45475
Gadolinium oxyorthosilicate ( GdSiO , GSO ; usually doped by 0.1 – 1.0 % of Ce ) is a single crystal that is used as a scintillator in medical imaging such as positron emission tomography or for detecting neutrons .
 location: Ce
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Ce 
Answer:
 location: Ce