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## Homework Statement

A gamma ray from

^{198}Au incident normally on a thick aluminum slab travels 1.45 cm before it undergoes a Compton scattering. Calculate the range of angles through which the gamma could scatter and still have at least a 10% probability of re-emerging from the incident slab surface without undergoing another interaction.

## Homework Equations

the mass attenuation coefficient for Al at 1.5 cm is .05 MeV

E

_{[tex]\gamma[/tex]}' = E

_{y}/ [1 + (E

_{[tex]\gamma[/tex]}/E

_{0}) (1-cos[tex]\vartheta[/tex])

## The Attempt at a Solution

IIn the chart of the nuclides do I use one of the gamma energies or is this even the first formula I should be using?