53.在相同能量及相同劑量的條件下,下列何種射束對空氣游離腔的離子再結合效應最大?
(A)脈衝掃描射束(pulsed scanning beam)
(B)脈衝射束(pulsed beam)
(C)連續射束(continuous beam)
(D)近接射束(brachytherapy beam)
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統計: A(1377), B(541), C(706), D(154), E(0) #2183187
統計: A(1377), B(541), C(706), D(154), E(0) #2183187