Co-60 Source A very high activity source (>1000Ci) such as Co-60 source, usually in the form of a solid cylinder, discs, or pallets, which produced gamma ray ( 1.2 Mev), used in radiotherapy. Specific activity of cobalt-60 is large enough for SAD of 80cm or even 100cm therefore, isocentric set-up is possible. Isocentric set-up allows movement ...
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