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100 ch 400 ch <br />
<br />
C.4 β §C.1 <br />
600 900 200 <br />
900/3=300 200 ∼ 1.3 × 10 6 0.02%<br />
β <br />
<br />
200 200(sec.)/600(sec.)∼ 1/3 <br />
<br />
<br />
Background<br />
hist<br />
Entries 1018<br />
Mean 388.5<br />
RMS 200.7<br />
1000<br />
800<br />
Counts<br />
600<br />
400<br />
200<br />
0<br />
0 200 400 600 800 1000<br />
ADC channel<br />
C.3: β <br />
150 ◦ , 330 ◦ , 270 ◦ , 240 ◦<br />
75