be correlated to composition through the use of calibration curves from standard samples .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None