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C.2 <br />
<br />
30 keVβ <br />
<br />
β <br />
<br />
C.2 <br />
30 keV 600 β <br />
<br />
0.8 ◦ <br />
4.3 0.8 ◦ 0.01% ∼0.2%<br />
β <br />
30 keV <br />
<br />
I assume no reflection<br />
at 0.8(deg.) incident angle.<br />
Ion Chamber<br />
Background<br />
30keV Beam<br />
rotation<br />
Mirror<br />
PMT<br />
NaI Scinti.<br />
Incident angle =0.8(deg.)<br />
PMT<br />
C.2: <br />
4 C.3 30 keV <br />
∼ 600 ch ≅ 67 keV <br />
β = 0 ◦ 150 ◦ β = 180 ◦ β = 330 ◦ <br />
β = 240 ◦ 270 ◦ β = 240 ◦ <br />
74