In brachytherapy, what does the term "active length" refer to?

In brachytherapy, "active length" specifically refers to the portion of the radiotherapy source that emits radiation. This measurement is crucial because it determines the extent of the radiation effects in the targeted tissue. The active length influences the dose distribution within the treatment area and helps ensure that the prescribed dose is accurately delivered to the tumor while minimizing exposure to surrounding healthy tissues. Proper understanding of the active length allows medical professionals to optimize treatment plans and achieve the desired therapeutic outcomes.

Understanding this term is vital in the context of brachytherapy procedures, where precise placement of radioactive sources is essential for effective treatment.