The invention provides a two-step tapered applicator, which can be used to deliver high-dose-rate vaginal brachytherapy to a female patient's vagina post-hysterectomy. In certain embodiments, once inserted through the female patient's vaginal opening (or introitus), the applicator of the invention causes less physical discomfort to the female patient than currently available applicators. In other embodiments, the applicator is used in a female patient whose vaginal apex is larger in diameter than her vaginal introitus.