Fraction of incident photons penetrate both sheets

Reference no: EM13543620

A pencil beam of 200-keV photons is normally incident on a 1.4-cm-thick sheet of aluminum pressed against a 2-mm- thick sheet of lead behind it.

1. What fraction of the incident photons penetrate both sheets without interacting?

2. What would be the difference if the photons came from the other direction, entering to lead first and then the aluminum?

Reference no: EM13543620

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