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3<br />
X<br />
X X <br />
∼10 keV ∼10 keV X <br />
X X <br />
<br />
<br />
3.1 <br />
3.1.1 <br />
1 X <br />
X <br />
<br />
X ñ X <br />
ñ <br />
ñ = n − ik = 1 − δ − ik (3.1)<br />
n k δ k <br />
<br />
δ = r eN A<br />
2π<br />
k = r eN A<br />
2π<br />
ρ<br />
A λ2 f 1 (3.2)<br />
ρ<br />
A λ2 f 2 = λ<br />
4π µ (3.3)<br />
r e 2.818×10 −13 cmN A 6.022×10 23 <br />
λ X cmA ρ g/cm 3 µ cm −1 <br />
f 1 f 2 f f X <br />
<br />
f = f 0 + ∆f ′ + i∆f ′′ (3.4)<br />
∆f ′ ∆f ′′ Z f 0 = Z <br />
f 1 f 2 <br />
f 1 = Z + ∆f ′ , f 2 = ∆f ′′ (3.5)<br />
f 1 f 2 <br />
f 1 ∼ Z 3.1 3.2 Pt<br />
1112 5 keV f 1 =77<br />
9