Column of Water Length
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Column of Water Needed to Cut Photon Count in Half at 10 MeV
e -n σ t
e -n σ t
[math]n = \frac{atoms}{cm ^{3}} =\gt \frac{ \frac{g}{cm^{2}} }{ \frac{g}{mol}} \times 6.022 \cdot 10^{23} \frac{atoms}{mol} =\gt \frac{atoms}{cm^{3}}[/math]