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Whats the use of lead plate in Rutherfords scattering experiment?

April 26, 2017Chemistry experiment lead Mathematics plate rutherford scattering

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Whats the use of lead plate in Rutherfords scattering experiment?

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The lead plate is used to produce a straight beam of alpha particles to fall on the gold foil.It also prevents the excess alpha rays from escaping from the system and damaging the surroundings.

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The Radioactive substance used in the experiment is kept in the Lead box.Lead has a very high density and Alpha,beta particles cannot penetrate through it(lead).This helps to concentrate the beam of this particles towards the gold foil.Also this particles if penetrate through body,it may destroy the DNA and contribute to the effect of carcinogenicity.So,for this reason Lead plate box of sufficient thickness is used in this experiment.