Template-guided interstitial implants: Cs-137 reusable sources as a substitute for Ir-192

J. F. Williamson, T. Seminoff

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Template-guided implantation of rigid steel or plastic guide needles for afterloading of radioactive sources is widely used in the treatment of gynecologic, rectal, and urologic malignant neoplasms. Iridium-192 is used almost universally, despite the high cost per implant, due to its short half-life and limited need for a flexible, trimmable source. A reusable afterloading system containing cesium-137 was developed. Each source has an effective active length of 6.8 cm and is encapsulated at the distal end of a 21-cm-long stainless steel tube. The sources can be afterloaded into the same plastic guide needles normally used for Ir-192 ribbons. Physical and dosimetric aspects of these sources are compared with those of Ir-192, and radiation protection and cost effectiveness are also discussed.

Original languageEnglish
Pages (from-to)265-269
Number of pages5
Issue number1
StatePublished - 1987


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