Each source emits S neutrons/sec. The flux distribution at a point $(x, y)$ due to a single source at $(x_0, y_0)$ is given by:
$\phi(x, y) = \frac{S}{4\pi D} \frac{1}{\sqrt{(x - x_0)^2 + (y - y_0)^2}}$
The flux distribution due to two sources is the sum of the
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