Here, we choose a set of random numbers uniformly distributed between 0 and to establish values for . We shall focus upon one of these random numbers, . Thus,

Given this , we then choose another ``independent'' random number,
.
If is less than or equal to the probability of emission at angle
, then we * accept* the emission, otherwise we * reject* the
emission and repeat the process.
Thus, we accept the emission if and only if:

where is proportional to the probability of emission at angle . We repeat the above process until we have established directions for all particles to be emitted.

The above is an inefficient method for achieving emissions because
when the emission is * rejected* the work is wasted.