[Plutonium239]

This question has been confusing me for a while, so I hope someone will be able to help out with a decent answer.

If one has an disk-shaped alpha source about the size of the flat head of a thumbtack, and this is directed at a 1-inch diameter sphere of beryllium from a distance of 0mm (meaning contact), with the source directly above the beryllium, is there a specific direction in which the neutrons will be emitted?

Any help would be much obliged.

Thanks,
Plutonium239

[Mitch]

It'll likely depend on its kinematics. Energy conservation laws apply.

[GEOELECTRONICS]

The neutrons will exit isotropically.

Geo