Polarized neutron radiography was used to study the 3D magnetic flux distribution inside of single crystal and polycrystalline Pb cylinders with large (cm 3 ) volume and virtually zero demagnetization.Experiments with single crystals being in the Meissner phase (T

Partially suppressed Meissner effect and magnetic flux trapping in the bulk of poly-crystalline Pb samples with virtually zero demagnetization and large (cm3) volume containing non-superconducting parts could be visualized by polarized neutrons and quantified with respect to the shape and amount of the trapped flux in the intermediate state of lead. These measurements provided a unique look at the macroscopic Quantum mechanics effects and the coexistence of superconducting state, intermediate state, and normal conducting parts in the same sample, respectively.

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