The therapeutic application involves the placement of a pellet of radioactive material near a tumour D. brachytherapy, Thus, option "D" is correct.
The difference between Teletherapy and Brachytherapy is that Teletherapy is radiotherapy using a source of ionizing radiation at some distance from the patient, usually, tens of centimetres while Brachytherapy is radiotherapy using radioactive sources positioned within (or close to) the treatment volume.
Thus, option "D" is correct.
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