there must be some reasons why they did that, understanding lightning..
u never know what their intention are..asyik asyik nak kutuk je..

why they need to x ray machine?

"But scientists still not completely understand how that spark begins as electrical fields that have been measured in clouds seem too small account for it. And they do not yet understand  whether X-rays actually play a role in how a lightning bolt forms and travels."

u can figure out this?

the x-ray machine use in hospital generate x-ray to pass through human body and create x-ray image on detector. this experiment only need detect the x-ray generate by the lightning itself.