The advent of monoclonal antibodies has given rise to the possibility of their use as carriers of tumorcidal levels of radiation. The target site—cancerous tissue—is of arbitrary size and location. A tool used for dosimetry must be able to account for the aposteriori definition of these tumor sites. The MABDOS software accomplishes this by performing a simulation of radioactive decay in each of the source organs defined in the standard man model. This solution partitions itself into a number of parallel structures amenable to computation in a true parallel‐processing environment. Implementation of these structures on a multiprocessor platform known as ‘‘the simulation machine’’ is described.

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