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The organic polymer PLA was notably more radiation-sensitive than the other materials tested , showing 50 % decrease in Young ’ s Modulus and ultimate tensile strength at order of magnitude lower radiation dose .
 polymer PLA, materials, s, ultimate tensile strength, magnitude, radiation
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:
 polymer PLA, materials, s, ultimate tensile strength, magnitude, radiation