The mass difference between two isotopes is sometimes just a neutronmass. The spectrometer should separate them very well. For such anisotope combination, the difference in radius should be around 1 cm. Thatis r -n = 1 em. In order to achieve this, choose a magnetic field with amagnitude in Tesla (maximum magnetic field you can obtain from aconventional magnet is around 2.5 T so be far away from this value) andchoose the direction also. Then determine the velocity of isotope you need.Last calculate radius r of a Pbjos smallest isotope.

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