Consider a point source emitting 10^12 neutrons/s in a vacuum. Calculate the flux and the current at a distance of 1 m from the source.

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Flux is the amount of particles per second per unit area.
Since we have a point source, we can assume that the neutrons are emitted isotropically,
That is, their density on a spherical shell around the source is constant.

The surface area of a spherical shell is:

S = 4(pi)r^2

And in our case r = lm, ...

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