23377
They produced the Np isotope ( half-life = 2.4 days ) by bombarding uranium with slow neutrons .
 location: Np
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: Np 
Answer:
 location: Np