Iodine-125 (¹²⁵I) in the form of titanium-encapsulated cylindrical seeds has been used quite extensively within the past decade to give a tumoricidal radiation equivalent dose for:

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Iodine-125 seeds are commonly used for internal radiation therapy for prostate cancer that has not spread outside of the prostate gland. The seeds are implanted directly into the prostate tissue, allowing for localized radiation therapy. Iodine-125 is a low-energy radioisotope that emits a type of radiation called gamma rays, which can penetrate only a short distance into tissue. This means that the radiation mostly affects the cells near the seeds and does less damage to surrounding healthy tissue.

Iodine-125 (¹²⁵I) in the Form of Titanium-Encapsulated Cylindrical Seeds Has