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1. The problem statement, all variables and given/known data

Determine the minimum energy that a proton must have to penetrate 30 cm of tissue, the approximate thickness of the human body.

2. Relevant equations

I used R=[(E/9.29)^1.8]1.11x10^-3 but I'm not sure if this is correct.

3. The attempt at a solution

R=[(E/9.29)^1.8]1.11x10^-3

30 cm=3 mm

3mm=[(E/9.29)^1.8]1.11x10^-3, then I divided by 1.11x10^-3 to get 27027.70mm=(E/9.29)^1.8

Then I took a root to the 1.8 power and got 80.64mm=E/9.29

I then multiplied by 9.29 to get 749 mEV.

Seems a bit high. Wasn't sure about units or if I even used the correct formula?

Thanks for your help!

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# Homework Help: Minimum energy a proton must have to penetrate

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