What are visual particle dedectors?

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i have a presentation for nuclear course, but i can't find in any resources about visual dedectors. there are many types but none specific topics. can anyone give me an example to study on?
 
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A simple example (and probably the best) is known as a cloud chamber. It was developed by a scientist named Charles Wilson. He won the Nobel Prize in Physics for it in 1927. Should be a good place to start - here's a link to the presentation speech for his award and for that of a contemporary whose theories were confirmed by the new method.
 
thanks timmay, i was really desperate about it. i will check the information.
 
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