1493
The rear silver liquid chamber was threefold thick to 17 MeV protons in water and it efficiently produced either 13N by the 16O ( p , alpha ) 13N reaction or [ 18F ] fluoride ion by the 18O ( p , n ) 18F reaction .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities:  
Answer:
 None