60.圖為何種射源所形成的矢狀面等劑量分布曲線？ 
(A)Ra-226（Dumbbell）
(B)I-125（Model 6711）
(C)Pd-103（seed）
(D)I-125（Model 6702）

Palladium-103

¹⁰³Pd seeds have recentlynbecome available for use in brachytherapy. Their clinical applications arensimilar to those of ¹²⁵I. Having a shorter half-life (17 days) than thatnof ¹²⁵I (59.4 days), ¹⁰³Pd may providena biologic advantage in permanent implants because the dose is delivered at anmuch faster rate (22).

The palladium-103nseed model 200³ consists of a laser-welded titanium tube containing twongraphite pallets plated with ¹⁰³Pd (Fig. 15.5).nA lead marker between the pallets provides radiographic identification.

以上引用自: https://radiologykey.com/brachytherapy-4/