The Types dimension of the Radioisotopes for Nuclear Medicine Diagnosis and Treatment market classifies isotopes according to decay characteristics and clinical utility, forming a detailed market taxonomy. Diagnostic isotopes such as Technetium‑99m, Fluorine‑18, and Gallium‑68 dominate imaging workflows; their short half‑lives and gamma or positron emissions enable high‑resolution scans while limiting patient radiation exposure, collectively sustaining the diagnostic revenue stream. Therapeutic isotopes—including Iodine‑131, Lutetium‑177, and Yttrium‑90—exhibit beta or alpha emissions suitable for targeted radiotherapy, underpinning the treatment segment’s financial contribution. A hybrid class, theranostic isotopes (e.g., Gallium‑68/Lutetium‑177 pairs), bridges diagnosis and therapy, fostering integrated care pathways. Each isotope subtype influences market dynamics through production complexity, regulatory pathways, and reimbursement structures, thereby shaping the overall market size and informing strategic investment decisions.