A 4 mm diameter of the cylindrical source 60 of Co is used in Cobalt-60 Unit. If the source to diaphragm distance is 40 cm and the source to surface distance is 1 m, the penumbra at 60 cm depth is (mm)
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Cobalt-60 sources are available in 1.5 cm and 2 cm diameters. The pneumatically driven linear source drawer on the GammaBeam™ 100-80 moves the source between the fully shielded and the fully exposed positions.
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