character: Prof. Alan Brown
topic: Physics of X-ray production
grade: 11
subject: Physics
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character: Dr. Lisa Chen
topic: Interactions of X-rays with matter
grade: 11
subject: Physics
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character: Mr. David Smith
topic: Applications of X-ray technology in medicine
grade: 11
subject: Physics
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character: Mrs. Sarah Johnson
topic: History of X-ray discovery
grade: 11
subject: Physics
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