(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

How much energy does an alpha particle need to penetrate the minimal protective epidermal layer of skin (Thickness ~7 mg cm^{-2}

2. Relevant equations

Possibly R=0.56E, E,4

OR R=1.24E-2.62, 4<E<8

3. The attempt at a solution

I used the equation R=0.56E

so, I said that:

7 mg/cm^2=0.56E

then divided by 0.56 to get E=12.mEV

I guess I'm jsut not sure if I used to correct equation and am confused if the units match up.

Thanks for your help!

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Radiation HW on Alpha Particles

**Physics Forums | Science Articles, Homework Help, Discussion**