7349
This mechanism for particle formation is compared with the mechanism previously reported for the radiolytic formation of gamma - FeOOH nanoparticles .
 Chemical: gamma - FeOOH
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: gamma - FeOOH