67.下圖為24Na的能譜(energy spectrum),下列何者不存在其中?
(A)photopeak
(B)single escape annihilation peak
(C)coincidence peak
(D)double escape annihilation peak
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統計: A(273), B(484), C(1723), D(435), E(0) #1943647
統計: A(273), B(484), C(1723), D(435), E(0) #1943647
