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The nondestructive X-ray test suggested that the visible porosity within the O-LHAM sample was suppressed by beam oscillation when the periodically oscillated laser keyhole could “ capture ” the bubbles , while the porosity within the LHAM sample reached 24 % .
 X-ray, porosity, sample, beam, laser, porosity, sample
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:
 X-ray, porosity, sample, beam, laser, porosity, sample