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A radioactive sample is kept at the center of a large evacuated sphere. How safe will it be? |
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Answer» For safety, the radiations α, β and γ emitted by the radioactive sample should not come out of the sphere, αparticles have a less penetrating power and therefore, the walls of the sphere easily stop them. β-particles will not he stopped by the walls and there will be no absorption of β particles inside the sphere as the air has been withdrawn from it. The number of β particles reaching per unit area at the surface of sphere will depend on the radius of sphere. This number will be reduced to 1/4, if the radius is doubled. So some safety is obtained if the sphere is large. γ-radiations are also not absorbed by the walls.Thus for safety, the container should have lead walls and it should not be evacuated. The air will help in absorbing the radiations.Thus for safety, the container should have lead walls and it should not be evacuated. The air will help in absorbing the radiations. |
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