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7.1 Source Module

A specified source of radiation may either be given as (1) a specified incident distribution in space, energy, angle, and time or (2) as a known source of radiation that is emitting a specified amount of radiation as a function of time, space, energy, and angle. Although it is possible to show that these are mathematically equivalent [CdHP], the actual implementation of these ``sources'' into a Monte Carlo code will depend on which type of source is being examined.

In order to specify an incident flux of particles on a surface, one needs to determine the following quantities: