The ANSWERS software service has developed a tetrahedral mesh import capability for the shielding and criticality Monte Carlo codes MONK and MCBEND. The purpose is to provide a means to import CAD geometries that have been converted to a tetrahedral mesh using a meshing program. The speed of the calculation is not dependent on the mesh size and is only 5 to 50% slower than the equivalent model using the solid body geometry package of MONK and MCBEND. This paper investigates the accuracy of the method which using realistically complex models has shown a 5 - 10% variation in the results of MCBEND calculations from an equivalent solid body geometry model. The investigation concludes that the differences can be attributed to the approximation of primitive bodies by tetrahedra.
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