20 閃爍攝影機每天必做的品管措施 uniformity,合理的狀況下至少應收集多少計數(counts)之γ-ray?
(A) 50k counts
(B) 100k counts
(C) 1,000k counts
(D) 10,000k counts
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統計: A(11), B(46), C(117), D(35), E(0) #1102836
統計: A(11), B(46), C(117), D(35), E(0) #1102836