問題詳情

53.用於後荷式近接治療的192Ir射源種粒，射源長度與直徑大小約為：
(A) 0.3 mm × 0.5 mm
(B)3 mm × 0.5 mm
(C)3 mm × 5 mm
(D)30 mm × 5 mm

參考答案

答案：B
難度：困難0.307692
統計：A(11),B(8),C(3),D(2),E(0)

用户評論

【用戶】Steven Huang

【年級】大四上

【評論內容】出處：放射治療物理學 5/e p.313 D. Iridium-192Iridium-192 (alloy of 30% Ir and 70% Pt) sources are fabricated in the form of thin flexible wires that can be cut to desired lengths. Nylon ribbons containing iridium seeds 3 mm long and 0.5 mm in diameter（長 3mm，寬 0.5mm）, spaced with their centers 1 cm apart, are also commonly used. Both the wires and the seed ribbons are quite suitable for the afterloading technique (14,15) (see Section 15.6B).