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Adenosine Triphosphate ( ATP ) bioluminescence technology is a rapid , user-friendly method of quantifying surface cleanliness and was used in this study to gather quantitative data on levels of contamination on AM materials at three different stage processes : post build , post cleaning and post sterilization .
 technology, surface, quantitative data, AM materials, processes, build, cleaning
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 technology, surface, quantitative data, AM materials, processes, build, cleaning