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Fission products Many artificial radionuclide s of technological importance are produced as fission products within nuclear reactor s. A fission product is a nucleus with approximately half the mass of a uranium or plutonium nucleus which is left over after such a nucleus has been " split " in a nuclear fission reaction .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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