Iodine – 125 is used in permanent low dose radiation brachytherapy. Radioactive pellets filled with iodine are permanently implanted into the prostate cancer patient’s prostate gland. Iodine has a longer half life than palladium-103 which is the other substance used in LDR brachytherapy. Iodine emits lower levels of radioactive energy but gives off energy for longer than the palladium.
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