69707
Today , promethium is still recovered from the byproducts of uranium fission ; it can also be produced by bombarding Nd with neutrons , turning it into Nd which decays into Pm through beta decay with a half-life of 11 days .
 Nd
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nd